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000-702 - UDB V8.1 for z/OS Database Administration - Dump Information

Vendor : IBM
Exam Code : 000-702
Exam Name : UDB V8.1 for z/OS Database Administration
Questions and Answers : 122 Q & A
Updated On : April 19, 2019
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000-702 Questions and Answers

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000-702 UDB V8.1 for z/OS Database Administration

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000-702 exam Dumps Source : UDB V8.1 for z/OS Database Administration

Test Code : 000-702
Test Name : UDB V8.1 for z/OS Database Administration
Vendor Name : IBM
Q&A : 122 Real Questions

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IBM UDB V8.1 for z/OS

Tackling Slowdowns: Utility Throttling in IBM DB2 UDB V8.1.2 and beyond - web page 2 | killexams.com Real Questions and Pass4sure dumps

How Does Throttling Work?

To handle throttling, there is an algorithm this is busy guaranteeing that DB2 UDB is privy to the utility's load on the equipment and adjusts its consumption accordingly. A simplified illustration of this algorithm is shown beneath:

The DBA ellipse represents the atmosphere of the UTIL_IMPACT_LIM parameter that relies on the DBA and the company policy. The DB2 ellipse encapsulates the utilities which are running. all through utility operations, a sensor interacts with the Adaptive Controller box (which is truly interior DB2 UDB), and it runs algorithms that determine a metric for computing degradation. It compares that back price with a baseline estimation for the workload and the "impact allowances," as defined by using the DBA. If there's an issue, a separate process will cause the utility to "sleep" except it's in compliance with the set policy.

The graph on the appropriate plots a sample of the output for the aforementioned OLTP workload with the BACKUP utility operating. during this test, the UTIL_IMPACT_LIM parameter was set to 50 (represented by the purple line). The genuine efficiency numbers are plotted in blue. that you can see that DB2 UDB became in a position to hold the workload constant with the aid of throttling the utility after it surpassed the goal threshold and the throttling algorithm took impact.

more consultant of the real world would be a state of affairs involving diverse concurrent workloads on the device.

right here check had a twin workload with the BACKUP utility running concurrently. On the left side of the diagram, which you can see the workload distribution between the two functions, with the whole gadget useful resource proven in blue. On the correct facet of the diagram, the BACKUP utility has been invoked, once more with the UTIL_IMPACT_LIM = 50. in case you seem to be at the correct facet of the diagram, that you can see that the "meat" of the workloads' impact on the system is now at 900 seconds, compared to 600 seconds on the left - this means that the workloads were impacted by means of roughly 50%. note that the distribution of the workloads in both diagrams has an identical shape.

the usage of DB2 UDB Throttling

In DB2 UDB V8.1.2, throttling is in particular limited to the BACKUP utility; throttling the REBALANCE utility requires special handling.

Utilities will also be run in both throttled or unthrottled mode. In unthrottled mode, the utility would no longer be under the throttling device and doesn't obey the UTIL_IMPACT_LIM parameter. In throttled mode, that you would be able to definitely assign diverse priorities.

In most instances, DBAs will just run a utility in throttled mode without any special precedence. besides the fact that children the capacity to specify a priority isn't very essential when there aren't loads of utilities that will also be throttled, this components created an infrastructure it is scalable and extensible to support other utilities in future releases (see the DB2 UDB Throttling in "Stinger" section later listed here).

as an instance, right here syntax was delivered to the BACKUP DATABASE command:

On the BACKUP DATABASE command, precedence is an optional flag that represents a bunch in the latitude of 1 to 100, with 100 representing the maximum priority, and 1 representing the lowest precedence. The precedence specifies the volume of throttling to which the utility is subjected. All utilities on the same precedence endure the same amount of throttling, and utilities at lessen priorities are throttled more than these at higher priorities. if you do not specify this alternative, the default precedence is 50. if you invoke the BACKUP utility with out specifying the UTIL_IMPACT_PRIORITY keyword, the utility will execute in unthrottled mode (of path, if the UTIL_IMPACT_PRIORITY key phrase is distinctive, but UTIL_IMPACT_LIM is determined to 100, the utility will run unthrottled).

The REBALANCE utility is invoked not directly from an ALTER TABLESPACE operation. by way of default, the REBALANCE utility is started in unthrottled mode, and a mechanism is provided whereby a DBA can throttle this utility after it has been began.

