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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on May 17, 2019

RELATED IDEAS

Recover Statistics based on Statistic History Tables

See this idea on ideas.ibm.com

In most cases an up-to-date RUNSTATS will result in better execution plans and SQL performance. But there are also cases, where new statistics result in worser execution plans and performance. For static SQL we have many possibilities to control the behaviour.

For dynamic SQL we haven't. Also the new Db2 V12 feature "dynamic plan stability" provides a overall solution. Because statements must be stabilized before out of the statement cache. And within the cache maybe there are some statements missing or changing (using literals). So stablisation for us don't makes sence for a huge range of SQLs. Instead we like to get the opportunity, in cases, where RUNSTATS decreases our execution plans, to recover old statistics from the statistic history tables.

Today, 3rd party vendors already offer such functionality.

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