PMON—the Process Monitor

The Process Monitor is responsible for performing the following operations:

  • Process recovery when a user process fails, including cache cleanup and the freeing of resources the process was using

  • Rollback of uncommitted transactions

  • Release of locks held by failed or terminated processes

  • Restart of failed dispatcher and shared server processes

The PMON process wakes up on a regular basis to check whether any of these operations are required. In addition, other background processes can wake up PMON if they require one of these services.

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