The skill to make use of the command line processor (CLP) to allow or disable throttling, as well as reprioritize a working utility, is also offered throughout the set command, as follows:

set UTIL_IMPACT_PRIORITY for <utility_id> to <priority>

For the set command, the priority flag performs the same function as specific above; however, if you set it to 0, it is going to force a throttled utility to proceed unthrottled.

in the DB2 UDB V8.1.2 implementation, working dissimilar throttled utilities on the same time isn't supported.

DB2 UDB Throttling in "Stinger"

DB2 UDB "Stinger" has a few enhancements to the throttling capabilities of DB2 UDB (take a look at www.ibm.com/db2/stinger for greater assistance):

  • some of the utilities and coverage settings have been encapsulated within the control center and Wizards.
  • there's an lively utilities monitor to music the popularity of utilities.
  • Snapshots and SQL help for monitoring the progress of executing utilities had been brought.
  • distinct similtaneously operating utilities can also be throttled.
  • The UTIL_IMPACT_PRIORITY clause has been added to the RUNSTATS utility.
  • in regards to the Authors

    Paul C. Zikopoulos, BA, MBA, is with IBM Canada Ltd. Paul has written numerous magazine articles and books about DB2. Paul has co-authored the books: DB2 version eight: The respectable e-book, DB2: The complete Reference, DB2 Fundamentals Certification for Dummies, DB2 for Dummies, and A DBA's ebook to Databases on Linux. Paul is a DB2 certified superior Technical knowledgeable (DRDA and Cluster/EEE) and a DB2 certified options expert (enterprise Intelligence and Database Administration). that you could attain him at: paulz_ibm at msn.com.

    Roman B. Melnyk, PhD, is with IBM Canada Ltd., that specialize in database administration, DB2 utilities, and SQL. Roman has written numerous DB2 books, articles, and different connected substances. Roman co-authored DB2 version 8: The reputable e-book, DB2: The comprehensive Reference, DB2 Fundamentals Certification for Dummies, and DB2 for Dummies. which you can attain him at roman_b_melnyk at hotmail.com.

    IBM reserves the right to include or exclude any features marketed as part of the DB2 UDB "Stinger" release within the ultimate version of this product.


    Hooking Up with IBM DB2 widely wide-spread Database edition 8 using Java | killexams.com Real Questions and Pass4sure dumps

    Like this text? We recommend 

    DB2 UDB provides for JDBC connectivity via a couple of Java classes and interfaces that put in force the JDBC specification. The implementation is called a JDBC driver. DB2 presently presents JDBC drivers called legacy/CLI drivers and the general JDBC driver.

    the usage of the JDBC type 2 DriverFigure 1

    JDBC 2 classification 2 drivers use an OS-specific library to facilitate conversation with DB2. DB2 ships with two distinctive type 2 drivers: the legacy/CLI JDBC driver and the generic JDBC driver. This interaction is illustrated in determine 1.

    determine 1 JDBC class 2 driver implementation: the legacy/CLI JDBC driver.

    The legacy/CLI JDBC driver is equipped within the file db2java.zip which is within the default DB2 installing directory, "c:\application data\IBM\SQLLIB\java".

    in case you are attempting to engage with a far flung database the use of the legacy/CLI JDBC driver, you should use the DB2 Configuration Assistant. under the covers, this driver performs a native join via a native DB2 client. if you have installed a DB2 UDB v8 server, you could have the Configuration Assistant and the leisure of the DB2 product. when you are connecting to a faraway DB2 server, make sure you deploy the DB2 utility development customer or the DB2 Runtime client. These purchasers are downloadable for free at http://www-306.ibm.com/application/records/db2/udb/assist.html.

    For Java construction, the handiest required DB2 software is the runtime client, and it is a lots smaller down load graphic (round 68MB for windows and 200MB for Linux). in case you make a decision that the general JDBC driver in type 4 mode is all you really want, that you can readily replica the db2jcc.jar file and its corresponding license jar file from an latest setting up. These two info would effect in under 1MB of disk area.

    in case you are just getting started with DB2 locally in your own desktop we'd advocate that you simply down load the DB2 very own Developer's version product.

    figure 2 indicates the DB2 Configuration Assistant (db2ca), it can also be used to catalog the DB2 database and the node listing suggestions that can be used by using the JDBC driver to find the DB2 database on a far off server.

