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Instead, you can use the CURRENT EXPLAIN MODE special register to determine the behavior for eligible dynamic SQL statements during application execution. 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 recent versions of Db2 - specifically, Db2 Version 8, Db2 10 and Db2 12. 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. Disclaimer: This Db2® 12 for z/OS Reference Guide was developed to help users in their daily activities in administrating and programming in Db2 for z/OS.

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Between higher granularity and better separation, DB2 10 for z/OS helps to make your data more secure. Participants should have the following knowledge and skills. Understanding of the objects (such as databases, table spaces, tables, indexes, and so forth) used in a Db2 subsystem. Basic knowledge of SQL. At least one year as a z/OS systems programmer or equivalent knowledge.

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An IBM Redbooks   Explain DB2 concepts, terminology and components; SELECT rows of data from DB2 tables using the WHERE clause to retrieve specific rows; Format QMF  Db2 SQL Debug - execute and explain SQL inside application programs; Db2 Query Build - build complicated SQL SELECT statements; Db2 Catalog Guide -  Query Workload Tuner for Db2 z/OS Expert Advice on query and workload performance for Db2 for z/OS Develop, Run SQL scripts, EXPLAIN and Tune. Jul 12, 2010 Do you use EXPLAIN output when you're analyzing the performance of a query in a DB2 for z/OS environment? I hope so. If you do, you might  Important It is best to convert EXPLAIN tables to Db2 11 format during migration, table space types, see Table space types and characteristics in Db2 for z/OS. This release of DB2 for z/OS includes new and changed commands. changes that affect performance and changes to monitoring tools, such as EXPLAIN.

Hi, on Db2 for z/OS David Simpson – BIND / REBIND with EXPLAIN(ONLY) added. DB2 10 added catalog support for the inactive “copies” of a package. The DB2 LUW database uses EXPLAIN PLAN FOR to generate an execution plan. Our LAST_EXPLAINED view fromats it nicley.
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BIND PACKAGE with option. EXPLAIN(YES). LUW. Explain the allocation CLIST used at logon for DB2 data sets · Use Set SYSPARM command · Locate the Command recognition character for the DB2 subsystem  Feb 6, 2012 Posted February 6, 2012 Willie's "Getting the Most Out of DB2 for z/OS" blog and " Musings of a Life-long Mainframe Guy" blog. The last time I  Jan 9, 2020 When i try to get Explain plan, the menu item is grayed out.

IBM Silicon Valley SQL EXPLAIN. EXPLAIN PLAN SET QUERY=nnn sql_statement. DB2 uses multiple approaches to generate and display execution plans. Generate the execution-plan records with the SQL statement EXPLAIN PLAN FOR In operating systems other than Unix, you can try similar tricks or you can always& Jun 15, 2016 Themis instructor Linda Claussen takes you through the "extra" information you get as part of an Explain in DB2 11 for z/OS. Few results after performing EXPLAIN on an SQL query are confusing to me. This knowledge exists in the Db2 for z/OS Optimizer Development team. You can use the EXPLAIN statement to determine the access paths for the such as IBM® Data Server Manager and related Db2 Tools for z/OS® solutions to   Jul 15, 2012 DB2 10 for z/OS Explain Table Conversion required!
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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. 2012-06-13 DB2-z/OS-DBA‎ > ‎ How to read PLAN_TABLE after EXPLAIN. Hi, Here are some information you should be looking at various columns of the PLAN_TABLE. This will help you analysing the SQL queries and it's various attributes.
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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. The effective use of monitoring and tuning tools is an integral part of all tuning topics throughout the course. This course is appropriate for Db2 for z/OS environments up to and including Db2 12 for z/OS. DB2 z/OS Visual Explain Plan | New Features - Version 16.0 | Aqua Data Studio | AquaClusters DB2 for z/OS: Thoughts on History and Archive Tables I'll state up front that I'm using the terms "history table" and "archive" table not in a generic sense, but as they have technical meaning in a DB2 for z/OS context. Themis instructor Linda Claussen takes you through the "extra" information you get as part of an Explain in DB2 11 for z/OS. 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.