ORA-1555 reported inspite of high undo_retention and enough UNDO space. (Doc ID 1574714.1)

Last updated on DECEMBER 06, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.

Symptoms

ORA-1555 is being reported inspite of high values set for the undo_retention and enough space in the UNDO tablespace.

o setting "_smu_debug_mode" = 33554432 didn't help.
o Tried many settings for UNDO_RETENTION, also didn't work.

Cause

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