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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 DECEMBER 06, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


- 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


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