ORA-12751: cpu time or run time policy violation


Q:
What is the error "ORA-12751: cpu time or run time policy violation" means?

A:
This is an undocumented error.
Cause: A piece of code ran longer than it is supposed to
Action: If this error persists, contact Oracle Support Services.

This error happens most commonly  with MMON process while taking AWR snapshots. If the process holds resources more than 15 minutes, the MMON process will be terminated and the snapshot will not be taken. You will see a snapshot is missing in the repository in this case.

The MOS note 761298.1   regarding this error will be helpful 
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