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1Z0-870 MySQL 5 Certified Associate

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1Z0-870 exam Dumps Source : MySQL 5 Certified Associate

Test Code : 1Z0-870
Test Name : MySQL 5 Certified Associate
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: 240 Real Questions

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Oracle MySQL 5 Certified Associate

New Names for sun Certifications below Oracle | killexams.com Real Questions and Pass4sure dumps

Written with the aid of GoCertify workforce published: 01 September 2010

With the merger of sun certifications into the Oracle certification program, ailment all sun certifications for Java, Solaris, MySQL, and Open workplace had been renamed under the Oracle brand.

On September 1, 2010, Oracle built-in the existing certifications from solar Microsystems' certification software into the Oracle Certifed expert application as part of the acquisition of solar by means of Oracle. each solar certification changed into renamed to reflect the brand new Oracle branding, as mapped out under. The content of the connected checks and scoring had been not changed.

start to: Java | Solaris | MySQL | OpenOffice

Java Certifications

common solar nameNew Oracle nameSun licensed Java associate Oracle licensed affiliate, Java SE 5/SE 6 sun certified Java Programmer (SCJP) SE fiveOracle certified skilled, Java SE 5 Programmer sun certified Java Programmer (SCJP) SE 6 Oracle licensed knowledgeable, Java SE 6 Programmer sun certified Java Developer (SCJD) Oracle licensed master, Java SE6 Developer solar certified internet part Developer (SCWCD) EE5 Oracle certified professional, Java EE 5 internet part Developer sun certified business element Developer (SCBCD) EE5 Oracle licensed knowledgeable, Java EE 5 company element Developer sun certified Developer for Java web features 5 (SCDJWS) Oracle licensed skilled, Java EE 5 web functions Developer sun licensed commercial enterprise Architect (SCEA) EE5 Oracle certified master, Java EE 5 commercial enterprise Architect solar certified cellular software Developer (SCMAD) Oracle certified knowledgeable, Java ME 1 mobile software Developer sun certified JSP and Servlet Developer for the Java EE6 Platform Oracle licensed knowledgeable, Java Platform, enterprise version 6 JavaServer Pages and Servlet Developer solar licensed EJB Developer for the Java EE6 Platform Oracle certified expert, Java Platform, enterprise edition 6 enterprise JavaBeans Developer solar licensed JPA Developer for the Java EE6 Platform Oracle certified expert, Java Platform, commercial enterprise edition 6 Java Persistence API Developer sun certified Developer for the Java web functions for the Java EE6 Oracle certified knowledgeable, Java Platform, enterprise edition 6 internet services Developer solar certified Developer for the JSF for the Java EE6 Platform Oracle certified skilled, Java Platform, business version 6 JavaServer Faces Developer sun certified specialist for NetBeans IDE Oracle certified knowledgeable, NetBeans built-in development environment 6.1 Programmer solar certified Integrator for identification manager 7.1 This certification become retired by means of Oracle solar certified Java CAPS Integrator This certification turned into retired by way of Oracle  

Solaris Certifications

usual solar nameNew Oracle callSun certified Solaris associate (SCSAS) Oracle licensed affiliate, Oracle Solaris 10 operating equipment sun certified device Administrator (SCSA) for Solaris OS 10 Oracle certified knowledgeable, Oracle Solaris 10 gadget Administrator solar certified community Administrator (SCNA) for Solaris OS 10 Oracle licensed knowledgeable, Oracle Solaris 10 network Administrator sun licensed protection Administrator (SCSECA) for Solaris OS 10 Oracle certified knowledgeable, Oracle Solaris 10 safety Administrator

MySQL Certifications

common solar nameNew Oracle nameSun licensed MySQL 5.0 Database Administrator (SCMDBA) Oracle certified knowledgeable, MySQL 5.0 Database Administrator sun certified MySQL 5.0 Developer (SCMDEV) Oracle certified skilled, MySQL 5.0 Developer solar licensed MySQL affiliate (SCMA) Oracle licensed affiliate, MySQL 5.0/5.1/5.5Sun licensed MySQL 5.1 Cluster Database Administrator (SCMCDBA) Oracle licensed professional, MySQL 5.1 Cluster Database Administrator

OpenOffice Certifications

original solar callNew Oracle callSun licensed OpenOffice.org Calc expertOracle licensed knowledgeable, OpenOffice.org Calc solar licensed OpenOffice.org provoke expertOracle certified skilled, OpenOffice.org impress solar licensed OpenOffice.org writer expertOracle licensed expert, OpenOffice.org writer

The individual checks had been renamed as neatly, following the same naming scheme. A pdf version of this list that includes the examination names is attainable on Oracle's blog.


