How to fix the Oracle error ORA-01555: snapshot too old: rollback segment number string with name “string” too small?

In this post, you’ll learn more about the Oracle ErrorORA-01555: snapshot too old: rollback segment number string with name “string” too small with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01555: snapshot too old: rollback segment number string with name “string” too small

Reason for the Error ORA-01555: snapshot too old: rollback segment number string with name “string” too small

rollback records needed by a reader for consistent read are overwritten by other writers

How to fix the Error ORA-01555: snapshot too old: rollback segment number string with name “string” too small ?

You can fix this error in Oracle by following the below steps

If in Automatic Undo Management mode, increase undo_retention setting. Otherwise, use larger rollback segments