[Alarm]DisableFilterOptimization

By default, Plant SCADA uses filter optimization for queries of historic alarm data. This turns the filter criteria for configured alarm fields into sets of alarm object IDs before applying them to the final queries.

This is effective when the number of object IDs required by a query is less than a threshold affected by the size of the project, the match rate of the filter and the density of the historic data kept on site. In general, the improvement is more prominent when filtering for a smaller subset of historic data. Its effectiveness drops as the filter becomes more inclusive. In unusual circumstances, the threshold may be crossed which can impact system performance.

This parameter allows you to turn off filter optimization to determine if it is having an impact on system performance.

Note: This parameter can also be applied to a specific cluster or alarm server process. For more information, see Configure Alarm Parameters for a Specific Cluster or Process.

Allowable Values:

• 0 - (Enable)

• 1 - (Disable)

Default Value:

0

See Also

Alarm Parameters