    Figure 2figure 2 DB2 Configuration Assistant.

    earlier than you start your endeavors of hooking up to DB2 via Java, it is a good idea to make certain connectivity to your far off database. This will also be executed the usage of the Configuration Assistant, as proven in determine 3.

    Figure 3determine three test the DB2 connection.

    The code of checklist 1 indicates the programmatic entry of the database we created past. be aware that the implementation kit identify is com.ibm.db2.jdbc.app.DB2Driver. checklist 1, 2, and 3 all do the identical component. They effectively retrieve facts from the database we created the usage of a simple SQL question.

    record 1 Use of the legacy/CLI JDBC driver (db2java.zip), a JDBC-class driver to engage with DB2 import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.observation; public category Type2ExampleLegacy public static void leading(String[] args) try // load the DB2 Driver category.forName("COM.ibm.db2.jdbc.app.DB2Driver"); // establish a connection to DB2 Connection db2Conn = DriverManager.getConnection ("jdbc:db2:phoneDB","db2admin","db2admin"); // use an announcement to collect facts from the database observation st = db2Conn.createStatement(); String myQuery = "select * FROM PHONENUMBERS"; // execute the question ResultSet resultSet = st.executeQuery(myQuery); // cycle through the resulSet and monitor what turned into grabbed whereas (resultSet.subsequent()) String name = resultSet.getString("identify"); String phoneNumber = resultSet.getString("phonenumber"); system.out.println("identify: " + name); system.out.println("cellphone number: " + phoneNumber); system.out.println("-------------------------------"); // clean up supplies resultSet.close(); st.shut(); db2Conn.close(); seize (ClassNotFoundException cnfe) cnfe.printStackTrace(); capture (SQLException sqle) sqle.printStackTrace();

    we're assuming that you've a background in JDBC. (If no longer, it should be would becould very well be a good idea to take a glance at articles on this subject matter on the InformIT website.) The simplest change is that they use the distinctive drivers, driver architectures, and syntax to obtain their connectivity. figure 4 indicates the successful execution of the code.

    Figure 4figure 4 successful execution of our pattern code.

    The widespread JDBC driver

    With the advent of DB2 eight.1 got here the new general JDBC driver, which can also be used both in a kind 2 structure or a kind four architecture (see under). In a kind 2 mode, the usual JDBC driver offers local application performance good points (since it avoids using TCP/IP protocol to communicate to the DB2 server). In class 2 mode, there's additionally full support for dispensed transactions. for this reason, if the utility and the DB2 server are on the identical machine, we recommend that you simply use the common JDBC driver in class 2 mode. the driving force is located within the file db2jcc.jar. observe from the code of record 2 that the implementation kit is com.ibm.db2.jcc.DB2Driver. additionally, at runtime, in class 2 mode and effort could be made to load a file named db2jcct2.dll. This file is installed when the Runtime client or application construction client of the product are put in.

    list 2 Use of the universal driver (db2jcc.jar)in a JDBC class 2 setup to engage with DB2. import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.statement; public type Type2ExampleUniversal public static void main(String[] args) try // load the DB2 Driver type.forName("com.ibm.db2.jcc.DB2Driver"); // establish a connection to DB2 Connection db2Conn = DriverManager.getConnection ("jdbc:db2:phoneDB","db2admin","db2admin"); // use a press release to accumulate records from the database statement st = db2Conn.createStatement(); String myQuery = "select * FROM PHONENUMBERS"; // execute the query ResultSet resultSet = st.executeQuery(myQuery); // cycle through the resulSet and display what become grabbed while (resultSet.next()) String name = resultSet.getString("identify"); String phoneNumber = resultSet.getString("phonenumber"); equipment.out.println("name: " + name); gadget.out.println("phone number: " + phoneNumber); device.out.println("-------------------------------"); // clear up materials resultSet.shut(); st.close(); db2Conn.close(); capture (ClassNotFoundException cnfe) cnfe.printStackTrace(); catch (SQLException sqle) sqle.printStackTrace(); the use of the JDBC classification four Driver

    a type four JDBC driver connects directly to the database server the usage of Java. (refer to determine 1 for an illustration of this interaction.)

    In a type 4 setup, no client Configuration Assistant is needed to catalog remote databases as with the classification 2 driver. The same db2jcc.jar file is used for the accepted driver in spite of communication mode (classification 2 or category four). We display a way to connect to our DB2 server in record three. (observe that our implementation kit name is once more: com.ibm.db2.jcc.DB2Driver.)

