SQLSTATE 40000 signals that PostgreSQL aborted the current transaction and rolled back all pending changes.
PostgreSQL Error 40000 transaction_rollback occurs when the server aborts a transaction due to a prior failure, serialization conflict, deadlock, or explicit ROLLBACK. Restart or fix the failing statement, then run a fresh transaction to resolve the issue.
PostgreSQL Error 40000
PostgreSQL raises SQLSTATE 40000 when it must roll back the entire transaction block because one statement failed or the session detected a conflict. Any subsequent command in that block returns this error instead of running.
The error protects data integrity. Once the engine marks a transaction as failed, every remaining statement is rejected so that partial changes cannot be committed.
Fixes require starting a new clean transaction.
Single-statement failure inside BEGIN … COMMIT instantly invalidates the surrounding transaction. Later statements see SQLSTATE 40000.
Server-detected conflicts such as serialization failure or deadlock force a rollback and surface as transaction_rollback.
Abort the invalid transaction with ROLLBACK or simply close the session.
Investigate the root cause of the first failure, correct it, and rerun the work in a new transaction block.
Use retry logic for transient problems like serialization failure.
Wrap the transaction in a loop that retries after a short, randomized back-off.
Deadlock between two sessions – identify locks with pg_locks, terminate one session, and retry.
Unique key violation – correct the offending data or use ON CONFLICT DO NOTHING/UPDATE.
Validate inputs before executing DML to minimize run-time exceptions.
Design transactions to be short and touch rows deterministically so they rarely deadlock or serialize.
SQLSTATE 40001 serialization_failure – similar rollback but specific to serializable isolation conflicts.
SQLSTATE 40P01 deadlock_detected – rollback due to deadlock; resolve locking order.
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No. PostgreSQL will reject every command until you issue ROLLBACK or disconnect. Always end the failed block first.
Autocommit limits the scope to one statement, so a failure rolls back only that statement. Long explicit transactions can still hit 40000.
Galaxy’s context-aware linting warns about potential constraint violations and deadlocks before you run the query, reducing chances of runtime failure.
Shorter lock timeouts can surface conflicts earlier but do not remove deadlock risk. Design transactions to lock rows in consistent order.
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