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Support Article

RULEUSAGESNAPSHOT query takes more than 20 seconds

SA-40803

Summary



Pega RuleUsageSnapshot query takes more than 20 seconds.


Error Messages



Database operation took more than the threshold of 300 ms: 20,602 ms SQL: delete from DATA.pr4_log_rule_usage_details where pxObjClass = 'Log-RuleUsage-Details' and pxSystemNode = ? and pyLabel = ?


Steps to Reproduce



Not Applicable


Root Cause



A defect or configuration issue in the operating environment. Explain plan for the delete statement shows it is using table scan and that's why the query takes upwards of 20 seconds.
The cardinality of the three columns in where condition is very low and thus an index won't help too much.

For pxObjClass & pyLabel, only one distinct value; For pxSystemNode, 8 distinct values.


Resolution


Since the query is executed only once daily and that too during off hours at 1am, the execution time is acceptable and doesn't cause any lasting performance impact on the application. When appropriate, create the necessary index if that avoids a table scan.
Suggest Edit

Published August 26, 2017 - Updated October 8, 2020

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