    At a quick look, it's a bit elaborate to look the difference between the syntax of list 2 (showing the use of the widely wide-spread driver as JDBC class 2 driver) and record three (showing the use of the ordinary driver as a JDBC category 4 driver).

    checklist three Use of the generic driver (db2jcc.jar) in a JDBC classification four setup to engage with DB2. import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.commentary; public classification Type4ExampleUniversal public static void leading(String[] args) try // load the DB2 Driver classification.forName("com.ibm.db2.jcc.DB2Driver"); // set up a connection to DB2 Connection db2Conn = DriverManager.getConnection ("jdbc:db2://localhost:50000/phonedb","db2admin","db2admin"); // use an announcement to collect statistics from the database observation st = db2Conn.createStatement(); String myQuery = "select * FROM PHONENUMBERS"; // execute the question ResultSet resultSet = st.executeQuery(myQuery); // cycle throughout the resulSet and monitor what changed into grabbed while (resultSet.subsequent()) String identify = resultSet.getString("name"); String phoneNumber = resultSet.getString("phonenumber"); equipment.out.println("name: " + identify); gadget.out.println("mobilephone number: " + phoneNumber); equipment.out.println("-------------------------------"); // clear up components resultSet.shut(); st.close(); db2Conn.close(); catch (ClassNotFoundException cnfe) cnfe.printStackTrace(); seize (SQLException sqle) sqle.printStackTrace();

    Let's go over some key adjustments. within the category four driver, our connection URL takes the form jdbc:db2://server1:50000/phonedb (as antagonistic to the kind jdbc:sample). The DB2 server during this case is listening for customer connections on port 50000. here's the default port that DB2 listens to upon setting up unless you specify otherwise.

    additionally, notice that the hostname (server1) and the port number is blanketed in the database connection URL. These (with the port quantity) give the motive force with guidance to connect at once to the database server while not having to reference the database and node catalog entries, as changed into required for the legacy/CLI JDBC driver discussed previous.

    observe that if you are using DB2 UDB V8.1.2 or later versions of the common JDBC driver, you then ought to consist of a license JAR file on your CLASSPATH in addition to the db2jcc.jar file. refer to the DB2 documentation to assess which JAR file to include (this file is used to verify which DB2 server systems you can be able to entry).


    IBM has released 6 new prep tutorials for DB2 Certification | killexams.com Real Questions and Pass4sure dumps

    the new tutorials will train you the fundamentals of the DB2 products and equipment, DB2 protection, and a great deal extra. You should make a FREE registration to view the tutorials.

    here they're:

    DB2 Planning: DB2 V8.1 family Fundamentals certification prep, part 1 of 6

    This tutorial introduces the fundamentals of the DB2 products and tools, along with the ideas of information warehousing and OLAP. it is the first in a sequence of six tutorials designed to assist you prepare for the DB2 UDB V8.1 family unit Fundamentals Certification (examination 700).

    DB2 protection: DB2 V8.1 family Fundamentals certification prep, part 2 of 6

    This tutorial introduces you to DB2 security. you will study DB2 authentication, authorization and privileges. it's the 2nd in a series of six tutorials that you should use to help you put together for the DB2 UDB V8.1 family unit Fundamentals Certification (exam seven hundred).

    having access to DB2 UDB statistics: DB2 V8.1 household Fundamentals certification prep, part three of 6

    This tutorial introduces you to the objects that make up a DB2 database, and to the factors that affect how the database is created. After a quick introduction to DB2 objects, we’ll determine the diverse equipment to create, entry, and manipulate DB2 objects. This tutorial is the third in a series of six tutorials so you might use to support you prepare for the DB2 UDB V8.1 household Fundamentals Certification (examination seven hundred).

    Working with DB2 UDB information: DB2 V8.1 family Fundamentals certification prep, half four of 6

    This tutorial introduces you to Structured question Language (SQL), and helps to offer you an outstanding understanding of how DB2 generic Database uses SQL to outline database objects (reminiscent of tables, views, or indexes) and to manipulate records in a relational database. This tutorial is the fourth in a series of six tutorials so that you can use to help prepare for the DB2 UDB V8.1 family Fundamentals Certification (examination 700).

