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Any idea about
ORA-1555: snapshot too old: rollback segment number
I am getting this error and nothing seems to be wrong. Please state under what conditions in may occur and how it can be avoided?
I suggest you read Tom’s answer :
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1441804355350
“The ORA-1555 happens when people try to save space typically. They’ll have small
rollback segments that could grow if they needed (and will shrink using OPTIMAL). So,
they’ll start with say 10 or so 1meg rollback segments. These rollback segments COULD
grow to 100meg each if we let them (in this example) however, they will NEVER grow unless
you get a big transaction.
“