5 on-line courses to Crack Java Certification (OCAJP - 1Z0-808) in 2019 | killexams.com Real Questions and Pass4sure dumps

if you're making ready for the Oracle certified Java SE 8 associate exam, often known as OCAJP eight and OCPJP 8 with exam codes 1Z0-808 and searching for an honest online direction to kick delivery your practise, then you definately have come to the correct region.

in this article, i will share probably the most best online courses to prepare for Java SE 8 certifications. first off, a huge congratulations on making the appropriate decision to develop into a certified Java developer.

if you're a Java developer, then getting your certification will not only distinguish you from hundreds of thousands of alternative non-licensed Java programmers however additionally enhance your advantage and knowing of Java SE 8.

in case you are searching for a job, then this may help you to get a more robust job, and if you are searching for career increase, e.g. to develop into senior Java developer, these certifications can support you to get that promotion.

The Oracle licensed associate examination (required for all Oracle Certification) can also be intricate to move, even for experienced Java builders. I actually have viewed many Java developers having 2 to 4 years of event in Java going into an exam with out guidance and coming returned either with a very low rating or failing the exam.

One reason for it really is the knowledge stage of the examination is somewhat deep. It makes a speciality of details that many Java builders have no idea, although they've labored in Java for years. that is why coaching is awfully crucial.

A developer once talked about, "failing to put together means getting ready to fail."

So be sure you spend some time to consider the top-rated way to put together for Java certifications. The appropriate practise now not simplest helps you flow the examination but also ranking over ninety %, which gives you an extra aspect over other candidates all through any job search or advertising dialogue.

I actually have shared my event, advice, and components like books, free tests, simulators, and answering questions for Java developers making ready for OCAJP and OCPJP. that you would be able to also search through here to locate about greater elements and FAQs about these certifications.

without additional ado, right here is my record of one of the crucial choicest on-line Java certification lessons that you can take to kick-birth your training.

for the reason that both OCAJP and OCPJP require a deep understanding of exam topics, it be a good idea to beginning with a training direction after which comply with-up with a certification book like Mala Gupta's OCAJP eight book.

this fashion, you'll now not most effective be trained more advantageous however additionally bear in mind improved, as exam certification ebook presents questions within the identical structure of the true examination.

1. comprehensive Java SE 8 Developer Bootcamp - OCA Prep covered

here's an important on-line practicing course for a beginner who's gaining knowledge of Java SE eight and desires to become a certified developer, like sparkling graduates who wish to start a career in utility development or builders who wish to increase their marketability by way of discovering the nuts and bolts of Java.

This direction teaches you Java SE 8 within the boot camp fashion where the focal point is to supply palms-on advantage. On the manner, you profit a solid realizing of the themes covered within the exam to become an Oracle-licensed associate, Java SE 8 Programmer (Java SE eight Programmer I 1Z0-808)

2. Oracle Java Certification — pass the associate 1Z0-808 exam

this is a further splendid on-line course for Java builders preparing for the OCAJP 8 exam.

it is going to train you every little thing you deserve to recognize become an Oracle licensed affiliate Java 8 Programmer.

The teacher, Goran Lochert, is a certified Java developer himself and an authority, with decades of programming event in Java.

Goran knows first hand what is required to move the examination as a result of he has performed it himself. he will take you via each and every and each topic you deserve to master to be able to flow the exam and receive your reputable Oracle certification.

Best OCAJP 8 online training

three. The complete Java Masterclass

here's likely the foremost course to be taught Java in prevalent but it surely additionally lets you put together for OCAJP 8 subject matters. i recommend this on-line route to any one who's researching Java and need to pass a 1Z0-808 certification exam.

This training path isn't most effective regarding OCAJP themes however you should be aware of Java earlier than you revise these themes and that's the reason where this course excel.

After completing this course, you have got a decent abilities of Java and you'll fill the gaps between your talents and exam issues through analyzing a very good OCAJP certification book like this one.

4. First Oracle Certification: develop into a licensed Java Engineer

if you’re a newbie looking to study Java or an experienced programmer trying to find an internet practicing direction to prepare for Oracle's Java certification e.g. OCAJP 8 or 1Z0-808 examination, then here's the right path for you.

This path additionally covers all exam issues, and after this route, college students should be in a position to pass the Oracle licensed affiliate, Java SE 8 Programmer (1Z0-808) exam.

5. Java Certification: OCA (1Z0-808) follow test 

This online course covers all OCAJP 8 issues and additionally contains apply checks comprising of 260+ numerous alternative questions to verify Oracle certified affiliate, Java SE eight Programmer I instruction.

These are hand-picked questions that mimic the actual certification exam and are time-sure, which will help you get prepared for the leading exam atmosphere.

this is all for now on one of the vital most desirable online courses to prepare for Oracle's Java affiliate and professional Certifications. if in case you have registered for the 1Z0-808 or 1Z0-809 exam, then you can take these classes to delivery your certification adventure. in case you are searching for greater effective supplies, e.g. books and examination simulators, then that you can try my following articles.

Thanks for studying this article! in case you find these Java certification online working towards classes advantageous, please share along with your friends and colleagues. if in case you have any query or doubt, then drop a word below.