    Working with DB2 UDB Objects: DB2 V8.1 household Fundamentals certification prep, part 5 of 6

    This tutorial discusses statistics forms, tables, views, and indexes as described by means of DB2 normal Database. It explains the features of those objects, how to create and manipulate them the use of Structured question Language (SQL), and how they will also be used in an utility. This tutorial is the fifth in a series of six tutorials that you should use to support prepare for the DB2 UDB V8.1 family Fundamentals Certification (examination seven hundred).

    statistics Concurrency: DB2 V8.1 household Fundamentals certification prep, half 6 of 6

    This tutorial will introduce you to the conception of statistics consistency and to the various mechanisms which are used via DB2 common Database to keep database consistency in each single- and multi-consumer environments. this is the final tutorial in a collection of six tutorials that you should use to aid prepare for the DB2 UDB V8.1 family unit Fundamentals Certification (exam seven hundred).


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    UDB V8.1 for z/OS Database Administration

    Pass 4 sure 000-702 dumps | Killexams.com 000-702 real questions | [HOSTED-SITE]

    DB2 Universal Data Base V8.1 Certification: Backup and Recovery | killexams.com real questions and Pass4sure dumps

    This chapter introduces you to the backup and recovery tools that are available with DB2 universal database, and to show you how to both backup a database on a regular basis and restore a database if it becomes damaged or corrupted.

    This chapter is from the book 

    Fourteen percent (14%) of the DB2 UDB V8.1 for Linux, UNIX, and Windows Database Administration certification exam (Exam 701) and seventeen percent (17%) of the DB2 UDB V8.1 for Linux, UNIX, and Windows Database Administration certification upgrade exam (Exam 706) exam is designed to evaluate your knowledge of transactions and transaction logging, and to test your ability to backup and restore a database using the various methods of backup and recovery available. The questions that make up this portion of the exam are intended to evaluate the following:

  • Your knowledge of the various transaction logging features available.

  • Your knowledge of the types of database recovery available (crash, version, and roll-forward) and your ability to demonstrate when and how each are used.

  • Your ability to create and use database-level and tablespace-level backup images.

  • Your ability to create and use full, incremental, and delta backup images.

  • Your ability to return a damaged or corrupt database to the state it was in at any given point in time.

  • Your knowledge of how and when invalid indexes are recreated.

  • Your ability to suspend and resume database I/O and your ability to initialize a split mirror copy of a database.

  • This chapter is designed to introduce you to the backup and recovery tools that are available with DB2 Universal Database, and to show you how to both backup a database on a regular basis and restore a database if it becomes damaged or corrupted.

    Note

    Although basic syntax is presented for most of the DB2 UDB commands covered in this chapter, the actual syntax supported may be much more complex. To view the complete syntax for a specific command or to obtain more information about a particular command, refer to the IBM DB2 Universal Database, Version 8 Command Reference product documentation.

    Terms you will learn:

  • Transaction

  • Unit of work

  • COMMIT

  • ROLLBACK

  • Transaction logging

  • Log buffer

  • Circular logging

  • Archival logging

  • Infinite logging

  • Log mirroring

  • Crash recovery

  • Version recovery

  • Roll-forward recovery

  • Transaction failure

  • Recoverable database

  • Non-recoverable database

  • Online backup and recovery

  • Offline backup and recovery

  • RESTART

  • Soft checkpoint

  • BACKUP

  • RESTORE

  • ROLLFORWARD

  • Recovery History file

  • LIST HISTORY

  • PRUNE HISTORY

  • Redirected restore

  • SET TABLESPACE CONTAINERS

  • Invalid index

  • Split Mirror

  • Mirroring

  • Splitting

  • SET WRITE

  • db2inidb

  • Techniques you will master:

  • Recognizing the types of transaction logging available and understanding when each is to be used.

  • Understanding how crash recovery, version recovery, and roll-forward recovery operations are initiated.

  • Understanding how database-level and tablespace-level backup images are made.

  • Understanding how full, incremental, and delta backup images are created and used.

  • Understanding how invalid indexes are recreated.

  • Understanding how split mirroring is used to backup a database.

  • Understanding how I/O is suspended and resumed so mirrors can be split, as well as knowing how split mirrors are initialized.

  • A transaction (also known as a unit of work) is a sequence of one or more SQL operations grouped together as a single unit, usually within an application process. Such a unit is called "atomic" because, like atoms (before fission and fusion were discovered), it is indivisible—either all of its work is carried out or none of its work is carried out. A given transaction can perform any number of SQL operations—from a single operation to many hundreds or even thousands, depending on what is considered a "single step" within your business logic. (It is important to note that the longer a transaction is, the more database concurrency decreases and the more resource locks are acquired; this is usually considered the sign of a poorly written application.)

