ControlFileSync
Short Description
Waiting for the pg_control file to reach durable storage.
Detailed Description
The control file pg_control is an 8kb binary file which stores information about various aspects of the PostgreSQL server's internal state, such as the most recent checkpoint, as well as fundamental parameters set by initdb. It is located in the cluster's global/ directory.
How to reduce this wait
Updating the control file is fundamental to the normal operation of the database.
Ensure the server I/O subsystem is performing correctly across the cluster.
Additional Links
PostgreSQL Docs - Wait Events of Type IO
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