Last updated on JULY 21, 2017
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [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
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