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ORA-01555: snapshot too old: rollback segment

in Database - RAC/Scalability (MOSC) 1 commentAnswered

Oracle 19.20 - four node RAC - on Linux 7

We are getting error, "ORA-01555: snapshot too old: rollback segment ". It does not make sense to increase the undo tablespace since it fails during the busy time as low activity time.

Info:

Last week the load ran good without any issue. the job always runs at 8 a.m. everyday.

This week, it is failing with this error.

we tried running this job during different time of the day but got the same error.

The undo space is 340 gb for each instance.

undo_retention = 28,800(8 hours)

Question:

How could I fix this issue?

Is there way to figure out which process causing the issue?

Tagged:

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