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IBM DB2 10 DBA for

IBM Brings lively-active Mirroring Into Db2 For i Database

April 24, 2019 Timothy Prickett Morgan

As a platform that's approaching forty years of deployment within agencies that can’t have enough money downtime with their mission crucial methods – that’s counting the system/38 as smartly as the AS/400 and its follow-ons as part of the identical continuum – it is no surprise in any respect that IBM midrange techniques running RPG and COBOL had one of the crucial most subtle – and maybe the simplest software-centric – clustering software ever developed.

Concurrent with the launch of IBM i 7.4 this week, big Blue is rolling out a new sort of database clustering, which is known as Db2 mirror, it's intended for consumers who can't have any chance of downtime in any respect in their transaction processing programs. Db2 reflect is a supplemental function to the Db2 for i database and is just available on Power8 and Power9 techniques working IBM i 7.four. it's also just a little diverse from the excessive availability clustering tools offered by using Maxava, Syncsort (which ate imaginative and prescient solutions, which bought rivals iTera in 2006 and Lakeview technology in 2007), and DataMirror (which IBM purchased in 2007 after which sold to Rocket utility in 2012), and we're frankly attempting to work out simply how diverse.

What they will let you know is that Db2 reflect creates what is referred to as an lively-lively database cluster across two machines. Which is distinct from the lively-passive setups that many enterprise-grade high availability clustering suggestions make use of. within the former case, a cluster of two machines can be found to do work, and often this work can also be pleasing and infrequently the machines are configured in such a method that transactions commit throughout a pair of machines at anything very closely approximating the equal time.

This Db2 replicate setup is just a little different from fault tolerant machines from days passed by from Tandem computer systems and Stratus technologies, however is clearly impressed by using it, and it is also impressed by database clustering technologies created by way of IBM, similar to Sysplex and Parallel Sysplex for the system z mainframe (which begun again in 1990) in addition to Oracle’s true application Clusters (or RAC), which become derived from the TruCluster utility created with the aid of Digital gadget for its Tru64 Unix platform and is itself according to the VAXCluster application for the venerable VMS operating equipment and the RDB database for the VAX platform. Some concept little doubt comes from IBM’s own Db2 PureScale distributed database, which changed into a allotted, parallel database extension of IBM’s Db2 database for AIX and Linux, which scaled as much as 128 server nodes in a cluster, tons additional than the 32 mainframes in a Parallel Sysplex and the eight nodes in an Oracle RAC cluster. And let’s not forget that once IBM turned into having drawback scaling up its hardware with NUMA expertise within the mid-Nineties, it created DB2 Multisystem to created a shared nothing clustering setup an identical in some ways (but certainly not all) to Tandem and Stratus and Oracle Parallel Server, the predecessor to Oracle RAC. IBM’s PowerHA does disk-primarily based replication of information through mirrored storage arrays and excessive speed networks as opposed to database replication through remote journaling throughout a pair of servers, which has been part of the plumbing of OS/400, i5/OS, and IBM i because 1999.

there are lots of how you can dermis excessive availability clustering on the system stage and on the database degree, and none of us has time to discover all of them, no rely how captivating it's. Suffice it to say, Db2 reflect is a new manner, which Steve Will, IBM i chief architect, tells us has been beneath construction for the previous three years and comes as a result of some key IBM i clients have been pushing for lively-energetic database clustering on the platform to permit them to have continual availability – or as lots as that you can expect to have with two machines mirrored at the database degree within a single datacenter.

“Db2 replicate isn't a journal-based mostly aspect,” Will explains. “In Db2 mirror, in the event you pair two programs collectively, every database operation occurs to the databases on each systems at the exact same time. So if you do a desk update and your utility occurs to be pointing on the database, that database operation does not complete that update until it has gotten to each systems. this is now not a actual replication solution like with PowerHA. the same thing would ensue with PowerHA, but you can should put that database into an independent auxiliary storage pool (iASP) that could ought to replicate to the other aspect. but then on the other side, that database wasn’t available for doing active work against it. So there's a change right here with Db2 mirror. They don't depend upon journals. that you can have unbiased ASPs, that’s high-quality, but they don't rely upon unbiased ASPs. You don’t ought to access the database in any specific way, old or new fashion or something.”

