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Troubleshooting ORA-01555 - Snapshot Too Old: Rollback Segment Number "String" With Name "String" Too Small (Doc ID 1580790.1)

Last updated on MARCH 12, 2021

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Purpose

This document provides troubleshooting steps to resolve ORA-01555 / ORA-22924. It also discusses known issue and bugs related ORA-01555 / ORA-22924.

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 1) Check Error Messages:
 a) Identify segment name:
 1. LOB segment corruption:
 2. If no LOB corruption found, so Issues with Retention/Pctversion values :
 b) Identify Query Duration:
 2) Check Undo Datafiles :
 3) TUNED_UNDORETENTION :
 4) High utilization of ACTIVE/UNEXPIRED extents :
 5) UNDO_RETENTION :
 6) 1555 error during export :
 7) How to find the complete SQL statement caused ORA-1555 :
References

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