PostgreSQL 55P03: lock_not_available57000 operator_intervention 报错 故障修复 远程处理

文档解释

55P03: lock_not_available57000 operator_intervention

Error Code 57P03: Lock Not Available

Error code 57P03 is a somewhat rare PostgreSQL error code that is associated with a deadlock between two processes. It occurs when two or more processes are attempting to access the same resource, such as a table, and one process is unsuccessful in their attempt.

Error Message

The error message for the 57P03 lock not available PostgreSQL error code is:

“ERROR: 57P03: lock not available”

Common Cases

This type of error is most commonly seen when one process is trying to acquire a write lock on a resource while another process is trying to acquire a read lock on the same resource. In order to prevent both processes from having to wait until the other one is finished, PostgreSQL will throw an error and kill one of the processes.

Another common cause of the 57P03 error is when one process is trying to acquire a write lock on a resource but another process already has a write lock on the same resource. When PostgreSQL encounters this situation, it will kill one of the processes in order to prevent a deadlock.

In some cases, the 57P03 error can also be caused by a transaction that has been running for too long. This can happen when a transaction fails to commit within the timeout period, and PostgreSQL will kill the process in order to prevent data corruption.

Solution

The simplest way to fix the 57P03 error is to restart the database. This will reset all locks and give the process a chance to successfully acquire the lock it needs.

If the error continues to occur, it’s possible that the database structure may need to be reworked to avoid this deadlock situation. This may include modifying indexes, altering data types, or restructuring tables.

Alternatively, the timeout period of long-running transactions can be increased to avoid the 57P03 error. This can be done by setting the “statement_timeout” parameter in the PostgreSQL configuration file, which will add additional time for a transaction to complete.

Additionally, if the 57P03 error occurs frequently, it may be worth implementing an optimistic concurrency control system. This type of system uses “version numbers” to ensure that any changes made to a resource occur in the correct order, which can help to reduce the occurrence of deadlocks.