System Performance Snapshot
enable_wdr_snapshot
Parameter description: Specifies whether to enable the database monitoring snapshot function.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that the database monitoring snapshot function is enabled.
- off indicates that the database monitoring snapshot function is disabled.
Default value: off
wdr_snapshot_retention_days
Parameter description: Specifies the number of days for storing database monitoring snapshot data in the system. When the number of snapshots generated during database running exceeds the maximum number of snapshots that can be generated within the retention period, the system clears the snapshot data with the smallest snapshot_id at the interval specified by wdr_snapshot_interval.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 1 to 8
Default value: 8
wdr_snapshot_query_timeout
Parameter description: Specifies the execution timeout for the SQL statements associated with database monitoring snapshot operations. If the SQL statement execution is not complete and a result is not returned within the specified time, the snapshot operation fails.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 100 to INT_MAX. The unit is s.
Default value: 100s
wdr_snapshot_interval
Parameter description: Specifies the interval at which the backend thread Snapshot automatically performs snapshot operations on the database monitoring data.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 10 to 60. The unit is min.
Default value: 1h