DBMS_STATS.GATHER_DICTIONARY_STATS is Stuck on "SYS"."WRH$_ACTIVE_SESSION_HISTORY" and is Taking a Very Long Time
(Doc ID 2046826.1)
Last updated on MAY 23, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.2 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- A large database was upgraded (RAC or non-RAC) with large AWR repository
- DBMS_STATS.GATHER_DICTIONARY_STATS() command was ran and took many hours without generation of data dictionary statistics
- Stats gathering seems to be stuck in following command on "SYS"."WRH$_ACTIVE_SESSION_HISTORY" table as per 10046 event tracing at level 12 on the session:
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |