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000-911 System and Administration: Informix Dynamic Server

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000-911 exam Dumps Source : System and Administration: Informix Dynamic Server

Test Code : 000-911
Test Name : System and Administration: Informix Dynamic Server
Vendor Name : IBM
: 142 Real Questions

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IBM System and Administration: Informix

IBM and AGS Announce Availability of recent options for Informix Dynamic Server | killexams.com Real Questions and Pass4sure dumps

supply: IBM

July 05, 2007 12:00 ET

New Server Studio and Sentinel R. 6.1 to permit quick Adoption of IDS 11 "Cheetah"

ARMONK, ny and ny, big apple--(Marketwire - July 5, 2007) - IBM (NYSE: IBM) and AGS Ltd., a privately held purveyor of management solutions for facts servers, these days introduced that the new Server Studio and Sentinel R. 6.1 -- the essential suite of integrated gadget administration equipment for IBM Informix Dynamic Server (IDS) -- is now accessible, with variants offered by means of both IBM and AGS.

The IDS statistics server is a strategic point of IBM's information management application portfolio and the these days announced IDS 11 -- code named Cheetah -- delivers multiplied efficiency, reliability and scalability, together with the means to address huge volumes of advanced statistics at very excessive speeds. IDS eleven is additionally the business's first data server to deliver clustered data centers with continual facts availability and catastrophe healing despite the geographic area or distance between backup statistics middle websites.

Server Studio and Sentinel together kind a magnificent infrastructure of multi-platform equipment that assist both pro database professionals and beginners alike manage IBM Informix facts server environments with an unheard of ease and productiveness. Native help of IDS 11 new performance within the liberate 6.1 of Server Studio and Sentinel further enhances ability to deliver most efficient efficiency, availability and maintainability of Informix databases during their whole operational existence cycle.

"Our long-term partnership with AGS underscores IBM's steadfast commitment to offering IDS customers with the performance optimization, availability and compliance administration solutions they need," referred to Bernie Spang, director IBM statistics servers. "the new liberate 6.1 of Server Studio and Sentinel will aid offer protection to the funding that their shoppers have made of their Informix statistics server infrastructures."

the flexibility, rich performance and ease-of-use provided through Server Studio and Sentinel construct on the legendary reliability and easy administration of IDS. the brand new tool set provided by using AGS helps businesses and companies make sure that crucial database purposes remain up and perform at height ranges, enabling them to conveniently control alternate, handle regulatory compliance and guarantee availability of essential enterprise tips.

bank of the usa currently chosen Server Studio and Sentinel for its IDS environment -- one of the most world's largest disbursed data facilities processing on-line fiscal transactions.

"The latest free up of Server Studio and Sentinel give a group of built-in, highly productive device management tools that developers and DBAs working with IBM's Informix records servers have been traumatic and awaiting. Informix now has very powerful graphical equipment that exceed the capabilities of native and third celebration offerings purchasable for any other database platform. Couple this with spectacular technical help and also you get items with incredible price and a short ROI," pointed out Kevin Kleinhomer, vice chairman at financial institution of the usa. "In their enormous distributed environment, Server Studio and Sentinel have simplified and automated many DBA tasks. With these additions, IBM's Informix information servers have been made greatly simpler to manage and monitor."

Server Studio gives a finished assortment of effortless-to-use, proven tools for DBAs and developers that increase efficiency of performing average database projects similar to: SQL construction and debugging, schema management, configuration auditing and change management, performance tuning, information storage management and reorganization, safety administration and extra -- all from an built-in graphical console that unites construction, administration and protection actions for a whole Informix infrastructure at a principal element of manage.

Sentinel provides 24 × 7 operational monitoring, alerting, concern discovery, analysis and autonomic response automation infrastructure for IBM Informix statistics servers' ambiance. it be easy to deploy agent-much less structure equips DBAs with sophisticated diagnostics and remediation facilities which aid pinpoint and unravel the underlying explanations of performance bottlenecks and elements competition issues that adversely have an effect on databases' availability and influence end clients.

Smaller businesses and businesses that would not have significant IT staffs to manipulate colossal information servers infrastructure have additionally benefited from the mighty application construction and administration capabilities offered by means of IDS and Server Studio.

"As a software developer and DBA, Server Studio is a device that i take advantage of day by day, and it's exactly what I demand from my tools -- good, legit, and strong," mentioned Sean Durity, manager of IT for CornerCap investment information. "Even the 'small' elements of Server Studio are huge timesavers. I cannot think about working with Informix and not the use of Server Studio. I may not work with anything less."

the relationship between AGS and IBM all started in 2000 when IBM all started distributing AGS' Server Studio as the fundamental database building and administration equipment suite with Informix data servers. Product management, engineering and QA teams of both agencies work intently on product direction, know-how construction and QA checking out of Server Studio and Sentinel.

"we are pleased with and significantly price their strategic partnership with IBM. option of AGS facts servers' management solutions by using IBM is a testament to their industry-leading know-how," noted Anatole Vishon, CEO of AGS Ltd. "We consider the a must-have magnitude of Informix, particularly in the retail, fiscal, telecommunications, healthcare, govt and SMB sectors. AGS is committed to supporting existing capabilities and establishing new technologies for Informix facts servers so as to add price for IBM shoppers."

Pricing and Availability

The liberate 6.1 of Server Studio and Sentinel can be found now through IBM and AGS international. The Core edition of Server Studio is equipped by means of IBM to Informix customers at no further charge. Its fundamental functionality will also be extended by means of buy of numerous top rate versions obtainable without delay from AGS.

additional information about Server Studio is accessible at: http://www.ibm.com/utility/statistics/informix/serverstudio/, or http://www.serverstudio.com/items/serverstudio/

more information about Sentinel is available at: http://www.ibm.com/software/facts/informix/sentinel/, or http://www.serverstudio.com/products/sentinel/

additional information about Informix Dynamic Server is available at: http://www.ibm.com/application/information/informix/ids/

AGS, Server Studio and Sentinel are logos or registered logos of superior international programs, Ltd. For an inventory of extra AGS trademarks, please see http://www.ags.com

IBM, Informix Dynamic Server and the IBM e-enterprise emblem are emblems or registered emblems of overseas enterprise Machines service provider. For a list of extra IBM trademarks, please see www.ibm.com/legal/copytrade.shtml

All different company, product or provider names may be trademarks or registered logos of others. Statements regarding IBM's future building plans and schedules are made for planning applications most effective, and are area to exchange or withdrawal devoid of be aware. Reseller fees may additionally fluctuate.


