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ORA-12801: error signaled in parallel query server P004

I'm getting "ORA-12801: error signaled in parallel query server P004." What do I do?

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Unfortunately, the ORA-12801 error message is not enough to figure out what the problem is. What SQL was being issued that caused this error? What other error messages are given? As you can see from the description of this error code, the messages that follow lead to the root cause, not this error message.
myhost% oerr ora 12801
12801, 00000, "error signaled in parallel query server %s"
// *Cause: A parallel query server reached an exception condition.
// *Action: Check the following error message for the cause, and consult
//          your error manual for the appropriate action.
// *Comment: This error can be turned off with event 10397, in which
//           case the server's actual error is signaled instead.

This was first published in March 2007

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