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5 constructive advice to Clear Oracle Database Certification exam | killexams.com Real Questions and Pass4sure dumps

today, with possibly a bit of smaller enthusiasm, a opt for few can also be maintained of a rare and robust method—Oracle Database Administrator Certification. It still gives handsomely, however you needn't sit down on a tripod in an ancient temple to use it. Receiving it, youngsters, is all the time a trip.

1) Make Lighted Early

If the ultimate purpose is Oracle DBA Certification, you have first to test to be an Oracle certified associate (OCA). This components fully takes time and a lot of training. you are taking two examinations and qualify to work as part of a team on junior DB management.

both examinations latest alternate options. which you can take and clear anyone of these three:

· Oracle Database 12c: SQL Fundamentals 1Z0-061—can you create, improve, manage and edit information in a database? do you know, and might you employ, SQL? You might be asked to application in SQL

· Oracle Database 11g: SQL Fundamentals-I 1Z0-051—this more or less succeeds “Introduction to Oracle9i SQL” with sixty four questions to answer in 2 hours. Questions contain presenting statistics from diverse tables; recuperating, sorting and restraining information; creating schema objects; and coping with set operators.

To have a brilliant probability of clearing anyone of these, take capabilities of oraclestudy.com or get hold of a necessary a part of this training as a component of an undergraduate diploma software in database programming. you're going to additionally require passing the Oracle Database 11g: Administration-I 1Z0-052 examination.

The Oracle Database 11g: Administration-I 1Z0-052 examination is a ninety-minute examine by which you install DB environments, developing and keeping diverse Oracle instances. Configure and comfortable these conditions, exhibit the potential of database backup and restoration, and administrate and control storage arrangements. You need to now not most effective be aware of the appropriate reply but the correct flow for answering the issue.

2) understand the distinction between OCD and OCP

It is right that a variety of database directors make the most of performing to have obsessive-compulsive ailment (OCD) however to get to the heights of Oracle DB Administrator certification, you ought to become an Oracle licensed knowledgeable (OCP). This aspect suggests (after already being an OCA) taking two courses and passing an examination in either DB 11g or DB 12c.

The route choice between 11g and 12c is dazzling. These courses must be tutor-led, a virtual classification, or practicing on demand situations.

3) Convert your self to master

master certification is the Oracle belfry. An Oracle licensed master (OCM) can work at superior tiers in IT departments nearly any place, dealing with gentle data, explaining complex challenges, and getting high salaries.

The requirement for OCM is OCA and OCP. comprehensive two additional lessons (akin to the coursework for OCP) that are instructor-led, digital, or working towards-on-demand. also, submit outcomes of a old session, then opt for the Oracle Database 11g: certified master examination 11G (OCM). to cite from Oracle’s website:

members scored on their capability to complete indicated initiatives and to recuperate from a number of database flop scenarios. statistics from every participant's environment is obtained on the conclusion of every condition and used to examine the last score. In some scenes, individuals might also receive partial credit, youngsters the inability to get well from a failure scenario results in zero self belief for a whole state of affairs.

four) earnings from DB certification

when you are depressed as you scale these boundaries of Oracle Database Administrator Certification necessities and assessments, be trained what may additionally look ahead to you: improved earnings. in keeping with Oracle’s earnings Survey, among North American members, the pay difference for general revenue is enjoyable:

· Oracle licensed: $ninety nine,190

· Non-certified: $ninety two,276

The Bureau of Labor data (BLS)—maybe a much less biased journalist than Oracle itself notes that the median annual wage for all DB administrators, as of might also 2016, was $84,950, with an predicted 10 p.c job growth through 2024.

5) instruct your self

a pretty good vicinity to delivery the pilgrim’s path to Oracle Database Administrator Certification is through taking on-line follow exams provides via oraclestudy.com with a attention in Database Programming. discuss with oracle study nowadays to learn what the the next day may dangle for you! It may well be the most effective decision You Ever Make!


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MaxScale: A New Tool to Solve Your MySQL Scalability Problems | killexams.com real questions and Pass4sure dumps

Written by Yves Trudeau

Ever since MySQL replication has existed, people have dreamed of a good solution to automatically split read from write operations, sending the writes to the MySQL master and load balancing the reads over a set of MySQL slaves. While if at first it seems easy to solve, the reality is far more complex.

First, the tool needs to make sure it parses and analyses correctly all the forms of SQL MySQL supports in order to sort writes from reads, something that is not as easy as it seems. Second, it needs to take into account if a session is in a transaction or not.

While in a transaction, the default transaction isolation level in InnoDB, Repeatable-read, and the MVCC framework insure that you’ll get a consistent view for the duration of the transaction. That means all statements executed inside a transaction must run on the master but, when the transaction commits or rollbacks, the following select statements on the session can be again load balanced to the slaves, if the session is in autocommit mode of course.