Given how a great deal lively-energetic clustering goes on out there on this planet – you could get it for windows Server and Linux techniques running most up to date relational databases, and there are some basically clever parallel, dispensed databases impressed by using work done by using hyperscalers such as Google, facebook, Microsoft, and Amazon that are available as open supply as well – you may have thought that the Db2 for i database at the coronary heart of the IBM i platform might have energetic-lively clustering long considering that. however there was one precise stickler in the means: the single-degree storage architecture of the device/38, the AS/400, and their comply with-ons.

With single degree storage, the working gadget treats the means of main reminiscence, disk, and now flash storage as a single continuum of addressable memory area and abstracts the differences away so far as the database is worried. This architecture is in reality genius and exciting on earth, and to date simplest IBM has been in a position to make it work, and best in its midrange server line. This puts overhead on the device, nevertheless it has radically simplified programming, which is the hallmark of the AS/four hundred and its progeny. but single stage storage gets in the manner just a little with active-active mirroring, since it is like asking two different people share the equal recollections and not going insane.

Unix, windows Server, and Linux active-active clustering technologies have a a bit of less difficult time, in response to Will.

“a part of the intent is the how they cluster after which scale. These applied sciences definitely flip over the file gadget to the storage devices more than that we're capable of. one of the most factors, architecturally, that IBM i has not had energetic-lively before here is that they wanted to be capable of retain the one degree shop architecture but they couldn’t unfold it throughout assorted methods. They had to discover a method to try this, where each and every gadget still had its personal address space as a result of that single stage store is how they do their file gadget. no one else has a file system like that. so they don’t ought to worry about that. instead they have hierarchical storage techniques, they need to spend time doing locking, and all sorts of other stuff that they don’t. There’s nothing wrong with that – it’s just that’s their architecture. but they mandatory on the database layer became to coordinate every operation in order that each operation can be could be mirrored throughout the cluster. And the greater nodes you had, the much less doubtless it might be that they might be able to meet the performance pursuits of lots of their huge purchasers.”

and that's why Db2 reflect is limited to a pair of methods, as a minimum in its preliminary unlock. Which is first-class. valued clientele who need greater processing oomph can purchase methods with greater sockets and shared memory clustering the usage of NUMA innovations at the hardware level. and those who want more than that can use Db2 Multisystem to partition their database tables and run them across a cluster of up 32 machines working in parallel in a shared-nothing setup similar to these Tandem and Stratus machines. Db2 mirror isn't about scale, but continual availability, but it is enjoyable to contemplate a massive IBM i cluster with as much as 32 nodes operating Db2 Multisystem to scale up the efficiency of machines with the aid of scaling out the hardware and then the usage of Db2 reflect to have another set of 32 nodes that makes it constantly attainable. The mind reels. . . .

Db2 replicate requires the new IBM i 7.four free up, which they record on elsewhere during this challenge, however shoppers aren't required to purchase it or installation it any longer than they have got been required to purchase Db2 Multisystem for more than a decade. Like Db2 Multisystem, Db2 reflect is integrated into the platform and the database, however it is a separately licensed product – in this case, costing $20,000 per core. each IBM i 7.four and Db2 mirror may be available on June 21, which is the AS/four hundred’s thirty first birthday.

We could be drilling down into the architecture and getting some feedback on Db2 reflect from the folks selling HA utility in line with faraway journaling suggestions. What they are able to say presently is that Db2 reflect requires a excessive velocity Ethernet adapter linking both machines that helps the RDMA over Converged Ethernet (RoCE) protocol, which is a clone of the far off Direct memory entry strategies constructed into InfiniBand switching two decades ago. This permits machines to access each other’s memories remotely, however it does have a distance limit of about 1 kilometer. What this potential is that Db2 mirror can be respectable for continual availability within a datacenter, nevertheless it doesn’t do jack for disaster healing throughout a far off datacenter, be it one working in the cloud by way of a carrier issuer or one operated by an organization itself.

