Oracle Error ORA-00053: maximum number of enqueues exceeded

Oracle Error Message

ORA-00053: maximum number of enqueues exceeded

Reason for the Error

An operation requested a resource that was not available, and the resource’s enqueue list had reached its maximum length.

If a request is made for an unavailable resource, the request is enqueued to wait for the resource.

The initialization parameter ENQUEUE RESOURCES specifies the maximum number of requests that can be queued for a given resource.

When the maximum number of requests is reached, no more requests can be added to the enqueue list.

Solution

In a few minutes, try the operation again.

If you receive this message frequently, restart Oracle, increase the ENQUEUE RESOURCES parameter in the initialization parameter file, and restart Oracle.