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P
40p01
Moderate
PostgreSQL · Database Server
PostgreSQL SQLSTATE 40P01 (deadlock_detected) indicates deadlock detected during transaction lifecycle and lock behavior.
Quick Answer
Error code 40P01 on your PostgreSQL Database Server means: PostgreSQL SQLSTATE 40P01 (deadlock_detected) indicates deadlock detected during transaction lifecycle and lock behavior.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
RDS-POSTGRESAZURE-PG-FLEXCLOUDSQL-PG1112131415161718
Likely Causes
  1. The current statement triggered deadlock_detected, which PostgreSQL classifies as SQLSTATE 40P01.
  2. Application SQL, parameter values, or transaction state are incompatible with PostgreSQL rules for deadlock detected.
  3. Environment differences (schema, permissions, or runtime settings) exposed this 40P01 condition in production flow.
How to Fix It
1
Capture full query text, bind values, and transaction context for SQLSTATE 40P01.
2
Reproduce deadlock_detected in staging with the same schema version and connection settings.
3
Inspect pg logs and execution plan details to isolate the exact failing clause or object.
4
Apply a targeted fix (query rewrite, schema migration, or transaction-order change) for deadlock detected.
5
Deploy and verify SQLSTATE 40P01 no longer appears in error telemetry.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
0800008003080060800108004
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