    The initiation and termination of a single transaction defines points of data consistency within a database; either the effects of all operations performed within a transaction are applied to the database and made permanent (committed), or the effects of all operations performed are backed out (rolled back) and the database is returned to the state it was in before the transaction was initiated.

    In most cases, transactions are initiated the first time an executable SQL statement is executed after a connection to a database has been made or immediately after a pre-existing transaction has been terminated. Once initiated, transactions can be implicitly terminated, using a feature known as "automatic commit" (in which case, each executable SQL statement is treated as a single transaction, and any changes made by that statement are applied to the database if the statement executes successfully or discarded if the statement fails) or they can be explicitly terminated by executing the COMMIT or the ROLLBACK SQL statement. The basic syntax for these two statements is:

    COMMIT <WORK>

    and

    ROLLBACK <WORK>

    When the COMMIT statement is used to terminate a transaction, all changes made to the database since the transaction began are made permanent. On the other hand, when the ROLLBACK statement is used, all changes made are backed out and the database is returned to the state it was in just before the transaction began. Figure 7-1 shows the effects of a transaction that was terminated with a COMMIT statement; Figure 7-2 shows the effects of a transaction that was terminated with a ROLLBACK statement.

    07fig01.gifFigure 7-1. Terminating a transaction with the COMMIT SQL statement.

    07fig02.gifFigure 7-2. Terminating a transaction with the ROLLBACK SQL statement.

    It is important to remember that commit and rollback operations only have an effect on changes that have been made within the transaction they terminate. So in order to evaluate the effects of a series of transactions, you must be able to identify where each transaction begins, as well as when and how each transaction is terminated. Figure 7-3 shows how the effects of a series of transactions can be evaluated.

    07fig03.jpgFigure 7-3. Evaluating the effects of a series of transactions.

    Changes made by a transaction that have not been committed are usually inaccessible to other users and applications (unless another user or application is using the Uncommitted Read isolation level), and can be backed out with a rollback operation. However, once changes made by a transaction have been committed, they become accessible to all other users and/or applications and can only be removed by executing new SQL statements (within a new transaction). So what happens if a problem occurs (for example, a power failure occurs or an application abends) before a transaction's changes can be committed? In order to answer that question, we must first look at how data changes are made and at how transaction activity is logged.


    DB2 Universal Database Support for .NET Development and Concurrent Data Readers | killexams.com real questions and Pass4sure dumps

    by Paul C. Zikopoulos

    Since its Version 8.2.2 release, also known as Fix Pack 9, the IBM DB2 Universal Database product (DB2 UDB) has provided the capability for a concurrent data reader to access more than one result set in the same database connection and query both of those result sets concurrently. You can download this product, which came out in April 2005, at: http://www-306.ibm.com/software/data/db2/udb/support/downloadv8.html. In this article, I want to introduce you to this new feature and show you some sample code that you can use to deliver this powerful functionality to your DB2 UDB applications.

    This sounds a lot like Multiple Active Results Sets (MARS) support SQL Server 2005 release… How did DB2 UDB manage to do this so early?

    Microsoft refers to what I am calling Concurrent Data Readers as Multiple Active Result Sets (MARS). MARS is actually more than this, but this is the crux of the new feature scheduled for SQL Server 2005.

    All the DB2 UDB family servers have fully supported having multiple statements open per connection for a very long time. The type of statement is irrelevant (SELECT, INSERT, UPDATE, or DELETE). Given the nature of SELECT, INSERT, UPDATE, and DELETE statements, it is easier to have multiple cursors open where the application can alternate fetches between two cursors to show they are concurrent.

    SQL Server 2000 has been unable to have more than a single statement open at a time on a connection. If you exceeded this restriction, an open cursor would block out all other statements, not just other cursors.

    In SQL Server 2005, Microsoft appears to have changed their model (with their M.A.R.S. feature) to enable multiple statements on a single connection. This implementation was done by adding an abstract layer (session) between the connection and the statement, which may indicate a potential overhead cost to having multiple sessions opened.

    To enable this support in DB2 UDB, the IBM development teams did not have to address the same limitations that the Microsoft teams apparently faced, so they could deliver this feature quickly in response to customer demand. In fact, enabling this feature in DB2 UDB was as simple as removing the client side restriction that stood in the way of externalizing this support. The CLI, JDBC, and SQLJ interfaces in DB2 UDB, for example, have had this support for years.

