build_backup_param
Parameter description: Specifies the minimum specifications for disk backup during incremental build.
Type: SIGHUP
Value range: a string
Default value: (1%, 1G, 1G)
This parameter specifies whether the pg_rewind_bak directory is generated during incremental build. The character string takes effect only when it is configured in the 'x %, yG, zG' format. This parameter is valid only when gs_guc set is set to a valid value. x indicates the percentage of minimum remaining space, y indicates the minimum remaining space, and z indicates the total disk space.
The pg_rewind_bak file is generated and backed up only when both of the following conditions are met:
- Condition 1: The total disk capacity is greater than or equals to z GB. If this condition is not met, the backup is not performed. If this condition is met, the system continues to check condition 2.
- Condition 2: The remaining disk space is greater than or equals to y GB and the percentage of the remaining disk space is greater than or equals to x %.