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Short Description

Waiting for a WAL file to reach durable storage.

Additional Information

The Write-Ahead Logging (WAL) is PostgreSQL standard method for ensuring data integrity. WALSync can be seen when log writes are waiting to be acknowledged on ‘durable storage’ aka - disk.

How to reduce this wait

Ensure the IO subsystem is available and not overloaded.

PostgreSQL - Waits of Type IO

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