Error code
PostgreSQL 40P01
POSTGRESQL40P01
Database Error Code· An error code returned by a database server such as PostgreSQL or MySQL.
What it means
deadlock_detected — two transactions are waiting on each other.
How to fix it
- Retry the rolled-back transaction after a short random delay.
- Ensure all transactions acquire locks on tables or rows in the same consistent order.
- Shorten transaction scope to hold locks for the minimum time necessary.
Not affiliated with PostgreSQL. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More PostgreSQL codes
- 08001sqlclient_unable_to_establish_sqlconnection — initial connection refused
- 08006connection_failure — the connection to the server broke
- 0A000feature_not_supported — the requested feature is not implemented
- 22001string_data_right_truncation — a value is too long for the column
- 22003numeric_value_out_of_range — a number exceeds the column's storage range
- 22P02invalid_text_representation — a string could not be parsed into the target type
- 23502not_null_violation — a required column received no value
- 23503foreign_key_violation — the referenced row does not exist
- 23505unique_violation — a row with this key already exists
- 23514check_violation — a row failed a table check constraint
- 25P02in_failed_sql_transaction — the current transaction has already failed
- 28000invalid_authorization_specification — the role is not permitted to connect