Encountering Slow Performance Reading *_SEGMENTS or *_TS_QUOTAS
(Doc ID 1491748.1)
Last updated on MARCH 03, 2022
Applies to:
Oracle Database - Standard Edition - Version 10.2.0.5 to 12.1.0.1 [Release 10.2 to 12.1]Oracle Database - Personal Edition - Version 10.2.0.5 to 12.1.0.1 [Release 10.2 to 12.1]
Oracle Database - Enterprise Edition - Version 10.2.0.5 to 12.1.0.1 [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
Symptoms
- 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:
Changes
This may be seen after upgrading to Oracle Database 11.2 and may get worse over time.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |