Checkpoints
checkpoint_segments
Parameter description: Specifies the minimum number of WAL segment files in the period specified by checkpoint_timeout. The size of each log file is 16 MB.
Type: SIGHUP
Value range: an integer. The minimum value is 1.
Default value: 64
Increasing the value of this parameter speeds up the export of big data. Set this parameter based on checkpoint_timeout and shared_buffers. This parameter affects the number of WAL log segment files that can be reused. Generally, the maximum number of reused files in the pg_xlog folder is twice the number of checkpoint segments. The reused files are not deleted and are renamed to the WAL log segment files which will be later used.
checkpoint_timeout
Parameter description: Specifies the maximum time between automatic WAL checkpoints.
Type: SIGHUP
Value range: an integer ranging from 30 to 3600 (s)
Default value: 15min
If the value of checkpoint_segments is increased, you need to increase the value of this parameter. The increase of them further requires the increase of shared_buffers. Consider all these parameters during setting.
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