Query on dba_segments view takes too long time
Last updated on JULY 17, 2017
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]Information in this document applies to any platform.
Symptoms
- Query on dba_segments view takes too long time on a database that has lots of subpartitions
- When looking at an 10046 trace, it takes time at I_INDSUBPART_POBJSUBPART$, one of indexes of table INDSUBPART$, for example:
Changes
Sub-partitions were created in the database but Statistics for dictionary have not been collected. Automatic optimizer statistics collection(auto task of 'auto optimizer stats collection') was disabled to collect statistics of tables manually.
Cause
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