CV853G Db2 12 for z/OS Introduction to System
The DB2 LUW database uses EXPLAIN PLAN FOR to generate an execution plan. Our LAST_EXPLAINED view fromats it nicley. IBM® DB2® for z/OS® customers expect improved performance in each release EXPLAIN or used for statement-level optimization hints or options (which are Understand new EXPLAIN capabilities, added in DB2 10 and 11, and “IBM DB2 11 for z/OS Performance Topics” (redbook), SG24-8222-0. “DB2 11 for z/OS Want to understand how to execute and understand a Db2 Explain? Want to know what it takes to get optimal performance out of queries, programs, and Generate Explain Plans. The explain plan displays the steps a database uses to execute an SQL statement.
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implement a DB2 database. use stored procedures and triggers. resource serialization, locking and concurrency; use DB2's security and authorization mechanisms to control access to the DB2 data.
Db2 12 for z/OS Introduction to System Administration
DB2 10 for z/OS has added a new keyword to the EXPLAIN option of the BIND PACKAGE command; EXPLAIN (ONLY). Yup, you can now “bind” a package, specifying EXPLAIN (ONLY) option, populating the explain tables only, at the cost of an additional BIND of course, without having any affect on the current existing package. –Any level of Db2 Connect drivers should work with Db2 12 for z/OS, both before and after new function is activated with no behavior change –Data server clients and drivers must be at the following levels to exploit Db2 for z/OS function-level application compatibility of Db2 for z/OS FL=V12R1M501or greater:
If you do, you might be one of those who likes to retrieve access plan information by querying the PLAN_TABLE into which DB2 inserts rows when a SQL statement is EXPLAINed (either dynamically via the EXPLAIN statement or, for embedded static SQL, as part of the program bind process when EXPLAIN (YES) is included in the BIND command); or, you might prefer to view EXPLAIN data in the form of an access plan graph generated by a tool such as IBM's Optimization Service Center for DB2 for z/OS
This course is intended for z/OS system administrators, database administrators, or other technical individuals who will be managing Db2 12 for z/OS.
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2013-07-17 Best Practices for DB2 on z/OS Performance … nicht ganz frisch, aber trotzdem noch gut!
– BIND / REBIND with EXPLAIN(ONLY) added. DB2 10 added catalog support for the inactive “copies” of a package. CA-Defined Explain Profiles in CA Plan Analyzer for DB2 for z/OS - YouTube.
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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. It will take you through a process which will generate the explain, as well as recommend any tuning opportunities it can determine.