    Keep in mind that this capability is not a panacea: there are costs to having multiple statements executing. However, in the DB2 UDB case, associated overhead seems very limited in my tests. Of course, I will give the usual advice about holding any locks held until a statement is closed, but that is business-as-usual and not specific to using multiple active statements at the same time.

    Concurrent Data Readers in DB2 UDB Version 8.2.2 or later

    The concurrent data reader support in DB2 UDB enables an application to access more than one result set over the same database connection and query them concurrently. Prior to V8.2.2, each database connection could only support one open result set on a connection at any one time.

    Quite simply, this feature delivers the capability for your applications to have multiple DB2DataReader objects open on a connection at the same time when each instance of the DB2DataReader is started from a separate command. This will also enable common language runtime (CLR) stored procedures – supported in the DB2 UDB product since September 2004 - to return multiple result sets too.

    Concurrent data reader capability is not just limited to the DB2 UDB product running on Linux, UNIX, or Windows operating systems. In fact, this new capability can be extended to support the entire DB2 UDB family - although you will need the DB2 Connect product to support this feature with DB2 UDB for z/OS and DB2 UDB for i5/OS databases.

    The following code snippet shows an example of opening more multiple DB2DataReader objects on a connection at the same time:

    //Open connection to the database DB2Connection conn = new DB2Connection ("database=sample;"); conn.Open(); //Create 2 commands from the same connection DB2Command cmd1 = conn.CreateCommand(); DB2Command cmd2 = conn.CreateCommand(); cmd1.CommandText = "SELECT SALES_PERSON, SALES FROM SALES"; cmd2.CommandText = "SELECT DEPTNUMB, DEPTNAME FROM ORG" //Execute the first query DB2DataReader dr1 = cmd1.ExecuteReader(); //Execute the second query while the first one is still open DB2DataReader dr2 = cmd2.ExecuteReader(); //Get results from both data readers while (dr1.Read()) { Console.WriteLine(" Sales Person {0}, Sales {1}" dr1.GetString(0), dr1.GetInt16(1)); } while (dr2.Read()) { Console.WriteLine(" Department Number {0}, Department Name {1}" dr2.GetInt16(0), dr2.GetString(1)); } //Close both data readers dr1.Close(); dr2.Close(); conn.Close(); Of course, you will use the DB2 UDB plug-ins for Visual Studio .NET and the DB2 UDB SQL editor to work with this code. (It provides IntelliSense links to the underlying database schema, collapsible regions, syntax colorization, and more.) I included the code snippet so that you could copy and paste the code for yourself.

    An example of this code in the integrated DB2 SQL editor for Visual Studio .NET is shown below:

    In the first section of this code sample (1), you can see that the connection to the SAMPLE database is defined and opened. (It is using the default credentials that the user used to log on to the Windows operating system in this case.)

    After setting up the connection, two separate command objects (2,3) are instantiated – each a simple SELECT statement from the SAMPLE database that comes with DB2 UDB. If you do not have the SAMPLE database created on your system, you can quickly create it by entering the db2sampl command on your operating system's command prompt.

    Now it is time to execute each query (4,5), but note I have only created one connection. Once each query has been run, the results of each command, which was run from separate data readers on the same connection (6), are returned to the console application.

    Of course, like a good developer, you close up your readers and connections (7), and your application is finished.

    Wrapping it all up

    In this article, I showed you how you can leverage the ability for DB2 UDB V8.2.2 to execute multiple reader commands on a single database connection. As previously stated, you have likely heard of this feature known as MARS in the .NET context through advertisements for the SQL Server 2005 release. The similar concept of performing different reads on the same database connection in DB2 UDB does not have the inherent complexities that seem to come with the MARS programming model in SQL Server 2005.

    Concurrent data reader support, along with other features in the SQL Server 2005 and Visual Studio .NET 2005 release (CLR stored procedures, database projects, and more) are prime examples of just how sophisticated the support for .NET applications is in DB2 UDB today! From the tooling to the provider, DB2 UDB and .NET are a dynamic combination!

    Ready to try it out for yourself? Get a free trial copy of a DB2 UDB for Windows Server at: www.ibm.com/software/data/db2/udb/support/downloadv8.html. You can also get a free copy of DB2 UDB Personal Edition for development purposes at: http://www14.software.ibm.com/webapp/download/search.jsp?go=y&rs=db2udbpde.