Then, what do you do with sessions that set variables? Do you restrict those sessions to the master or you replay them to the slave? If you replay the set variable commands, you need to associate the client connection to a set of MySQL backend connections, made of at least a master and a slave. What about temporary objects like with “create temporary table…”? How do you deal when a slave lags behind or what if worse, replication is broken? Those are just a few of the challenges you face when you want to build a tool to perform read/write splitting.

Over the last few years, a few products have tried to tackle the read/write split challenge. The MySQL_proxy was the first attempt I am aware of at solving this problem but it ended up with many limitations. ScaleARC does a much better job and is very usable but it stills has some limitations. The latest contender is MaxScale from MariaDB and this post is a road story of my first implementation of MaxScale for a customer.

Let me first introduce what is MaxScale exactly. MaxScale is an open source project, developed by MariaDB, that aims to be a modular proxy for MySQL. Most of the functionality in MaxScale is implemented as modules, which includes for example, modules for the MySQL protocol, client side and server side.

Other families of available modules are routers, monitors and filters. Routers are used to determine where to send a query, Read/Write splitting is accomplished by the readwritesplit router. The readwritesplit router uses an embedded MySQL server to parse the queries… quite clever and hard to beat in term of query parsing.

There are other routers available, the readconnrouter is basically a round-robin load balancer with optional weights, the schemarouter is a way to shard your data by schema and the binlog router is useful to manage a large number of slaves (have a look at Booking.com’s Jean-François Gagné’s talk at PLMCE15 to see how it can be used).

Monitors are modules that maintain information about the backend MySQL servers. There are monitors for a replicating setup, for Galera and for NDB cluster. Finally, the filters are modules that can be inserted in the software stack to manipulate the queries and the resultsets. All those modules have well defined APIs and thus, writing a custom module is rather easy, even for a non-developer like me, basic C skills are needed though. All event handling in MaxScale uses epoll and it supports multiple threads.

Over the last few months I worked with a customer having a challenging problem. On a PXC cluster, they have more than 30k queries/s and because of their write pattern and to avoid certification issues, they want to have the possibility to write to a single node and to load balance the reads. The application is not able to do the Read/Write splitting so, without a tool to do the splitting, only one node can be used for all the traffic. Of course, to make things easy, they use a lot of Java code that set tons of sessions variables. Furthermore, for ISO 27001 compliance, they want to be able to log all the queries for security analysis (and also for performance analysis, why not?). So, high query rate, Read/Write splitting and full query logging, like I said a challenging problem.

We experimented with a few solutions. One was a hardware load balancer that failed miserably – the implementation was just too simple, using only regular expressions. Another solution they tried was ScaleArc but it needed many rules to whitelist the set session variables and to repeat them to multiple servers. ScaleArc could have done the job but all the rules increases the CPU load and the cost is per CPU. The queries could have been sent to rsyslog and aggregated for analysis.

Finally, the HA implementation is rather minimalist and they had some issues with it. Then, they tried MaxScale. At the time, it was not GA and was (is still) young. Nevertheless, I wrote a query logging filter module to send all the queries to a Kafka cluster and they gave it a try. Kafka is extremely well suited to record a large flow of queries like that. In fact, at 30k qps, the 3 Kafka nodes are barely moving with cpu under 5% of one core. Although they encountered some issues, remember MaxScale is very young, it appeared to be the solution with the best potential and so they moved forward.

The folks at MariaDB behind MaxScale have been very responsive to the problems they encountered and they finally got to a very usable point and the test in the pilot environment was successful. The solution is now been deployed in the staging environment and if all goes well, it will be in production soon. The following figure is simplified view of the internals of MaxScale as configured for the customer:

MaxScale internals

The blocks in the figure are nearly all defined in the configuration file. They define a TCP listener using the MySQL protocol (client side) which is linked with a router, either the readwritesplit router or the readconn router.

The first step when routing a query is to assign the backends. This is where the read/write splitting decision is made. Also, as part of the steps required to route a query, 2 filters are called, regexp (optional) and Genlog. The regexp filter may be used to hot patch a query and the Genlog filter is the logging filter I wrote for them. The Genlog filter will send a json string containing about what can be found in the MySQL general query log plus the execution time.

Authentication attempts are also logged but the process is not illustrated in the figure. A key point to note, the authentication information is cached by MaxScale and is refreshed upon authentication failure, the refresh process is throttled to avoid overloading the backend servers. The servers are continuously monitored, the interval is adjustable, and the server status are used when the decision to assign a backend for a query is done.

In term of HA, I wrote a simple Pacemaker resource agent for MaxScale that does a few fancy things like load balancing with IPTables (I’ll talk about that in future post). With Pacemaker, they have a full fledge HA solution with quorum and fencing on which they can rely.

Performance wise, it is very good – a single core in a virtual environment was able to read/write split and log to Kafka about 10k queries per second. Although MaxScale supports multiple threads, they are still using a single thread per process, simply because it yields a slightly higher throughput and the custom Pacemaker agent deals with the use of a clone set of MaxScale instances. Remember they started early using MaxScale and the beta versions were not dealing gracefully with threads so they built around multiple single threaded instances.