Fleet administration Market to Surpass US$ fifty one Billion Globally by 2024 | killexams.com Real Questions and Pass4sure dumps

Feb 18, 2019 (Heraldkeeper by way of COMTEX) -- long island, February 19, 2019: The fleet administration market is expected to attain US$ fifty one.5 Billion by means of 2024; growing to be at a CAGR of greater than 23.50% in the given forecast period.

this may stop any false messing with them. it's going to likewise compose a proper help plan.within the feeling of fleet administration, monitoring a car has two implications. The simple magnitude is preserving full and an accurate record of every thing which concerns that car, from gasoline stops to any upkeep, whether it’s a driver fitting an extra fan belt out and about in a disaster or a full administration. here's simple so peculiarities may also be diagnosed and wondered. The 2nd significance basically is aware of the place cars are. This responsibility has been made plenty simpler since the innovation of GPS and discharging it for open use.

Fleet Managements project is a set of responsibilities which is required to maintain fleet of vehicles working effectively. The principal accountability of any fleet administrator is to grasp what is truly in their fleet at any given time. this could no longer best just implies that the fleet administrator should have a checklist of all motors moreover but also may still have in an ideal world that they must have a checklist of the entire serial portions of the diverse key elements which establish with each and every of their vehicles.

Browse Full record: https://www.marketresearchengine.com/reportdetails/fleet-administration-market-file

The Fleet management Market has been segmented as beneath:

The Fleet management Market is segmented on the groundwork of answer type, Deployment type, carrier class, Connectivity category, Vertical analysis and Regional analysis. by using solution classification this market is segmented on the groundwork of Driver management, Asset administration and Operation administration.

by Deployment type this market is segmented on the basis of Hybrid, On premises and Cloud. via provider category this market is segmented on the foundation of Managed functions, Integration and deployment carrier and Managed capabilities. by means of Connectivity classification this market is segmented on the foundation of mobile device and satellite tv for pc device.

via Vertical analysis this market is segmented on the groundwork of construction, RetailEnergy and utilities, Transportation and logistics, govt and Manufacturing. by way of Regional analysis this market is segmented on the groundwork of North the usa, EuropeAPAC and leisure of the area.

This report offers:

1) an overview of the world marketplace for fleet management and linked applied sciences.2) Analyses of global market trends, with information from 2015, estimates for 2016 and 2017, and projections of compound annual boom costs (CAGRs) via 2022.three) determine the brand new market alternatives and targeted promotional plans for fleet administration.four) discussion of research and building, and the demand for brand spanking new items and new purposes on the facts purchasable.5) finished business profiles of predominant players in the trade to explore further viable gains.

Request pattern document from right here: https://www.marketresearchengine.com/reportdetails/fleet-management-market-record

desk of Contents

1 INTRODUCTION

2 research Methodology

3 govt summary

four premium Insights

4.1 appealing Market opportunities in the Market4.2 Market with the aid of solution, 2016-20214.3 Fleet management Market: proper capabilities and Solutions4.four Lifecycle analysis, by means of Region4.5 Market funding scenario

5 Fleet administration Market Overview

6 industry trends

7 Fleet administration Market evaluation, by using Deployment class

8 Fleet administration Market analysis, by means of solution

9 Fleet management Market analysis, via Connectivity technology

10 Fleet administration Market analysis, with the aid of provider

eleven Fleet administration Market evaluation, by Vertical

12 Geographic analysis

13 competitive landscape

14 business Profiles

14.1 Introduction

14.2 AT&T, Inc.

14.3 Cisco techniques, Inc.

14.4 Fleetmatics group PLC

14.5 IBM organization

14.6 Verizon Communications, Inc.

14.7 I.D. methods, Inc.

14.eight Trimble Navigation restrained

14.9 Telogis

14.10 Zonar methods

14.11 Workwave LLC

different related Market analysis experiences:

international Fish Finder device Market Key avid gamers, Share, developments, sales, Segmentation and Forecast through 2023

circulate Battery Market measurement is Projected to be round US$ 1.09 Billion by way of 2024

Media Contact

enterprise identify: Market analysis Engine

Contact grownup: John Bay

electronic mail:john@marketresearchengine.com

mobilephone: +1-855-984-1862

country: u.s.

web site: https://www.marketresearchengine.com/


IBM delivers next-technology DB2 8.2 Database | killexams.com Real Questions and Pass4sure dumps

IBM supplies next-technology DB2 eight.2 Database

large Blue also discloses plans to integrate its DB2 and Informix Dynamix Server product lines in future types of both products

  • by using Stephen Swoyer
  • 09/14/2004
  • IBM Corp. final week formally introduced the next unlock of its DB2 commonplace Database (UDB) edition eight.2, formerly code-named “Stinger.”

    IBM introduced the first beta of Stinger remaining fall, followed in can also by means of a public beta preview. The ensuing DB2 eight.2 database—packing a bevy of efficiency and availability points, together with new autonomic capabilities—will become often attainable this Friday.

    For the list, large Blue last delivered an enormous DB2 UDB replace (edition eight.1) in November 2002—just weeks after it kicked off its eBusiness-On-Demand computing method.

    In light of IBM’s constant emphasis on utility or “on-demand” computing, then, it’s now not surprising that officials had been anxious to tout the autonomic credentials of the new database. “These [autonomic] capabilities are via a long way the leading factor [of the DB2 8.2 release],” says Jeff Jones, director of approach for IBM’s data management options. “The concept is that with these [autonomic] capabilities, fewer DBA elements are required, and the DBA is allowed to do other things, like probably participate greater at design time, like greater order detective work.”

    Jones says that the revamped database will make it less demanding for DBAs to install, configure, keep, and optimize DB2 databases on the fly. during this appreciate, officers factor to superior types of tools such as DB2 Configuration marketing consultant and DB2 Design guide, which provide DBAs a wizard-like interface to customise DB2 for different application and information warehousing necessities. Configuration marketing consultant, for example, asks questions on what type of utility a DBA plans to roll out and the way many clients she expects to assist, after which tunes DB2 for this reason.

    similarly, the new Design advisor lets DBAs extra simply tune DB2 because the database workload alterations, automate adjustments to the database constitution, and perform tasks such as database backup and restoration. Jones says it may well be specially helpful in complicated-query environments.

    one of the vital largest new features in the revamped DB2 is in keeping with expertise IBM developed for its gaining knowledge of Optimization (LEO) analysis and building venture. in line with Jones, LEO helps to automate, simplify, and accelerate queries without requiring a DBA’s attention. The LEO technology additionally offers up-to-date query facts about database use, storage, and efficiency.

    nonetheless a different new characteristic is what IBM calls query Patroller, which introduces a query-based chargeback facility. “It lets you really computer screen [and] take note the charge of queries, so you can do things like chargeback. you can basically calculate how a great deal query time these departments are the use of and charge them for it,” mentioned Paul Rivot, global director of database servers at IBM, in an interview this may.

    in other places, DB2 8.2 boasts a new characteristic called Autonomic Object preservation that automatically performs administration and upkeep features, corresponding to table alterations or facts backups.

    in all probability fantastically, IBM’s DB2 eight.2 unencumber borrows heavily from applied sciences already blanketed within the Informix Dynamix Server, the thing-relational information shop IBM obtained with the purchase of Informix in 2001. for example, says Jones, the new edition of DB2 aspects a ability referred to as Autonomic excessive-Availability-catastrophe-restoration (HADR) with autonomic client reroute, which supports computerized excessive-availability, catastrophe healing and customer reroute for clustered environments.

