Exalytics and Oracle In-Memory Database: Query Performance and Hard Parse Times Longer than Expected (Doc ID 2099375.1)

Last updated on JANUARY 22, 2016

Applies to:

Oracle Exalytics Software - Version 1.0.0.4.0 and later
Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

When using Oracle Database In-Memory 12.1.0.2 (IMDB) on an Oracle Exalytics server, the query performance is less than expected.
For example, if setting optimizer_features_enable:

Setting it to optimizer_features_enable='12.1.0.1' improves query performance (< 1 second).
Resetting it to optimizer_features_enable='12.1.0.2' slows query performance (7 - 10 seconds)

Expecting performance to be better with 12.1.0.2 than it is with 12.1.0.1, but explain plan shows longer time in the hard parse phase.

Cause

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