PostgresDB 40001: Serialization failure

What is PostgresDB 40001: Serialization failure

When encountering the error 40001: Serialization failure in a Postgres DB, the recommended immediate actions are:

Retry the Transaction: Often, simply retrying the transaction can resolve the issue, especially if it's due to a temporary conflict. Implement a retry mechanism with exponential backoff if not already in place.Check for Deadlocks:Run the query: SELECT * FROM pg_stat_activity WHERE state = 'active' AND query LIKE '%LOCK%' to find any current locking queries that might be causing serialization failures.Review Recent Long-Running Queries:Execute: SELECT pid, now() - pg_stat_activity.query_start AS duration, query, state FROM pg_stat_activity WHERE (now() - pg_stat_activity.query_start) > interval '5 minutes' ORDER BY duration DESC; This helps identify long-running queries that could be contributing to serialization issues.Examine Locks:Use the query: SELECT relation::regclass, * FROM pg_locks WHERE NOT GRANTED; to identify any locks that are waiting to be granted. This can highlight contention points.Analyze Application Logs: Look for patterns or specific transactions that repeatedly fail with error 40001. This can indicate specific parts of your application logic that might need adjustments to reduce contention.Check Current Transaction Isolation Levels:Verify if the application's transactions are running at an appropriate isolation level. If feasible, consider reducing the isolation level for transactions that do not strictly require SERIALIZABLE isolation. For example, you might switch certain transactions to READ COMMITTED by executing SET TRANSACTION ISOLATION LEVEL READ COMMITTED; in the transaction's session, if this meets your application's consistency requirements.

Taking these actions should help identify and potentially resolve the cause of the serialization failure error 40001 in a Postgres DB.