    “We’re hugely automating the assignment of developing failover pairs, lower back up methods, to fail to when a prime gadget dies,” he explains. “This became doable in the past with DB2, but it become fairly slightly more guide. turns out that Informix has a real rich, real effective capability, so they decided, let’s get this going on DB2, as a result of this can vastly impact DB2.”

    HADR gives a wizard-like interface that lets DBAs “construct and installation this [clustering] ability and additionally the automated client re-route and the precise mechanical failover capabilities that are very quick and intensely computerized once whatever fails,” says Jones.

    On the BI entrance, Jones says, DB2 8.2 points an extra contribution from Informix Dynamix Server. “The different is the Geodetic Extender it really is an present aspect known as the Geodetic information Blade,” he confirms. because of its Geodetic Extender part, DB2 8.2 can save third-dimensional geospatial statistics that's each place- and time-and-house-aware. This function should enchantment basically to clients in definite verticals (govt, protection, and transportation, together with restaurant chains and retailers) that on occasion use spatial facts to identify new company opportunities, officers say.

    somewhere else in BI additions, Jones says consumers can use DB2 cube Views to define OLAP-centric metadata—including hierarchies, dimensions, attributes, and enterprise guidelines or formulas—and shop it as a clear extension to DB2. within the revamped eight.2 unlock, this expertise has been tweaked to raise question performance.

    DB2 and Informix Dynamix to Merge in Subsequent Revisions

    IBM at the moment keeps separate building groups for DB2 UDB and Informix Dynamix, but Jones says huge Blue has plans to merge both product strains in the future. “we have the luxurious of having two building teams innovating simultaneously and sharing their improvements with one one more, with the most efficient aim of having the subsequent edition of DB2 and the next version of Informix Dynamix Server turn out to be being the equal issue,” he asserts.

    Jones features to IBM’s existing interoperability work with both facts retailers, together with pass-statistics-type aid and SQL standardization, which, he says, will make it possible emigrate from side to side between the two information stores. “The approach then is to aid Informix Dynamix Server and raise it via person requirements, however try this with a continual eye to getting closer and closer to regular functionality with DB2,” says Jones, who provides “that is a means off.”

    in the close-term, says Jones, IBM will proceed to guide latest Informix Dynamix customers. “Informix Dynamic Server remains turning out to be and being superior. they now have the Informix team nonetheless working on it, and we're assisting the Informix customer base,” he asserts.

    related Articles

    IBM presents Public Preview of “Stinger” DB2http://www.esj.com/information/article.asp?editorialsId=954

    IBM Database update activities BI-friendly Featureshttp://www.esj.com/business_intelligence/article.asp?id=7058&t=y

    about the writer

    Stephen Swoyer is a Nashville, TN-based mostly freelance journalist who writes about technology.


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    System and Administration: Informix Dynamic Server

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    IBM and AGS Announce Availability of New Solutions for Informix Dynamic Server | killexams.com real questions and Pass4sure dumps

    SOURCE: IBM

    July 05, 2007 12:00 ET

    New Server Studio and Sentinel R. 6.1 to Enable Rapid Adoption of IDS 11 "Cheetah"

    ARMONK, NY and NEW YORK, NY--(Marketwire - July 5, 2007) - IBM (NYSE: IBM) and AGS Ltd., a privately held purveyor of management solutions for data servers, today announced that the new Server Studio and Sentinel R. 6.1 -- the principal suite of integrated system management tools for IBM Informix Dynamic Server (IDS) -- is now available, with editions offered by both IBM and AGS.

    The IDS data server is a strategic element of IBM's Information Management software portfolio and the recently announced IDS 11 -- code named Cheetah -- delivers increased performance, reliability and scalability, along with the ability to handle massive volumes of complex data at very high speeds. IDS 11 is also the industry's first data server to provide clustered data centers with continuous data availability and disaster recovery regardless of the geographic location or distance between backup data center sites.

    Server Studio and Sentinel together form a powerful infrastructure of multi-platform tools that help both seasoned database professionals and novices alike manage IBM Informix data server environments with an unprecedented ease and productivity. Native support of IDS 11 new functionality in the Release 6.1 of Server Studio and Sentinel further enhances ability to deliver optimal performance, availability and maintainability of Informix databases throughout their entire operational life cycle.

    "Our long-term partnership with AGS underscores IBM's steadfast commitment to providing IDS clients with the performance optimization, availability and compliance management solutions they need," said Bernie Spang, director IBM data servers. "The new Release 6.1 of Server Studio and Sentinel will help protect the investment that their customers have made in their Informix data server infrastructures."

    The versatility, rich functionality and ease-of-use provided by Server Studio and Sentinel build on the legendary reliability and simple administration of IDS. The new tool set offered by AGS helps companies and organizations ensure that critical database applications remain up and perform at peak levels, allowing them to effectively manage change, handle regulatory compliance and assure availability of vital business information.

    Bank of America recently selected Server Studio and Sentinel for its IDS environment -- one of the world's largest distributed data centers processing online financial transactions.

    "The latest release of Server Studio and Sentinel provide a collection of integrated, highly productive system management tools that developers and DBAs working with IBM's Informix data servers have been demanding and waiting for. Informix now has very powerful graphical tools that exceed the capabilities of native and third party offerings available for any other database platform. Couple this with outstanding technical support and you get products with excellent value and a quick ROI," said Kevin Kleinhomer, Vice President at Bank of America. "In their large distributed environment, Server Studio and Sentinel have simplified and automated many DBA tasks. With these additions, IBM's Informix data servers have been made significantly easier to administer and monitor."

    Server Studio provides a comprehensive collection of easy-to-use, proven tools for DBAs and developers that improve efficiency of performing common database tasks such as: SQL development and debugging, schema management, configuration auditing and change management, performance tuning, data storage management and reorganization, security administration and more -- all from an integrated graphical console that unites development, administration and maintenance activities for an entire Informix infrastructure at a central point of control.

    Sentinel provides 24 × 7 operational monitoring, alerting, issue discovery, analysis and autonomic response automation infrastructure for IBM Informix data servers' environment. It's easy to deploy agent-less architecture equips DBAs with sophisticated diagnostics and remediation facilities which help pinpoint and resolve the underlying causes of performance bottlenecks and resources contention issues that adversely affect databases' availability and impact end users.

    Smaller companies and organizations that do not have large IT staffs to manage large data servers infrastructure have also benefited from the robust application development and administration capabilities provided by IDS and Server Studio.

