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ORA-01555 When Max Query Length Is Less Than Undo Retention, small or 0 Seconds (Doc ID 1131474.1)

Last updated on JUNE 25, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.2.0.2 [Release 10.2 to 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.4 [Release 11.2]
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms


Symptoms:
- A job or process is consistently giving ORA-1555 errors.
- Increasing the undo_retention value has not stopped the errors.
- The ORA-1555 occurs even if there are no other jobs/processes updating the objects reported in the failed SQL.
- The datafiles for the undo tablespace have autoextend turned on, and the file size is less than MAXBYTES.
- A look at the v$undostat shows that the query length is less than both the undo_retention and the tuned_undoretention

Cause

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In this Document
Symptoms
Cause
Solution
References


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