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 later
Information in this document applies to any platform.

+ 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.

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In this Document

Symptoms

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