    "As a software developer and DBA, Server Studio is a tool that I use every day, and it is exactly what I demand from my tools -- stable, reliable, and powerful," said Sean Durity, Manager of IT for CornerCap Investment Counsel. "Even the 'small' features of Server Studio are big timesavers. I can't imagine working with Informix and not using Server Studio. I won't work with anything less."

    The relationship between AGS and IBM began in 2000 when IBM began distributing AGS' Server Studio as the primary database development and administration tools suite with Informix data servers. Product management, engineering and QA teams of both companies work closely on product direction, technology development and QA testing of Server Studio and Sentinel.

    "We are proud of and greatly value their strategic partnership with IBM. Selection of AGS data servers' management solutions by IBM is a testament to their industry-leading technology," said Anatole Vishon, CEO of AGS Ltd. "We understand the vital importance of Informix, particularly in the retail, financial, telecommunications, healthcare, government and SMB sectors. AGS is committed to supporting existing capabilities and developing new technologies for Informix data servers to add value for IBM customers."

    Pricing and Availability

    The Release 6.1 of Server Studio and Sentinel are available now through IBM and AGS worldwide. The Core Edition of Server Studio is provided by IBM to Informix customers at no additional cost. Its basic functionality can be extended by purchase of various premium editions available directly from AGS.

    Additional information about Server Studio is available at: http://www.ibm.com/software/data/informix/serverstudio/, or http://www.serverstudio.com/products/serverstudio/

    Additional information about Sentinel is available at: http://www.ibm.com/software/data/informix/sentinel/, or http://www.serverstudio.com/products/sentinel/

    Additional information about Informix Dynamic Server is available at: http://www.ibm.com/software/data/informix/ids/

    AGS, Server Studio and Sentinel are trademarks or registered trademarks of Advanced Global Systems, Ltd. For a list of additional AGS trademarks, please see http://www.ags.com

    IBM, Informix Dynamic Server and the IBM e-business logo are trademarks or registered trademarks of International Business Machines Corporation. For a list of additional IBM trademarks, please see www.ibm.com/legal/copytrade.shtml

    All other company, product or service names may be trademarks or registered trademarks of others. Statements concerning IBM's future development plans and schedules are made for planning purposes only, and are subject to change or withdrawal without notice. Reseller prices may vary.


    Efficient Vehicle Tracking System Software Solution with Informix Dynamic Server | killexams.com real questions and Pass4sure dumps

    Nov 10, 2011

    Vaibhav Dantale

    Although  it is possible to develop an efficient Vehicle Tracking System using any database server, and many such solutions are already available in the market, Informix offers many advantages. Informix can reduce your disk space requirement, improve your query performance, and reduce your application development efforts, without special training or buying additional technology. The built-in technologies of Informix will reduce your total cost of ownership, so if these benefits are important to you, keep reading!

    A Vehicle Tracking System (VTS) tracks vehicles and provides different analytics, such as the total distance travelled, the total fuel consumption, the best routes, and so on. Certainly having more and more different kinds of alerts improves the efficiency of system. This system encompasses three phases of implementation: instrumentation, integration, and intelligence.

    Instrumentation: Each vehicle has a special device that records different parameters related to a vehicle, such as, speed, current location, fuel status, ignition status, and so on.

    Integration: Devices implemented in the field transmit information through an integrated system that includes a GPRS system and stores the information in a database.

    Intelligence: The intelligence on the information collected from the field is stored in a database, including different kinds of MIS reports, dashboards, current locations of vehicles, travel information, and reports of exceptions like geo-fence violations and fuel theft.

    Some of the characteristics of a VTS are:

  • Information about vehicles is collected every few minutes or as often as every minute
  • The volume of the data is huge
  • Performance is critical
  • Accuracy of the data matters the most
  • The application logic is specific to the industry (for example, geo-fencing, distance calculations, and so on)
  • Now let's see the advantages of Informix built-in technologies over the traditional relational approach.

    Disk Space Saving (62%)

    A vehicle tracking system collects the vehicle-related information, including a time stamp, with a specific frequency. Informix provides a data type that stores this type of time series information more efficiently than any traditional RDBMS approach. The following tables compare both approaches.

    Traditional RDBMS approach

    This table shows the structure of the tracking table in a traditional RDBMS.

    Vehicle number

    Timestamp

    Longitude

    Latitude

    Fuel

    Speed

    1

    2010-12-01 01:00:00.00000

    72.844060

    19.116280

    85.00

    40.00

    1

    2010-12-01 01:00:10.00000

    72.853800

    19.113470

    84.90

    39.00

    1

    2010-12-01 01:00:20.00000

    72.855000

    19.116560

    84.80

    42.00

    .

    .

    2

    2010-12-01 01:00:00.00000

    72.855370

    19.116570

    100.00

    45.00

    2

    2010-12-01 01:00:10.00000

    72.885120

    19.106000

    99.90

    45.00

    .

    .

    Informix TimeSeries data type approach

    Informix stores time series data in a specialized data type, called TimeSeries, which stores all the time series data for a particular vehicle in the same row. Informix supports two different types of time series: regular time series that stores the data with a fixed frequency, and irregular time series that stores the data for arbitrary points in time. A regular time series is the most suitable for a VTS. In a regular time series, the time stamp is stored only once as the origin of the time series and the time stamps of the rest of the rows are calculated using the offset from the origin.

    This table shows the structure of the tracking table in Informix, using the TimeSeries data type.

    Vehicle number

    TimeSeries column

    1

    [(72.844060, 19.116280,85.00,40.00), (72.853800, 19.113470,84.90, 39.00)....]

    2

    [(72.855370, 19.116570, 100.00,45.00), (72.885120, 19.106000, 99.90, 45.00)..]

    ..

    ..

    The data for each vehicle is stored in contiguous disk space on a page.

     

    Traditional RDBMS approach

    We create the traditional RDBMS table for storing vehicle tracking information, called vehicle_tracking:

    create table vehicle_tracking

    (

       vehicle_number integer, - 4 (bytes)

       timestamp datetime year to fraction(5) - 11(bytes)

       longitude decimal(10,8), - 6(bytes)

       latitude decimal(10,8)     - 6(bytes)

       speed decimal(5,2) - 4(bytes)

    );

    We create an index on the vehicle_number and timestamp columns.

    Suppose they have 10,000 vehicles to be tracked every minute and they need to store information for 90 days. Let's calculate the storage requirements.