So, since a conclusion is needed, MaxScale has proven to be a very useful and flexible tool that allows to elaborate solutions to problems that were very hard to tackle before. In particular, if you need to perform read/write splitting, then, try MaxScale, it is best solution for that purpose I have found so far. Keep in touch, I’ll surely write other posts about MaxScale in the near future.


First Look: MySQL 5.1 Open Source Database | killexams.com real questions and Pass4sure dumps

News

First Look: MySQL 5.1 Open Source Database MySQL 5.1 was released by Sun Microsystems in April, but I decided to test it out this month. I downloaded the Windows version of this open source database management app and gave it a spin.

The setup script added the MySQL server component with minimal interaction on my part. A wizard helped me perform the initial configuration and define a root password. After that, MySQL was fully functional and I was able to get to work right away.

I tested MySQL with a GUI frontend. Database operations were very fast during my test run, even with my larger databases. I did not encounter any bugs or problems during the tests.

I was extremely impressed with how easy it was to deploy MySQL 5.1 on a Windows system. In contrast, installation on other platforms (such as Linux) has typically been much more difficult.

MySQL 5.1 includes extensive documentation, with a SQL language reference in addition to MySQL troubleshooting tips. The language reference is an exceptional addition to the package, since many software manuals only teach the user how to operate the software itself.

By default, MySQL 5.1 uses a command line environment for running SQL statements. SQL code must by typed directly into the terminal by the user. When SELECT and SHOW queries are executed on the command line, the data are presented in a nice tabular format. However, distortion can occur if your terminal window is not wide enough. It can cause the text to wrap to the next line.

Expert users may prefer the command line. Other users may wish to install a front-end, such as phpMyAdmin or HeidiSQL, which can make working with databases and tables easier. MySQL has powerful server-side and clustering functionality. However, it is also very useful on the client side for smaller applications, especially when combined with a GUI front-end.

MySQL 5.1 is definitely worth a try, with its many new features listed here . The database app works with Windows x64, Mac OS X and various forms of Linux and UNIX OSes. You can download Version 5.1 at this link .


New Features in MySQL 5.0 | killexams.com real questions and Pass4sure dumps

This chapter is from the book 

This section discusses some of the important new features that are being developed in MySQL 5.0:

These are all recent additions, so this section is relatively brief to provide just an overview. Because the capabilities described here are new, you may encounter limitations. However, development is ongoing, so as these features mature and restrictions are eased, their usefulness will increase.

Using Views

A view is a virtual table. That is, it acts like a table but actually contains no data. Instead, it is defined in terms of tables (or other views) and provides alternative ways to look at table data. Often this can simplify applications. Views were introduced in MySQL 5.0.1.

A simple view can be nothing more than a way to select a subset of a table's columns. Suppose that you often want to select only the last_name, first_name, city, and state columns from the president table, but you don't want to write out all the columns like this:

SELECT last_name, first_name, city, state FROM president;

Nor do you want to use SELECT *. That's easier to write, but * retrieves columns that you don't want. The solution is to define a view that retrieves only the desired columns:

CREATE VIEW vpres AS SELECT last_name, first_name, city, state FROM president;

Now the view acts as a "window" into just those columns that you want to see. This means that you can use SELECT * with the view and get back only the columns named in the view definition:

mysql> SELECT * FROM vpres; +------------+---------------+---------------------+-------+ | last_name | first_name | city | state | +------------+---------------+---------------------+-------+ | Washington | George | Wakefield | VA | | Adams | John | Braintree | MA | | Jefferson | Thomas | Albemarle County | VA | | Madison | James | Port Conway | VA | | Monroe | James | Westmoreland County | VA | ...

If you include a WHERE clause, MySQL adds it to the view definition when executing the statement to further restrict the result:

mysql> SELECT * FROM vpres WHERE last_name = 'Adams'; +-----------+-------------+-----------+-------+ | last_name | first_name | city | state | +-----------+-------------+-----------+-------+ | Adams | John | Braintree | MA | | Adams | John Quincy | Braintree | MA | +-----------+-------------+-----------+-------+

The same is true if you add ORDER BY, LIMIT, and so forth.

When you use a view, you can refer only to those columns named in the view definition. That is, you cannot refer to a column that is not part of the view:

mysql> SELECT * FROM vpres WHERE suffix <> ''; ERROR 1054 (42S22): Unknown column 'suffix' in 'where clause'

The column names for a view by default are those named in the output column list of its SELECT statement. To provide column names explicitly, add a list of names in parentheses following the view name in the view definition:

mysql> CREATE VIEW vpres2 (ln, fn) AS -> SELECT last_name, first_name FROM president;

Now when you refer to the view, you must use the given column names rather than the names in the SELECT:

mysql> SELECT last_name, first_name FROM vpres2; ERROR 1054 (42S22) at line 1: Unknown column 'last_name' in 'field list' mysql> SELECT ln, fn FROM vpres2; +------------+---------------+ | ln | fn | +------------+---------------+ | Washington | George | | Adams | John | | Jefferson | Thomas | | Madison | James | | Monroe | James | ...

