ORA-01555 for long running queries
(Doc ID 2784427.1)
Last updated on FEBRUARY 28, 2025
Applies to:
Gen 2 Exadata Cloud at Customer - Version N/A and laterOracle Database - Enterprise Edition - Version 12.1.0.2 and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.
Symptoms
+ This is Oracle Database 12.1.0.2.
+ The undo_retention is set high enough (i.e: to 50,000 seconds).
+ Despite of having plenty of expired extents in the undo tablespace, the tuned undo retention drops down to around 5318 seconds for no good reason.
+ The failing queries are long running ones but always with duration that is less than the undo retention setting.
Changes
No changes
Cause
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In this Document
Symptoms |
Changes |
Cause |
Solution |
References |