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Status Not under consideration
Workspace Db2
Created by Guest
Created on May 7, 2019

db2caem should support 'SET CURRENT QUERY OPTIMIZATION = N'

For diagnostic of Db2 performance problems the tool   db2caem   can be very helpful. Especially if a particular query plan should be compared using different optimization levels.

Using  db2caem  the optimization level must be specified by embedded optimization guidelines, the (often used) SET CURRENT QUERY OPTIMIZATION = N does not work. It raises the following error.

DBT7033E "db2caem": The db2caem utility encountered an error while processing the specified SQL statement. SQL statement: "set current query optimization = 0". Return code: "-1:4014".

It would be very helpful if   db2caem   would be able to handle 'SET CURRENT QUERY OPTIMIZATION = N' statements.

Needed by Date Sep 30, 2019
  • Guest
    Jul 11, 2019

    CURRENT QUERY OPTIMIZATION, and any other special register settings that affect SQL statement compilation, can be provided using the compilation environment file that is specified with the db2caem -compenv option. That being said, I recognize that this is incredibly ugly and painful to use, so I think we should accept a general request to have db2caem accept a set of SQL statements to execute to set aspects of the compilation environment, or perform any other prerequisite processing, prior to the collection of actuals for the subject statement.