ORA-01555: snapshot too old with manual undo - Causes and Solutions
Last updated on AUGUST 25, 2017
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [Release 8.1.7 to 11.1]
Information in this document applies to any platform.
***Checked for relevance on 21-Jul-2017***
A transaction fails with an ORA-01555 error.
ORA-01555: snapshot too old (rollback segment too small)
Cause: rollback records needed by a reader for consistent read are overwritten by other writers
For additional information and specific information for ORA-1555 with automatic UNDO, please refer to:
Note 1307334.1 - Master Note for ORA-1555 Errors
Note 467872.1 - TROUBLESHOOTING GUIDE (TSG) - ORA-1555
Note 269814.1 - ORA-01555 Using Automatic Undo Management - Causes and Solutions
Sign In with your My Oracle Support account
Don't have a My Oracle Support account? Click to get started
My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms