@Srinivas K
You're welcome, Given that the issue is intermittent and not due to manual inserts, it could indeed be related to the distribution method used in your Synapse table. Here are a few points to consider:
- HASH Distribution: This method distributes rows based on the hash value of a specified column. While it helps in evenly distributing data, it can sometimes lead to issues if the hash function doesn't distribute values uniformly.
- Round Robin Distribution: This method distributes rows evenly across all distributions without considering the values in any particular column. It is simpler but might not be optimal for large tables with frequent joins.
- Check Distribution Key: Ensure that the distribution key chosen for HASH distribution is appropriate and results in an even distribution of data.
- Use Unique Constraints: Implement unique constraints or primary keys on the ID column to enforce uniqueness.
- DBCC CHECKIDENT: Use the
DBCC CHECKIDENT
command to check and correct the identity value if it gets out of sync.
- Review Insert Logic: Double-check the logic used for inserting data from multiple sources to ensure there are no conflicts or race conditions.
- Logs and Monitoring: Enable detailed logging and monitoring to capture the exact scenarios when duplicates are inserted. This can help in identifying any patterns or specific conditions leading to the issue.
If the issue persists, do let us know
For more detailed guidance refer to the official documentation