Db2 12 for z/OS Introduction to System Administration

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Output from EXPLAIN: DB2 inserts one or more rows of data into a plan table and other existing EXPLAIN tables. For a list of all EXPLAIN tables, see EXPLAIN tables. A plan table must exist before the operation that results in EXPLAIN output. You can find a sample CREATE TABLE statement for each EXPLAIN table in member DSNTESC of the prefix. The EXPLAIN functionality of Db2 for z/OS, by which the query optimizer's access path determinations are externalized, has been around as long as I can remember, and Db2 people, by and large, are familiar with the concept. In recent weeks, however, I discovered that there is some lack of awareness of EXPLAIN enhancements delivered through more DB2 10 for z/OS Explain Table Conversion required!

DB2-z/OS-DBA‎ > ‎How to EXPLAIN your SQL query‎ > ‎ Performance Consideration of SQL and Index for DB2 on z/OS. Hi, Here is Prakash Back This is with interesting one which is related to Performance which is one of my favorite topic. This course examines and explains the critical factors that affect Db2 for z/OS performance from a systems perspective. The effective use of monitoring and tuning tools is an integral part of all tuning topics throughout the course.

You can find a sample CREATE TABLE statement for each EXPLAIN table in member DSNTESC of the prefix. For joins of tables, EXPLAIN indicates the join method and type, the order in which Db2 joins the tables, and the occasions when and reasons why it sorts any rows.

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DSN_FUNCTION_TABLE. & a bunch of “other” tables. BIND PACKAGE with option. EXPLAIN(YES).

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resource serialization, locking and concurrency; use DB2's security and authorization mechanisms to control access to the DB2 data. use DB2's Explain facility to view and optimize DB2 data access paths.

Before you can use EXPLAIN, you must create a plan table to hold the results of EXPLAIN. The EXPLAIN functionality of Db2 for z/OS, by which the query optimizer's access path determinations are externalized, has been around as long as I can remember, and Db2 people, by and large, are familiar with the concept. In recent weeks, however, I discovered that there is some lack of awareness of EXPLAIN enhancements delivered through more DB2 10 for z/OS Explain Table Conversion required! Each new release of DB2 introduces new columns or modifies existing columns in the EXPLAIN tables. DB2 has traditionally honored EXPLAIN tables in previous release formats, but it is best practice to use the current-release format in order to gather maximum benefit from your EXPLAIN data. These cookies are necessary for the website to function and cannot be switched off in our systems.
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Each row in an EXPLAIN table describes some aspect of a step in the execution of a Output from EXPLAIN: DB2 inserts one or more rows of data into a plan table and other existing EXPLAIN tables. For a list of all EXPLAIN tables, see EXPLAIN tables. A plan table must exist before the operation that results in EXPLAIN output.

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This is done with an entry in the cfg file (db2390.cfg) - see the explain entries near the bottom. This course examines and explains the critical factors that affect Db2 for z/OS performance from a systems perspective.

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The new EXPLAIN privilege provided by DB2 10 for z/OS is tailor-made for the situation you're facing. A user (a programmer, for example) with this privilege can successfully EXPLAIN SQL statements without having the privileges needed to actually execute the statements. To generate the explain graph - simply highlight your query, right click, and choose "Open Visual Explain": To use the query advisor , choose "start tuning" instead.

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I am not sure this is related to that we use V7 and the product has been designed for V8 database. 2020-11-13 Both of the above scenarios are huge fails that DB2 10 for z/OS has a solution for. DB2 10 introduces a new privilege called EXPLAIN. By granting the EXPLAIN privilege on an authid or role, you are giving that authid or role the ability to do an EXPLAIN on an SQL statement specifying the keywords Themis instructor Linda Claussen takes you through the "extra" information you get as part of an Explain in DB2 11 for z/OS. DB2 10 for z/OS. Agenda: Start and stop the DB2 subsystem Use the DB2 Catalog to monitor authorizations Explain the allocation CLIST used at logon for DB2 data sets Increase the size of the Active Log data sets Use Set SYSPARM command Explain DB2 Logging Locate the Command recognition character for the DB2 Use SET LOG SUSPEND and SET LOG RESUME Monitor, explain and alert upon all dynamic SQL in your Db2® for z/OS® systems Monitoring, explanations and alerts for all dynamic SQL executed in Db2 Whether it comes from an in-house development team or a software product, dynamic SQL has become increasingly more important, and the common usage of dynamic SQL impacts Db2 performance.

use the DB2 Catalog to monitor database performance. 2007-12-13 CA RC/Query for DB2 for Z/OS : Quick Explain -206, ERROR: FUNCTION_LVL IS NOT VALID IN THE CONTEXT WHERE IT IS USED book Article ID: 204424. calendar_today Updated On: Products. CA Plan Analyzer for DB2 for z/OS CA Database Management for DB2 for z/OS - Performance Suite CA RC/Query for DB2 for z/OS. Show More Show Less. Db2 for z/OS CHAR versus VARCHAR, Part 2 - a DBA's Story.