Redrock Postgres Documentation
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IO - ControlFileWriteUpdate

Short Description

Waiting for a write to update the control file.

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. Check that the server I/O subsystem is performing correctly across the cluster.