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No influence discovered, are trying new keyword!3 easy methods to Deal should you’re Intimidated by means of Your New crew Member Deborah Sweeney, CEO, by way of Fairygodboss now not everyone is excited when new hires be part of the office. It’s definitely a good deal ...

IBM’s Db2 in a Multi-Cloud World - The records Layer

within the age of desktop studying and AI in the cloud, everyone desires to do more with their statistics. With over 70% of enterprises the use of three or more clouds, it's crucial to keep in mind the implications of where your records is stored and how it is managed. Leveraging a common database engine -- throughout clouds -- lets you focus your efforts to your purposes and never on idiosyncrasies of particular person cloud databases.

be a part of us for a are living webinar, The statistics Layer: IBM’s Db2 in a Multi-Cloud World, where IBM utility architect Bowen Turetzky will talk about:

  • What multi-cloud capability for your information; multi-cloud by design vs multi-cloud by accident; and what a multi-cloud information layer seems like
  • The four key benefits of picking out IBM’s Db2 managed functions for a multi-cloud records layer solution
  • a way to leverage a typical information layer throughout cloud suppliers with regular equipment
  • Register for this unique webinar nowadays!

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    DB2 10 DBA for z/OS

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    Top 5 New DB2 10 for z/OS Features Aimed at SAP Applications

    As IBM draws ever nearer to announcing an availability date for DB2 10 for z/OS, the list of new features has solidified. This month’s article examines the top five features aimed specifically at SAP applications running under DB2 for z/OS.

    As IBM draws ever nearer to announcing an availability date for DB2 10 for z/OS, the list of new features has solidified and it’s possible for specific types of user to begin the process of evaluating just what will be of benefit to them. SAP remains a vital strategic partner for IBM, and DB2 10 has a large number of features aimed specifically at SAP applications running under DB2 for z/OS. In this month’s piece, we’ll examine my top five.

    64-Bit Exploitation

    In DB2 Version 8, IBM embarked upon a major project to transform DB2 into a 64-bit RDBMS, removing many of the addressability issues inherent in the previous 31-bit memory model. DB2 Version 8 also moved several key storage areas above the 2GB “bar” into the newly-addressable memory space, relieving some of the storage constraints and allowing more workload per DB2 subsystem. DB2 9 increased scalability by a further 10 percent to 15 percent by moving another set of storage areas above the bar, but even with those enhancements, most customers have been limited to running a maximum of 400-500 concurrent active connections within each DB2 system. As a result, many DB2 data sharing customers were forced to use more DB2 members than otherwise necessary in order to support their workloads. Although DB2’s industry-leading data sharing architecture minimizes the processing overheads, each additional member will impact overall performance and resource usage.

    Figure 1 below shows a typical scenario for a SAP environment. In this example, a data sharing group consisting of four DB2 members is used in order to support 1,600 concurrent threads from four SAP application servers.

    Typical SAP Data Sharing ConfigurationFigure 1 – Typical SAP Data Sharing Configuration

    In DB2 10, IBM has completed the bulk of the remaining work in the 64-bit migration effort, with 80 percent to 90 percent of the remaining DB2 storage structures moving above the bar. This has enabled a spectacular increase in the number of threads that can be supported by a single subsystem – most customers will be able to achieve 5-10 times the number of concurrent connections compared to DB2 9.

    This will allow many customers to reduce the number of DB2 members needed to support their workloads, resulting in net CPU and memory savings and improving application performance.

    Figure 2 below shows that the same 1,600 thread workload can be handled by just two DB2 subsystems, with significant scope for additional workload growth (initial SAP benchmarks show 2,500 threads per DB2 system is sustainable).