A view can be used to perform calculations automatically. In Chapter 1, they developed a statement that determines the age of presidents at death. The same calculation can be incorporated into a view definition:

mysql> CREATE VIEW pres_age AS -> SELECT last_name, first_name, birth, death, -> (YEAR(death) - YEAR(birth)) -> - IF(RIGHT(death,5) < RIGHT(birth,5),1,0) -> AS age -> FROM president;

This view includes an age column that is defined as a calculation, and selecting that column from the view retrieves the results of the calculation:

mysql> SELECT * FROM pres_age; +------------+---------------+------------+------------+------+ | last_name | first_name | birth | death | age | +------------+---------------+------------+------------+------+ | Washington | George | 1732-02-22 | 1799-12-14 | 67 | | Adams | John | 1735-10-30 | 1826-07-04 | 90 | | Jefferson | Thomas | 1743-04-13 | 1826-07-04 | 83 | | Madison | James | 1751-03-16 | 1836-06-28 | 85 | | Monroe | James | 1758-04-28 | 1831-07-04 | 73 | ...

By including the age calculation in the view definition, it's no longer necessary to write out the formula to see the age values. The view hides the details.

A view can refer to multiple tables, which makes it easier to run queries that involve joins. The following view looks up scores, joining them with student and grade event information:

mysql> CREATE VIEW vstudent AS -> SELECT student.student_id, name, date, score, category -> FROM grade_event, score, student -> WHERE -> grade_event.event_id = score.event_id -> AND score.student_id = student.student_id;

When you select from the view, MySQL executes the join and returns information from multiple tables:

mysql> SELECT * FROM vstudent; +------------+-----------+------------+-------+----------+ | student_id | name | date | score | category | +------------+-----------+------------+-------+----------+ | 1 | Megan | 2004-09-03 | 20 | Q | | 3 | Kyle | 2004-09-03 | 20 | Q | | 4 | Katie | 2004-09-03 | 18 | Q | | 5 | Abby | 2004-09-03 | 13 | Q | | 6 | Nathan | 2004-09-03 | 18 | Q | | 7 | Liesl | 2004-09-03 | 14 | Q | | 8 | Ian | 2004-09-03 | 14 | Q | ...

The view makes it trivial to retrieve the scores for a particular student by name:

mysql> SELECT * FROM vstudent WHERE name = 'emily'; +------------+-------+------------+-------+----------+ | student_id | name | date | score | category | +------------+-------+------------+-------+----------+ | 31 | Emily | 2004-09-03 | 11 | Q | | 31 | Emily | 2004-09-06 | 19 | Q | | 31 | Emily | 2004-09-09 | 81 | T | | 31 | Emily | 2004-09-16 | 19 | Q | | 31 | Emily | 2004-09-23 | 9 | Q | | 31 | Emily | 2004-10-01 | 76 | T | +------------+-------+------------+-------+----------+

Some views are updatable, which means that you can insert, update, and delete rows in the underlying table by means of operations on the view. Here is a simple example:

mysql> CREATE TABLE t (i INT); mysql> INSERT INTO t (i) VALUES(1),(2),(3); mysql> CREATE VIEW v AS SELECT i FROM t; mysql> SELECT i FROM v; +------+ | i | +------+ | 1 | | 2 | | 3 | +------+ mysql> INSERT INTO v (i) VALUES(4); mysql> DELETE FROM v WHERE i < 3; mysql> SELECT i FROM v; +------+ | i | +------+ | 3 | | 4 | +------+ mysql> UPDATE v SET i = i + 1; mysql> SELECT i FROM v; +------+ | i | +------+ | 4 | | 5 | +------+

For a view to be updatable, it must map directly onto a single table, it must select only columns that are simple references to table columns (not arbitrary expressions), and any operation on a view row must correspond to an operation on a single row in the underlying table. For example, if a view involves a summary calculated using an aggregate function, each view row can be based on multiple underlying table rows. In this case, the view is not updatable because there is no way to tell which underlying table row should be updated.

Using Stored Procedures

Beginning with MySQL 5.0.0, it is possible to define stored routines. These are functions and procedures that are stored on the server side and that can be invoked later. Stored functions return a result and can be included in expressions just like built-in functions. Stored procedures do not return a result directly. However, they support parameter types that can have their values set in the body of the procedure such that the values can be accessed by the caller after the procedure finishes.

Generally, you use a function to calculate a value to be returned to the caller for use in expressions. Use a procedure if you need only to invoke a routine to produce an effect or action without returning a value. These are guidelines, not hard and fast rules. For example, if you need to return more than one value, you cannot use a function. But you can define a procedure that has OUT parameters that can be used in expressions after the procedure returns.