    Record size                  = 4+11+6+6+4 = 31

    Record/slot overhead    = 4 bytes

    Total size of record       = 31 + 4 = 35 bytes

    Page overhead for maintaining page information = 28bytes per page

    Total free space on 2 K page size                                 = 2048-28 = 2020byte

    Total records on each page                                           = 2020/35=57

    Total number of records                                                = 10000*60*24*90 = 1296000000

    Total number of pages used                                          = 1296000000 / 57 = 22736842

    Total space required for data                                        = 22736842 * 2 KB = 43 GB

    Total space required for the index                                 =  34 GB

    The total space required for the vehicle_tracking table = 43 + 34 = 77GB

    Informix TimeSeries data type approach

    We create a TimeSeries data type, named vehicle_tracking_rt, and then create a table, named vehicle_tracking_ts, that includes the vehicle_tracking_rt column:

    create row type vehicle_tracking_rt

    (

       timestamp datetime year to fraction(5)

       longitude decimal(10,8),

       latitude decimal(10,8),

       speed decimal(5,2)

    );

     

    create table vehicle_tracking_ts

    (

       vehicle_number integer,

       vehicle_info timeseries(vehicle_tracking_rt)

    )

    We create an index on only the vehicle_number column.

    We store the vehicle number only once, hence the space required for the vehicle_number column = 10000*4 = 40000bytes=39 KB.

    We create the index on only the vehicle_number column, hence the total space required for the index = 10000*4=40000 bytes = 39 KB.

    We store the time stamp only once for each vehicle, hence the space required for the time stamp = 10000*11 = 110000 bytes = 107 KB.

    The space required for all remaining columns is:

    Record size                  = 6+6+4 = 16

    Record/slot overhead    = 4 bytes

    Total size of record       = 16 + 4 = 20 bytes

    Page overhead for maintaining page information = 28bytes + 16 bytes slot overhead Total free space on 2 K page size                           = 2048-44 = 2004 bytes

    Total records on each page                                           = 2004/20=100

    Total number of pages used per vehicle per day =  1440 / 100 = 15

    Total pages used per day                                              = 10000*15 = 150000

    Total space required for data on first day                       = 150000 * 2 KB = 0.29 GB

    Daily increment in data                                      = 0.27 GB

    Total space required for data of 90 days                       = 25 GB

    The total space required for the vehicle_tracking_ts table = 25 GB +39 KB +29 KB+ 107 KB = 25 GB

    This is a 68% disc space saving compared to a traditional RDBMS approach.

    Performance (up to 54 times faster)

    Let's consider few use cases:

  • Fuel theft information
  • Geo-fence exceptions
  • Total fuel consumption
  • For all of these use cases, the application scans through the data for one day.

    Traditional RDBMS performance

    The report generation requires the following disk reads:

    At least 5 disk reads through the index to reach to leaf nodes

    Each vehicle has 60*24 records per day = 1440

    Each vehicle needs 1440 non-cached disk reads

    Total non-cached distributed disk reads = 1440 * 10000 = 14.4 million

    Informix TimeSeries data type performance

    Because the index is only 39 KB, the scan effort is minimal.

    Because the TimeSeries data type stores data in contiguous space on a page, for a 2 K page size each page contains at least 2004/20  = 100 rows.

    Each vehicle needs 1440/100 = 15 pages = 15 disk reads.

    Total non-cached distributed disk reads = (15+ 1) * 10000 = 160,000

    Comparison table:

    Space

    Performance

    Traditional RDBMS

    77GB

    8.64 million

    Informix TimeSeries type

    25GB

    160,000

    Benefit

    68% space saving

    54 times faster

    The advantages of using the Informix TimeSeries implementation are:

  • Disk space reduction:  almost 62% disc space saving
  • Performance improvement is multifold: up to 110 times faster
  • Faster development: Informix has more than 80 built-in SQL functions to perform different operations on time series data, such as, aggregation, running average, slimming algorithms, interpolation and extrapolation, and so on.
  • Customized development: Informix provides C and Java APIs to let developers develop their own time series functions.
  • Application Development

    Because many operations in a VTS application are time based, the available built-in routines for the Informix TimeSeries data type makes development easy and fast.

    If they want to see the average speed of vehicle every 30 minutes, the RDBMS approach requires a large programming effort and a performance challenge. Whereas, with the Informix TimeSeries data type, they use the simple AggregateBy function to roll-up the information to any required time frequency.

    If they want to see the average speed of vehicle in last 30 days, the best method is to examine its running average (not its normal average). Again, showing the running average speed of vehicles with the RDBMS approach is a big programming and performance challenge. Whereas with the Informix TimeSeries data type, they use the simple TSRunningAvg function with the period and frequency that they want.

    Another basic need of VTS is storing location-related information. Location information can be in the form of a point specifying the location of vehicle, a LineString specifying the route, or a Polygon specifying the geo-fence of the vehicle. The easiest way to handle this type of information is by using the Informix spatial data types. Informix spatial data types not only optimally maintain the data, but also provide built-in routines that improve the accuracy and ease the development of your solution.

    Let's examine the use case of geo-fencing. Geo-fencing refers to the practice of limiting the vehicle movements to a specific geographical area by defining the latitude and longitude of the area in the form of a LineString or polygon.

    A geo-fence system raises an alarm if one of the vehicles leaves the fenced area and deviates from its designated route. This might happen because of the personal interest of the vehicle driver or because the vehicle is stolen.

    Traditional RDBMS approach

    We identify the different locations on the route the vehicle is supposed to travel and insert multiple rows into a fence table, comprising information like the vehicle ID and its location (latitude and longitude) information. If they need to track 200 different locations on the designated route for a particular vehicle, they insert 200 rows for that vehicle. To check if the vehicle is outside the fence area, they develop their own logic and run the cursor through these 200 rows to check if the current location is within any two points.

    To display the geo-fence on an online map, they create an XML file by running a cursor through all 200 records and then parse through the XML to display each point on the map.

    Informix spatial data types approach

    We define a column called geofence in the master table with a data type of either polygon or LineString. They store all 200 location co-ordinates in this single column.

    To check if the vehicle is within the fence area, they use the SQL function ST_Within (curr_loc,geofence). If the function returns "True," the vehicle is within the fence area; if it returns "False," the vehicle is outside the fence area.

    To display the geo-fence on an online map, they use SE_askml(geofence) function, which creates a KML file that they can import into the map.

    Advantages of using Informix spatial data types

  • Faster development:  functions like ST_within and SE_askml are readily available
  • Better performance: they don't need to run through multiple records
  • Assured accuracy:  they are using Open GIS Consortium-compliant function
  • More analytics: they can find the nearest location or the distance between any two locations using functions like Nearest and ST_distance
  • Summary

    Systems like a Vehicle Tracking System can be developed using any kind of database as a back-end. But using by the Informix TimeSeries and spatial built-in data types, the same system can be many times more efficient. The disk space saving of 60% and up to 54 times faster performance compared to traditional relational approach can enable you to increase the frequency of data collection, which means better accuracy.  The built-in functions for the  TimeSeries and spatial data types makes the application development task easier and provides for increased accuracy.

    About the author:

    Vaibhav Dantale is a software engineer within IBM Information Management division. He has been working on Informix for last 12 years, in various development, QA and technical management roles. Currently, Dantale focuses on  evangelizing Informix product in ASIA Pacific region. He is one of the Informix TimeSeries technical experts and has been involved in several  customer engagements on Informix TimeSeries. He has patents under his name and is co-author of a red book on Informix security features.