    Potential DB2 10 SAP Data Sharing ConfigurationFigure 2 – Potential DB2 10 SAP Data Sharing Configuration

    DB2 Catalog Restructure

    The Catalog and Directory are some of the most vital components in any DB2 system. They contain a set of tables and internal structures that represent all of the metadata necessary for the subsystem to operate, and is used extensively by nearly every DB2 process from application programs to DBAs creating a new database.

    DB2 10 includes some important enhancements to the Catalog, which will be very welcome to SAP users. These include:

  • Standard UTS format. In previous releases, the catalog used a non-standard internal storage format and maintained links between the various tables using special internal pointers. DB2 10 converts some key Catalog structures to use the standard Universal Table Space Partition by Growth (UTS PBG) format introduced in DB2 9. This change allows standard online REORG processes to be used against the catalog, improving performance and availability compared to previous releases.
  • Contention between various processes needing to read/update the Catalog can cause significant operational disruption. As part of the same change, the converted Catalog tables have been spread across many more table spaces than before, and row level locking has been implemented to allow DB2 10 to support much higher levels of current access than was previously possible.

  • Maximum Catalog Size. Many DB2 subsystems have to support hundreds of thousands of database objects. Each of these objects must be recorded in the DB2 Catalog and in some cases the 64GB limit for certain components such as the SPT01 table space can be a scalability limitation. DB2 10 addresses the 64GB limitation on the SPT01 table space by moving some large columns into LOB (Large Object) columns. This makes use of the inline LOB support added in DB2 10, making the Catalog tables more readable and allowing more packages to be supported within a single DB2 system.
  • Anyone that has ever worked with SAP on DB2 for z/OS knows that it requires a very large number of DB2 objects to be created (and changed during SAP upgrades), and there can be catalog contention issues if several streams of DDL are running at the same time. The enhancements in DB2 10 promise to significantly reduce the frequency and impact of these issues.


    Any new release of DB2 is expected to deliver some performance benefits, but DB2 10 has the most comprehensive and easily accessible package of enhancements of any release in the past 20 years. Here are a few that are of especial interest to SAP users:

  • Internal code optimization. Parts of critical DB2 internal code (including DDF, RDS, Data Manager and Index Manager) have been reworked in DB2 10 to reduce pathlength and improve efficiency.  In addition, work has been done to improve CPU cache performance and take advantage of the latest System z hardware instructions. Collectively, these enhancements will provide significant “out of the box” savings to SAP users as soon at the DB2 10 upgrade is complete.
  • Parallel Index INSERT. Many SAP workloads (such as Banking or Retail) involve heavy INSERT workloads. In such cases, the overheads of maintaining multiple indexes can be significant, and this can be the major factor in determining the overall response time and throughput for some major SAP business processes.
  • DB2 previously updated indexes sequentially but in DB2 10, it is able to overlap the I/O operations for index updates, reducing the elapsed time for these processes. In common with other parallel activities, reduced elapsed time is usually achieved at the cost of an increase in overall CPU time, but in this case, the overhead is very small and eligible for offload to a zIIP engine if one is available.

  • Safe Query Optimization. The DB2 optimizer often has to make educated guesses on the amount of data that will be filtered by a given predicate in an SQL statement. Enhancements to the optimizer in DB2 10 allow it to take into account the degree of confidence it has with these estimates, allowing it to choose a slightly more expensive access path if it has significantly lower risk associated with it. This is just one of a number of optimizer enhancements, which will benefit SAP queries in DB2 10.
  • MEMBER CLUSTER for UTS Tablespaces

    SAP has aggressively adopted the new Universal Tablespace Partition by Growth (UTS BPG) format introduced in DB2 9. This led to many productivity benefits, with SAP DBAs having to spend less time manually managing space allocations for rapidly growing tables. However, UTS tablespaces did not previously support the MEMBER CLUSTER option, which can be very important in a data sharing environment to reduce space-map contention during high INSERT activity. This meant that the poor DBAs had to convert many tables back to traditional partitioned format (using unload/drop/ create/reload as there was no ALTER support to move from UTS to partitioned).