Stored routines provide the following benefits and capabilities:

  • They extend SQL syntax to include looping and branching statements. (The syntax for all stored routine statements is given in Appendix E.)

  • They provide a mechanism for handling errors.

  • Because they are stored on the server side, all the code needed to define them need be sent over the network only once at routine creation time, not each time you invoke them. This reduces overhead.

  • They provide a means to standardize computational operations. By providing a set of stored routines as a "library" that many applications can use, those applications all perform the operations in the same way.

  • To create a stored function or procedure, use a CREATE FUNCTION or CREATE PROCEDURE statement. The following example creates a function. In the preceding section on views, they defined a view that included a column that performed an age calculation for the rows in the president table. If you want to use such a calculation more generally than in the context of a particular view, define the calculation as a function so that you can invoke it in arbitrary expressions.

    mysql> delimiter $ mysql> CREATE FUNCTION age (date1 DATE, date2 DATE) -> RETURNS INT -> BEGIN -> DECLARE age INT; -> SET age = (YEAR(date2) - YEAR(date1)) -> - IF(RIGHT(date2,5) < RIGHT(date1,5),1,0); -> RETURN age; -> END$ mysql> delimiter ;

    The function begins with a RETURNS clause to indicate the data type of its return value. This is followed by the function body. Because the body consists of multiple statements, they're enclosed within a BEGIN/END block. The body declares a local variable, assigns the result of the calculation to it, and returns it as the function value. A function body must include at least one RETURN statement to return a value to the caller. (This function could have been written more concisely to use return the calculation result directly from the RETURN statement, but I wanted to illustrate variable declaration and use.)

    The age() function takes two DATE arguments and can be invoked like any built-in function:

    mysql> SELECT first_name, last_name, birth, death, age (birth, death) -> FROM president; +---------------+------------+------------+------------+-------------------+ | first_name | last_name | birth | death | age(birth, death) | +---------------+------------+------------+------------+-------------------+ | George | Washington | 1732-02-22 | 1799-12-14 | 67 | | John | Adams | 1735-10-30 | 1826-07-04 | 90 | | Thomas | Jefferson | 1743-04-13 | 1826-07-04 | 83 | | James | Madison | 1751-03-16 | 1836-06-28 | 85 | | James | Monroe | 1758-04-28 | 1831-07-04 | 73 | ...

    Actually, there is one difference between how you refer to stored functions and built-in functions. For a stored function, the opening parenthesis need not immediately follow the function name. In fact, if you give a stored function the same name as a built-in function, you must have a space between the name and the parenthesis (both when you define the function and when you invoke it).

    In the preceding example, notice the delimiter commands surrounding the function definition statement. If a routine body consists of a single statement, you can write it at the end of the CREATE FUNCTION or CREATE PROCEDURE statement with no special treatment. However, if a routine body consists of multiple statements, each must be terminated by semicolon (';'). That also is the default statement terminator for the mysql program, which introduces a conflict. To deal with this, use the delimiter command to redefine mysql's statement delimiter to a character or string that does not appear in the routine definition. That causes mysql not to interpret semicolons as terminators and to pass the entire definition to the server as a single statement. You can redefine the terminator to semicolon again after defining the routine.

    A stored procedure is similar to a stored function, but it doesn't return a value. Therefore, it does not include a RETURNS clause or any RETURN statements. Here is a simple stored procedure that takes one argument, a year, and displays information for presidents born in that year:

    mysql> DROP PROCEDURE IF EXISTS born_in_year; mysql> CREATE PROCEDURE born_in_year (year_of_birth INT) -> SELECT first_name, last_name, birth, death -> FROM president -> WHERE YEAR(birth) = year_of_birth;

    In this case, the body of the routine consists of a single statement, so no delimiter commands are necessary. The procedure issues a SELECT statement. The results of this statement are not returned as the procedure value, but instead are passed as a result set to the client. To see this, invoke the procedure, which is done by using CALL:

    mysql> CALL born_in_year(1908); +------------+-----------+------------+------------+ | first_name | last_name | birth | death | +------------+-----------+------------+------------+ | Lyndon B. | Johnson | 1908-08-27 | 1973-01-22 | +------------+-----------+------------+------------+ mysql> CALL born_in_year(1913); +------------+-----------+------------+------------+ | first_name | last_name | birth | death | +------------+-----------+------------+------------+ | Richard M | Nixon | 1913-01-09 | 1994-04-22 | | Gerald R | Ford | 1913-07-14 | NULL | +------------+-----------+------------+------------+

    The example illustrates one thing that stored procedures can do that stored functions in MySQL currently cannot: Procedures can access tables. This prohibition on referring to tables in stored functions presumably will be lifted in the future. As a workaround for this limitation on functions, you can define a procedure that performs the required table operation, and include in the definition an OUT or INOUT parameter to send back as the procedure "value" when the procedure returns. This technique also can be useful if you need to return more than one value, because functions return only a single value.

