checkpoint (7) - Linux Man Pages
checkpoint: force a transaction log checkpoint
NAMECHECKPOINT - force a transaction log checkpoint
Write-Ahead Logging (WAL) puts a checkpoint in the transaction log every so often. (To adjust the automatic checkpoint interval, see the run-time configuration options checkpoint_segments and checkpoint_timeout.) The CHECKPOINT command forces an immediate checkpoint when the command is issued, without waiting for a scheduled checkpoint.
A checkpoint is a point in the transaction log sequence at which all data files have been updated to reflect the information in the log. All data files will be flushed to disk. Refer to in the documentation for more information about the WAL system.
The CHECKPOINT command is a PostgreSQL language extension.