ORA-01555 for long running queries if "_undo_autotune"=true
(Doc ID 2784427.1)
Last updated on JUNE 14, 2021
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 and laterInformation 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.
Cause
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In this Document
Symptoms |
Cause |
Solution |
References |