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Status Not under consideration
Workspace Db2
Created by Guest
Created on Nov 27, 2017

Consideration of Statistical Views for INSERT with Sub-SELECT

We try to improve the performance on an INSERT with an underlying complex subselect eg. "INSERT INTO table "
Therefore we created a statistical view through which the optimizer should be able to get more distribution statistics and build a better access plan for the SELECT statement.
When we explain the SELECT part of the INSERT Statement on its own we can see appropriate Explain Diagnostic messages EXP0148W and EXP0147W that the statistical view is considered and used. Also the SELECT Statement performs significantly better.

However the performance for the INSERT with Sub-Select does not change. If we do an explain for the whole INSERT with Sub-Select we get this diagnostic message:
"EXP0080W The current usage of the statement or the statement containing update, delete or insert or constructs like sampling limits MQT matching."

This topic was subject of IBM Case TS000011478.