Archiving

archive_mode

Parameter description: Specifies whether to archive WALs.

This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.

NOTICE: When wal_level is set to minimal, the archive_mode parameter is unavailable.

Value range: Boolean

  • on indicates that the archiving is enabled.
  • off indicates that the archiving is disabled.

Default value: off

archive_command

Parameter description: Specifies the command set by the administrator to archive WALs. You are advised to set the archive log path to an absolute path.

This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.

NOTICE:

  • Any %p in the string is replaced by the absolute path of the file to archive, and any %f is replaced by only the file name. (The relative path is relative to the data directory.) Use %% to embed an actual % character in the command.
  • This command returns zero only if it succeeds. The following shows the command:
archive_command = 'cp --remove-destination %p /mnt/server/archivedir/%f' 
  • --remove-destination indicates that files will be overwritten during the archiving.

Value range: a string

Default value: (disabled)

archive_timeout

Parameter description: Specifies the archiving period.

This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.

NOTICE:

  • The server is forced to switch to a new WAL segment file when the period specified by this parameter has elapsed since the last file switch.
  • Archived files that are closed early due to a forced switch are still of the same length as full files. Therefore, a very short archive_timeout will bloat the archive storage. You are advised to set archive_timeout to 60s.

Value range: an integer ranging from 0 to INT_MAX. The unit is second. 0 indicates that archiving timeout is disabled.

Default value: 0

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    openGauss 2024-05-30 00:44:48
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