Error code
Oracle ORA-01555
ORACLEORA-01555
Database Error Code· An error code returned by a database server such as PostgreSQL or MySQL.
What it means
snapshot too old — the undo segment needed to reconstruct an old version of a row has been overwritten.
How to fix it
- Increase the UNDO_RETENTION parameter to retain undo data longer.
- Use the GUARANTEE RETENTION option on the undo tablespace if undo space allows.
- Optimize or break up long-running queries so they complete before undo is recycled.
Not affiliated with Oracle. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More Oracle codes
- ORA-00001unique constraint violated — duplicate value in unique index
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