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Why Is Error ORA-01555 Reported During Migration from Oracle to DWS?
Updated on 2023-06-21 GMT+08:00
Why Is Error ORA-01555 Reported During Migration from Oracle to DWS?
Symptom
Error ORA-01555 is reported during data migration from Oracle to DWS.
Fault Analysis
- Each table contains an average of 200 to 500 million data records. Source data is updated every 10 minutes.
- CDM does not support real-time migration but supports scheduled migration. As the source data is updated every 10 minutes, the source database has been updated before the migration job is complete, resulting in a rollback timeout.
- If the entire table is queried during data migration and the query takes a long time, other users frequently perform the commit operation during the query, and the RBS of the Oracle database is small.
Solution
There are three solutions:
- Reduce the data volume queried each time.
- Increase the RBS of the Oracle data.
- Reduce frequent commit operations. This requires adjustment of the production service logic, which is almost impossible.
Parent topic: Troubleshooting
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