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Short Description

Waiting to fill a dynamic shared memory backing file with zeroes.

Additional Information​

DSMFillZeroWrite is seen during the creation of Dynamic Shared Memory (DSM) segments. These segments are backed with a file on disk and this call covers the initialization when the memory and file are zero’d out.

How to reduce this wait​

If there is significant wait on this event:

  • Check excessive for server I/O load
  • Check for server disk related errors

PostgreSQL documentation - The Statistics Collector

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