    Database Administration: Creating the Database Environment | killexams.com real questions and Pass4sure dumps

    Establishing a usable database environment requires a great deal of skill, knowledge, and consideration. This chapter will outline the principles involved in establishing a usable database environment.

    This chapter is from the book 

    One of the primary tasks associated with the job of DBA is the process of choosing and installing a DBMS. Unfortunately, many business executives and IT professionals without database management background assume that once the DBMS is installed, the bulk of the work is done. The truth is, choosing and installing the DBMS is hardly the most difficult part of a DBA’s job. Establishing a usable database environment requires a great deal of skill, knowledge, and consideration. This chapter will outline the principles involved in establishing a usable database environment.

    The process of choosing a suitable DBMS for enterprise database management is not as difficult as it used to be. The number of major DBMS vendors has dwindled due to industry consolidation and domination of the sector by a few very large players.

    Yet, large and medium-size organizations typically run multiple DBMS products, from as few as two to as many as ten. For example, it is not uncommon for a large company to use IMS or IDMS and DB2 on the mainframe, Oracle and MySQL on several different UNIX servers, Microsoft SQL Server on Windows servers, as well as pockets of other DBMS products such as Sybase, Ingres, Adabas, and PostgreSQL on various platforms, not to mention single-user PC DBMS products such as Microsoft Access, Paradox, and FileMaker. Who chose to install all these DBMSs and why?

    Unfortunately, often the answer is that not much thought and planning went into the decision-making process. Sometimes the decision to purchase and install a new DBMS is driven by a business need or a new application. This is reasonable if your organization has no DBMS and must purchase one for the first time. This is rarely the case, though. Regardless of whether a DBMS exists on-site, a new DBMS is often viewed as a requirement for a new application. Sometimes a new DBMS product is purchased and installed without first examining if the application could be successfully implemented using an existing DBMS. Or, more likely, the DBAs know the application can be implemented using an existing DBMS but lack the organizational power or support to reject a new DBMS proposal.

    There are other reasons for the existence of multiple DBMS platforms in a single organization. Perhaps the company purchased a commercial off-the-shelf application package that does not run on any of the current DBMS platforms. Sometimes the decision to buy a new DBMS is driven by the desire to support the latest and greatest technology. For example, many mainframe shops moving from a hierarchic (IMS) or CODASYL (IDMS) database model to the relational model deployed DB2, resulting in an additional DBMS to learn and support. Then, when client/server computing became popular, additional DBMSs were implemented on UNIX, Linux, and Windows servers.

    Once a DBMS is installed, removal can be difficult because of incompatibilities among the different DBMSs and the necessity of converting application code. Furthermore, when a new DBMS is installed, old applications and databases are usually not migrated to it. The old DBMS remains and must continue to be supported. This complicates the DBA’s job.

    So what should be done? Well, the DBA group should be empowered to make the DBMS decisions for the organization. No business unit should be allowed to purchase a DBMS without the permission of the DBA group. This is a difficult provision to implement and even more difficult to enforce. Business politics often work against the DBA group because it frequently possesses less organizational power than other business executives.

    Choosing a DBMS

    The DBA group should set a policy regarding the DBMS products to be supported within the organization. Whenever possible, the policy should minimize the number of different DBMS products. For a shop with multiple operating systems and multiple types of hardware, choose a default DBMS for the platform. Discourage deviation from the default unless a compelling business case exists—a business case that passes the technical inspection of the DBA group.

    Most of the major DBMS products have similar features, and if the feature or functionality does not exist today, it probably will within 18 to 24 months. So, exercise caution before deciding to choose a DBMS based solely on its ability to support a specific feature.

    When choosing a DBMS, it is wise to select a product from a tier-1 vendor as listed in Table 2.1. Tier 1 represents the largest vendors having the most heavily implemented and supported products on the market. You cannot go wrong with DB2 or Oracle. Both are popular and support just about any type of database. Another major player is Microsoft SQL Server, but only for Windows platforms. DB2 and Oracle run on multiple platforms ranging from mainframe to UNIX, as well as Windows and even handheld devices. Choosing a DBMS other than these three should be done only under specific circumstances.

    Table 2.1. Tier-1 DBMS Vendors

    DBMS Vendor

    DBMS Product

    IBM Corporation

    DB2

    New Orchard Road

    Armonk, NY 10504

    Phone: (914) 499-1900

    Oracle Corporation

    Oracle

    500 Oracle Parkway

    Redwood Shores, CA 94065

    Phone: (650) 506-7000

    Microsoft Corporation

    SQL Server

    One Microsoft Way

    Redmond, WA 98052

    Phone: (425) 882-8080

    After the big three come MySQL, Sybase, Teradata, and Informix. Table 2.2 lists these tier-2 DBMS vendors. All of these offerings are quality DBMS products, but their installed base is smaller, their products are engineered and marketed for niche purposes, or the companies are smaller with fewer resources than the Big Three (IBM, Oracle, and Microsoft), so there is some risk in choosing a DBMS from tier 2 instead of tier 1. However, there may be solid reasons for deploying a tier-2 solution, such as the high performance offered by Informix or the data warehousing and analytics capabilities of Teradata.

    Table 2.2. Tier-2 DBMS Vendors

    DBMS Vendor

    DBMS Product

    IBM Corporation

    Informix Dynamic Server

    New Orchard Road

    Armonk, NY 10504

    Phone: (914) 499-1900

    Sybase Inc. (an SAP Company)

    Adaptive Server Enterprise

    6475 Christie Avenue

    Emeryville, CA 94608

    Phone: (510) 922-3500

    Teradata Corporation

    Teradata

    10000 Innovation Drive

    Dayton, OH 45342

    Phone: (937) 242-4030

    MySQL (a subsidiary of Oracle Corporation)

    MySQL

    Phone: (208) 338-8100

    Of course, there are other DBMS products on the market, many of which are fine products and worthy of consideration for specialty processing, certain predefined needs, and niche roles. If your company is heavily into the open-source software movement, PostgreSQL, EnterpriseDB, or MySQL might be viable options. If an object DBMS is important for a specific project, you might consider ObjectDesign or Versant. And there are a variety of NoSQL DBMS offerings available, too, such as Hadoop, Cassandra, and MongoDB.1

    However, for the bulk of your data management needs, a DBMS from a tier-1, or perhaps tier-2, DBMS vendor will deliver sufficient functionality with minimal risk. A myriad of DBMS products are available, each with certain features that make them worthy of consideration on a case-by-case basis. Choosing any of the lower-tier candidates—even such major names as Software AG’s Adabas and Actian’s Ingres—involves incurring additional risk. Refer to Appendix B for a list of DBMS vendors.