    DB2 10 allows MEMBER CLUSTER to be used for UTS tablespaces, removing the need to move back to the traditional partitioned format and saving a lot of DBA time in the process.

    SAP DSNZPARM Support

    SAP can be a demanding application, and comes with some very specific requirements for the way in which the supporting DB2 for z/OS system is installed and configured. Previously, this required the DB2 systems programmer to work through a long list of DSNZPARM and other system settings to ensure that the system was configured according to SAP’s specifications.

    DB2 10 introduces a new install CLIST input member (called DSNTIDXB) which contains the SAP-recommended settings for DSNZPARMs, buffer pools and other configuration information. This will allow new SAP DB2 systems to be installed and configured much more rapidly than before.

    Useful Links

    » See All Articles by Columnist Julian Stuhler

    CA expedites required DB2 10 upgrades for z/OS

    How collaboration apps foster digital transformation

    CA Technologies Delivers Same-Day Support for IBM DB2 10 for z/OS

    ISLANDIA, N.Y., Oct. 26 /PRNewswire/ -- CA Technologies (Nasdaq: CA) today announced "Day One" support for IBM®  DB2 10® for z/OS across more than 30 products, including CA Database Management for DB2 for z/OS, CA ACF2™,  CA Top Secret® security management solutions and CA Easytrieve® application reporting. This support helps customers maximize the benefits of the new DB2 release and helps provide for the integrity and security of critical organizational assets.

    In addition, CA Mainframe Software Manager (CA MSM) eases the upgrade process and accelerates time-to-benefit as customers move to DB2 10.

    "Same day support for IBM's DB2 10 is a demonstration of CA Technologies commitment to enabling customers to simplify the management of the mainframe and improve operational efficiency," said Dayton Semerjian, general manager, Mainframe, CA Technologies. "Using their management products, customers can leverage greater agility to support business needs, while helping to drive down costs."

    Additionally, the upcoming r14.5 release of CA Database Management for DB2 for z/OS is being engineered to help customers save time and money by addressing database and application performance issues, simplifying database administration, and improving backup and recovery efficiency.

    CA Technologies is also developing its new CA Mainframe Chorus for DB2 Database Management workspace to support DB2 10.

    CA Technologies recently announced same-day support for IBM's new, innovative zEnterprise model z196 hardware and z/OS 1.12, and continues to provide timely support for all System z hardware platforms and operating systems.

    CA Technologies is a charter member of the International DB2 Users Group (IDUG) and maintains active participation in IBM's vendor program for DB2, both of which help the company keep its portfolio of management solutions current with new releases.  CA Technologies involvement in IDUG also helps the company partner with customers to better understand and meet their needs with innovative solutions like CA Mainframe Chorus for DB2 Database Management.  

    More information on CA Technologies broad portfolio of mainframe software can be found at:

    (Logo: )

    (Logo: )

    About CA Technologies

    CA Technologies (NASDAQ: CA) is an IT management software and solutions company with expertise across all IT environments – from mainframe and distributed, to virtual and cloud. CA Technologies manages and secures IT environments and enables customers to deliver more flexible IT services. CA Technologies innovative products and services provide the insight and control essential for IT organizations to power business agility. The majority of the Global Fortune 500 relies on CA Technologies to manage evolving IT ecosystems. For additional information, visit CA Technologies at

    Follow CA Technologies


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    Copyright © 2010 CA. All Rights Reserved. One CA Plaza, Islandia, N.Y. 11749. IBM and z/OS are trademarks of International Business Machines Corporation in the United States, other countries, or both. All other trademarks, trade names, service marks, and logos referenced herein belong to their respective companies.

    Press contact:

    Michael Kornspan

    (631) 342-2463

    SOURCE CA Technologies

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