Encountering Slow Performance Reading *_SEGMENTS or *_TS_QUOTAS
(Doc ID 1491748.1)
Last updated on MAY 19, 2020
Applies to:Oracle Database - Standard Edition - Version 10.2.0.5 to 220.127.116.11 [Release 10.2 to 12.1]
Oracle Database - Personal Edition - Version 10.2.0.5 to 18.104.22.168 [Release 10.2 to 12.1]
Oracle Database - Enterprise Edition - Version 10.2.0.5 to 22.214.171.124 [Release 10.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform.
View affected include: DBA_SEGMENTS, USER_SEGMENTS, DBA_TS_QUOTAS, USER_TS_QUOTAS
- Queries on DBA_SEGMENTS or USER_SEGMENTS involving the columns BYTES, BLOCKS, or EXTENTS are very slow.
- Queries on DBA_TS_QUOTAS or USER_TS_QUOTES on columns BYTES or BLOCKS are also slow.
- You have tablespaces using LOCAL extent management and MANUAL segment space management.
- If you perform the following query, you will find that a large number of segments (probably in the 1000s or more) are listed as SLOW_SEGS:
This may be seen after upgrading to Oracle Database 11.2 and may get worse over time.
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