    About the Author

    Paul C. Zikopoulos, BA, MBA, is an award-winning writer and speaker with the IBM Database Competitive Technology team. He has more than ten years of experience with DB2 UDB and has written over sixty magazine articles and several books about it. Paul has co-authored the books: DB2 Version 8: The Official Guide, DB2: The Complete Reference, DB2 Fundamentals Certification for Dummies, DB2 for Dummies, and A DBA's Guide to Databases on Linux. Paul is a DB2 Certified Advanced Technical Expert (DRDA and Cluster/EEE) and a DB2 Certified Solutions Expert (Business Intelligence and Database Administration). In his spare time, he enjoys all sorts of sporting activities, running with his dog Chachi, and trying to figure out the world according to Chloë – his new daughter. You can reach him at: paulz_ibm@msn.com.

    Trademarks

    IBM, DB2, DB2 Connect, DB2 Universal Database, i5/OS, and z/OS are trademarks or registered trademarks of International Business Machines Corporation in the United States, other countries, or both.

    Java and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both.

    Microsoft and Windows are trademarks of Microsoft Corporation in the United States, other countries, or both.

    UNIX is a registered trademarks of The Open Group in the United States and other countries.

    Linux is a trademark of Linus Torvalds in the United States, other countries, or both.

    Other company, product, and service names may be trademarks or service marks of others.

    Copyright International Business Machines Corporation, 2005. All rights reserved.

    Disclaimer

    The opinions, solutions, and advice in this article are from the author's experiences and are not intended to represent official communication from IBM or an endorsement of any products listed within. Neither the author nor IBM is liable for any of the contents in this article. The accuracy of the information in this article is based on the author's knowledge at the time of writing.


    Software Tools support UDB for z/OS v8. | killexams.com real questions and Pass4sure dumps

    Press Release Summary:

    DB2® Software Tools assist database administrators and system programmers in managing many aspects of DB2 database environments. Four products include DB2 Administration Tool for z/OS V5, DB2 Object Comparison Tool for z/OS V3, DB2 Utilities Suite for z/OS V8, and DB2 Bind Manager for z/OS V2.2.

    Original Press Release: IBM DB2 Tools for z/OS Support DB2 Universal Database for z/OS, V8

    OverviewFour enhanced DB2® tools are added to the list of tools supporting DB2 Universal Database® (UDB) for z/OS® , V8. These tools offer many innovative features to assist database administrators (DBAs) and system programmers in managing many aspects of DB2 database environments.o DB2 Administration Tool for z/OS, V5o DB2 Object Comparison Tool for z/OS, V3o DB2 Utilities Suite for z/OS, V8o DB2 Bind Manager for z/OS, V2.2

    For the most recent news about DB2 Tools compatibility with DB2 UDB for z/OS, V8, visit the DB2 and IMS(TM) Tools Web site athttp://www.ibm.com/software/data/db2imstools/support.html

    Information you will find on this page includes a compatibility matrix with notes regarding any required service.

    The DB2 and IMS Tools business is a unique model in the industry. IBM continues to increase its investment in tools to deliver comprehensive solutions that meet requirements faster than ever before. Increased focus is on common interfaces, cross-tool integration, and testing with the same criteria used for the databases.

    Key prerequisitesAny hardware configuration that supports the required versions of DB2. Details are listed in the Hardware requirements andSoftware requirements sections.

    Planned availability dateso March 26, 2004: DB2 Utilities Suite for z/OS, V8o April 9, 2004: DB2 Bind Manager for z/OS, V2.2o April 30, 2004:- DB2 Administration Tool for z/OS, V5- DB2 Object Comparison Tool for z/OS, V3

    At a glanceFour enhanced DB2 tools support DB2 V8 and offer additional capabilities in key functional areas:o Database Administration- DB2 Administration Tool for z/OS, V5- DB2 Object Comparison Tool for z/OS, V3o Utilities Management- DB2 Utilities Suite for z/OS, V8o Application Management- DB2 Bind Manager for z/OS, V2.2

    For ordering, contact:Your IBM representative, an IBM Business Partner, or the Americas Call Centers at 800-IBM-CALL Reference: LE001

    Related Thomas Industry Update Thomas For Industry


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    IBM 000-702 Exam (UDB V8.1 for z/OS Database Administration) Detailed Information



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