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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 later
Oracle 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


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