    By default, a procedure parameter is an IN parameter. The caller passes a value, and it can be modified within the procedure, but any changes are not visible to the caller after the procedure returns. An OUT parameter is the opposite. The procedure assigns a value to the parameter, which can be accessed by the caller after the procedure returns. An INOUT parameter allows the caller to pass in a value, and to get a value back.

    The following example is similar to the preceding one, but instead of displaying columns from president table rows, it simply counts the number of rows and assigns the count to an OUT parameter. The caller gets the count from that parameter after invoking the procedure.

    mysql> delimiter $ mysql> CREATE PROCEDURE count_born_in_year -> (year_of_birth INT, OUT how_many INT) -> BEGIN -> DECLARE c CURSOR FOR -> SELECT COUNT(*) FROM president WHERE YEAR(birth) = year_of_birth; -> OPEN c; -> FETCH c INTO how_many; -> CLOSE c; -> END$ mysql> delimiter ; mysql> CALL count_born_in_year(1908, @count); mysql> SELECT @count; +--------+ | @count | +--------+ | 1 | +--------+ mysql> CALL count_born_in_year(1913, @count); mysql> SELECT @count; +--------+ | @count | +--------+ | 2 | +--------+

    The procedure does not simply invoke the SELECT statement and assign the value of the COUNT(*) column to a variable. If it did that, the result of the statement would be displayed to the client directly. To suppress this display, the procedure sets up a cursor and uses it to execute the SELECT statement. This way the result of the SELECT goes to the procedure itself so that it can process the result directly.

    To use a cursor, declare it to associate it with the statement to be executed. Then open the cursor, fetch the rows of the statement, and close the cursor. In many applications, the FETCH statement will appear inside some kind of a loop construct such as a REPEAT statement. However, in the count_born_in_year() procedure, the SELECT returns only a single row and there is no need for a loop.

    To invoke the procedure, pass a year value as the first parameter, and provide a variable into which the count should be placed as the second parameter. After the procedure returns, the variable value will contain the count.

    Using Triggers

    Trigger support is available as of MySQL 5.0.2. A trigger can be defined to activate for INSERT, DELETE, or UPDATE statements for a table, and can be set to activate either before or after each row processed by the statement. The trigger definition includes a statement that executes when the trigger activates. Currently, there are no trigger-specific privileges, so you must have the SUPER privilege to define a trigger.

    Triggers in MySQL currently have the same limitation as stored functions that they cannot refer to tables in general. They can refer only to the values in the current row being modified in the table that is associated with the trigger. This lessens the usefulness of triggers for certain applications. For example, you cannot perform change logging by recording deletes, inserts, and updates for a table to maintain a change history. Nevertheless, even in their current early implementation, triggers offer some important features:

  • A trigger can examine the current contents of a row before it is deleted or updated.

  • A trigger can examine new data values to be inserted or used to update a row.

  • In a BEFORE trigger, the trigger can change the new values before they are stored in the database, which enables you to perform data filtering.

  • The following example shows a trigger for INSERT statements for a table t. It is a BEFORE trigger so that it can examine data values before they are inserted into the table. The trigger performs two actions:

  • The trigger checks for attempts to insert negative numbers into the table's integer column and converts them to zero instead.

  • The trigger automatically provides a value of NOW() for the DATETIME column. In effect, this works around the limitation that a column's default value must be a constant, and implements TIMESTAMP-like automatic initialization for a DATETIME column.

  • mysql> CREATE TABLE t (i INT, dt DATETIME); mysql> delimiter $ mysql> CREATE TRIGGER t_ins BEFORE INSERT ON t -> FOR EACH ROW BEGIN -> SET NEW.dt = CURRENT_TIMESTAMP; -> IF NEW.i < 0 THEN SET NEW.i = 0; END IF; -> END$ mysql> delimiter ; mysql> INSERT INTO t (i) VALUES(-2),(0),(2); mysql> SELECT * FROM t; +------+---------------------+ | i | dt | +------+---------------------+ | 0 | 2005-01-23 12:14:11 | | 0 | 2005-01-23 12:14:11 | | 2 | 2005-01-23 12:14:11 | +------+---------------------+

    In the same way as for stored routines, the body of a trigger can contain multiple statements if you enclose them within a BEGIN/END block. In this case, you'll need to change the default delimiter so that you can use ';' as the delimiter within the trigger definition. The preceding example uses this technique.

    The syntax NEW.col_name can be used in the trigger body to refer to columns in the new row to be inserted or updated in an INSERT or UPDATE trigger. Similarly, OLD.col_name can be used to refer to columns in the old row to be deleted or updated in a DELETE or UPDATE trigger. OLD and NEW are not case sensitive.

    Triggers can refer to user variables, so you can set a variable within a trigger to pass a result outside of the trigger. This gives you a way to check what effect the trigger had.



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    Worldatwork [2 Certification Exam(s) ]
    XML-Master [3 Certification Exam(s) ]
    Zend [6 Certification Exam(s) ]





    References :


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