    I do not want it to sound as if the selection of a DBMS is a no-brainer. You will need a strategy and a plan for selecting the appropriate DBMS for your specific situation. When choosing a DBMS, be sure to consider each of these factors:

  • Operating system support. Does the DBMS support the operating systems in use at your organization, including the versions that you are currently using and plan on using?
  • Type of organization. Take into consideration the corporate philosophy when you choose a DBMS. Some organizations are very conservative and like to keep a tight rein on their environments; these organizations tend to gravitate toward traditional mainframe environments. Government operations, financial institutions, and insurance and health companies usually tend to be conservative. More-liberal organizations are often willing to consider alternative architectures. It is not uncommon for manufacturing companies, dot-coms, and universities to be less conservative. Finally, some companies just do not trust Windows as a mission-critical environment and prefer to use UNIX; this rules out some database vendors (Microsoft SQL Server, in particular).
  • Benchmarks. What performance benchmarks are available from the DBMS vendor and other users of the DBMS? The Transaction Processing Performance Council (TPC) publishes official database performance benchmarks that can be used as a guideline for the basic overall performance of many different types of database processing. (Refer to the sidebar “The Transaction Processing Performance Council” for more details.) In general, performance benchmarks can be useful as a broad indicator of database performance but should not be the only determinant when selecting a DBMS. Many of the TPC benchmarks are run against database implementations that are not representative of most production database systems and therefore are not indicative of the actual performance of a particular DBMS. In addition, benchmarks are constantly updated to show new and improved performance measurements for each of the major DBMS products, rendering the benchmark “winners” obsolete very quickly.
  • Scalability. Does the DBMS support the number of users and database sizes you intend to implement? How are large databases built, supported, and maintained—easily or with a lot of pain? Are there independent users who can confirm the DBMS vendor’s scalability claims?
  • Availability of supporting software tools. Are the supporting tools you require available for the DBMS? These items may include query and analysis tools, data warehousing support tools, database administration tools, backup and recovery tools, performance-monitoring tools, capacity-planning tools, database utilities, and support for various programming languages.
  • The Transaction Processing Performance Council is an independent, not-for-profit organization that manages and administers performance benchmark tests. Its mission is to define transaction processing and database benchmarks to provide the industry with objective, verifiable performance data. TPC benchmarks measure and evaluate computer functions and operations.

    The definition of transaction espoused by the TPC is a business one. A typical TPC transaction includes the database updates for things such as inventory control (goods), airline reservations (services), and banking (money).

    The benchmarks produced by the TPC measure performance in terms of how many transactions a given system and database can perform per unit of time, for example, number of transactions per second. The TPC defines three benchmarks:

  • TPC-C, for planned production workload in a transaction environment
  • TPC-H, a decision support benchmark consisting of a suite of business-oriented ad hoc queries and concurrent data modifications
  • TPC-E, an updated OLTP workload (based on financial transaction processing)
  • Additional information and in-depth definitions of these benchmarks can be found at the TPC Web site at www.tpc.org (see Figure 2.1).

  • Technicians. Is there a sufficient supply of skilled database professionals for the DBMS? Consider your needs in terms of DBAs, technical support personnel (system programmers and administrators, operations analysts, etc.), and application programmers.
  • Cost of ownership. What is the total cost of ownership of the DBMS? DBMS vendors charge wildly varying prices for their technology. Total cost of ownership should be calculated as a combination of the license cost of the DBMS; the license cost of any required supporting software; the cost of database professionals to program, support, and administer the DBMS; and the cost of the computing resources required to operate the DBMS.
  • Release schedule. How often does the DBMS vendor release a new version? Some vendors have rapid release cycles, with new releases coming out every 12 to 18 months. This can be good or bad, depending on your approach. If you want cutting-edge features, a rapid release cycle is good. However, if your shop is more conservative, a DBMS that changes frequently can be difficult to support. A rapid release cycle will cause conservative organizations either to upgrade more frequently than they would like or to live with outdated DBMS software that is unlikely to have the same level of support as the latest releases.
  • Reference customers. Will the DBMS vendor supply current user references? Can you find other users on your own who might provide more impartial answers? Speak with current users to elicit issues and concerns you may have overlooked. How is support? Does the vendor respond well to problems? Do things generally work as advertised? Are there a lot of bug fixes that must be applied continuously? What is the quality of new releases? These questions can be answered only by the folks in the trenches.
  • When choosing a DBMS, be sure to take into account the complexity of the products. DBMS software is very complex and is getting more complex with each new release. Functionality that used to be supported only with add-on software or independent programs is increasingly being added as features of the DBMS, as shown in Figure 2.2. You will need to plan for and support all the features of the DBMS. Even if there is no current requirement for certain features, once you implement the DBMS the programmers and developers will find a reason to use just about anything the vendor threw into it. It is better to plan and be prepared than to allow features to be used without a plan for supporting them.

    Figure 2.2

    Figure 2.2. Convergence of features and functionality in DBMS software

    DBMS Architectures

    The supporting architecture for the DBMS environment is very critical to the success of the database applications. One wrong choice or poorly implemented component of the overall architecture can cause poor performance, downtime, or unstable applications.

    When mainframes dominated enterprise computing, DBMS architecture was a simpler concern. Everything ran on the mainframe, and that was that. However, today the IT infrastructure is distributed and heterogeneous. The overall architecture—even for a mainframe DBMS—will probably consist of multiple platforms and interoperating system software. A team consisting of business and IT experts, rather than a single person or group, should make the final architecture decision. Business experts should include representatives from various departments, as well as from accounting and legal for software contract issues. Database administration representatives (DA, DBA, and SA), as well as members of the networking group, operating system experts, operations control personnel, programming experts, and any other interested parties, should be included in this team.

    Furthermore, be sure that the DBMS you select is appropriate for the nature and type of processing you plan to implement. Four levels of DBMS architecture are available: enterprise, departmental, personal, and mobile.

    An enterprise DBMS is designed for scalability and high performance. An enterprise DBMS must be capable of supporting very large databases, a large number of concurrent users, and multiple types of applications. The enterprise DBMS runs on a large-scale machine, typically a mainframe or a high-end server running UNIX, Linux, or Windows Server. Furthermore, an enterprise DBMS offers all the “bells and whistles” available from the DBMS vendor. Multiprocessor support, support for parallel queries, and other advanced DBMS features are core components of an enterprise DBMS.

    A departmental DBMS, sometimes referred to as a workgroup DBMS, serves the middle ground. The departmental DBMS supports small to medium-size workgroups within an organization; typically, it runs on a UNIX, Linux, or Windows server. The dividing line between a departmental database server and an enterprise database server is quite gray. Hardware and software upgrades can allow a departmental DBMS to tackle tasks that previously could be performed only by an enterprise DBMS. The steadily falling cost of departmental hardware and software components further contributes to lowering the total cost of operation and enabling a workgroup environment to scale up to serve the enterprise.

    A personal DBMS is designed for a single user, typically on a low- to medium-powered PC platform. Microsoft Access, SQLite, and FileMaker2 are examples of personal database software. Of course, the major DBMS vendors also market personal versions of their higher-powered solutions, such as Oracle Database Personal Edition and DB2 Personal Edition. Sometimes the low cost of a personal DBMS results in a misguided attempt to choose a personal DBMS for a departmental or enterprise solution. However, do not be lured by the low cost. A personal DBMS product is suitable only for very small-scale projects and should never be deployed for multiuser applications.

    Finally, the mobile DBMS is a specialized version of a departmental or enterprise DBMS. It is designed for remote users who are not usually connected to the network. The mobile DBMS enables local database access and modification on a laptop or handheld device. Furthermore, the mobile DBMS provides a mechanism for synchronizing remote database changes to a centralized enterprise or departmental database server.

    A DBMS designed for one type of processing may be ill suited for other uses. For example, a personal DBMS is not designed for multiple users, and an enterprise DBMS is generally too complex for single users. Be sure to understand the differences among enterprise, departmental, personal, and mobile DBMS software, and choose the appropriate DBMS for your specific data-processing needs. You may need to choose multiple DBMS types—that is, a DBMS for each level—with usage determined by the needs of each development project.

    If your organization requires DBMS solutions at different levels, favor the selection of a group of DBMS solutions from the same vendor whenever possible. Doing so will minimize differences in access, development, and administration. For example, favor Oracle Database Personal Edition for your single-user DBMS needs if your organization uses Oracle as the enterprise DBMS of choice.

    DBMS Clustering

    Clustering is the use of multiple “independent” computing systems working together as a single, highly available system. A modern DBMS offers clustering support to enhance availability and scalability. The two predominant architectures for clustering are shared-disk and shared-nothing. These names do a good job of describing the nature of the architecture—at least at a high level.

    Shared-nothing clustering is depicted in Figure 2.3. In a shared-nothing architecture, each system has its own private resources (memory, disks, etc.). The clustered processors communicate by passing messages through a network that interconnects the computers. In addition, requests from clients are automatically routed to the system that owns the resource. Only one of the clustered systems can “own” and access a particular resource at a time. In the event a failure occurs, resource ownership can be dynamically transferred to another system in the cluster. The main advantage of shared-nothing clustering is scalability. In theory, a shared-nothing multiprocessor can scale up to thousands of processors because they do not interfere with one another—nothing is shared.

    In a shared-disk environment, all the connected systems share the same disk devices, as shown in Figure 2.4. Each processor still has its own private memory, but all the processors can directly address all the disks. Typically, shared-disk clustering does not scale as well for smaller machines as shared-nothing clustering. Shared-disk clustering is better suited to large-enterprise processing in a mainframe environment. Mainframes—very large processors—are capable of processing enormous volumes of work. Great benefits can be obtained with only a few clustered mainframes, while many PC and midrange processors would need to be clustered to achieve similar benefits.

    Shared-disk clustering is usually preferable for applications and services requiring only modest shared access to data and for applications or workloads that are very difficult to partition. Applications with heavy data update requirements are probably better implemented as shared-nothing. Table 2.3 compares the capabilities of shared-disk and shared-nothing architectures.

    Table 2.3. Comparison of Shared-Disk and Shared-Nothing Architectures

    Shared-Disk

    Shared-Nothing

    Quick adaptability to changing workloads

    Can exploit simpler, cheaper hardware

    High availability

    Almost unlimited scalability

    Performs best in a heavy read environment

    Works well in a high-volume, read-write environment

    Data need not be partitioned

    Data is partitioned across the cluster

    The major DBMS vendors provide support for different types of clustering with different capabilities and requirements. For example, DB2 for z/OS provides shared-disk clustering with its Data Sharing and Parallel Sysplex capabilities; DB2 on non-mainframe platforms uses shared-nothing clustering. Oracle’s Real Application Clusters provide shared-disk clustering.

    For most users, the primary benefit of clustering is the enhanced availability that accrues by combining processors. In some cases, clustering can help an enterprise to achieve five-nines (99.999 percent) availability. Additionally, clustering can be used for load balancing and failover.

    DBMS Proliferation

    As a rule of thumb, create a policy (or at least some simple guidelines) that must be followed before a new DBMS can be brought into the organization. Failure to do so can cause a proliferation of different DBMS products that will be difficult to support. It can also cause confusion regarding which DBMS to use for which development effort.

    As mentioned earlier, there is a plethora of DBMS vendors, each touting its benefits. As a DBA, you will be bombarded with marketing and sales efforts that attempt to convince you that you need another DBMS. Try to resist unless a very compelling reason is given and a short-term return on investment (ROI) can be demonstrated. Even when confronted with valid reasons and good ROI, be sure to double-check the arguments and ROI calculations. Sometimes the reasons specified are outdated and the ROI figures do not take everything into account—such as the additional cost of administration.

    Remember, every DBMS requires database administration support. Moreover, each DBMS uses different methods to perform similar tasks. The fewer DBMS products installed, the less complicated database administration becomes, and the better your chances become of providing effective data management resources for your organization.

    Hardware Issues

    When establishing a database environment for application development, selecting the DBMS is only part of the equation. The hardware and operating system on which the DBMS will run will greatly impact the reliability, availability, and scalability (RAS) of the database environment. For example, a mainframe platform such as an IBM zEC12 running z/OS will probably provide higher RAS than a midrange IBM xSeries machine running AIX, which in turn will probably exceed a Dell server running Windows. That is not to say everything should run on a mainframe; other issues such as cost, experience, manageability, and the needs of the applications to be developed must be considered. The bottom line is that you must be sure to factor hardware platform and operating system constraints into the DBMS selection criteria.

    Cloud Database Systems

    Cloud computing (see the sidebar) is increasing in usage, especially at small to medium-size businesses. A cloud implementation can be more cost-effective than building an entire local computing infrastructure that requires management and support.

    A cloud database system delivers DBMS services over the Internet. The trade-off essentially comes down to trusting a cloud provider to store and manage your data in return for minimizing database administration and maintenance cost and effort. Using cloud database systems can enable organizations, especially smaller ones without the resources to invest in an enterprise computing infrastructure, to focus on their business instead of their computing environment.

    By consolidating data sources in the cloud, it is possible to improve collaboration among partners, branch offices, remote workers, and mobile devices, because the data becomes accessible as a service. There is no need to install, set up, patch, or manage the DBMS software because the cloud provider manages and cares for these administrative tasks. Of course, the downside is that your data is now stored and controlled by an external agent—the cloud provider. Another inherent risk of cloud computing is the possibility of nefarious agents posing as legitimate customers.

    An example of a cloud database platform is Microsoft SQL Azure. It is built on SQL Server technologies and is a component of the Windows Azure platform.



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