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Support Article

System response is slow and system hangs during check-in



Low performance of the system while responding to activities such as rule save, check-in or check-out, rule delete etc. The system hangs during check-in and branch merge.

Error Messages

Not Applicable

Steps to Reproduce


Root Cause

A defect in Pegasystems’ code or rules. The subquery in 'DELETE FROM PEGA_RULES.pr_sys_appcache_entry...' is incorrectly optimized by the MS and SQL optimizer. This leads to timeouts and low performance of the system.


  1. Apply HFix-42166
  2. Create a Dynamic System Setting (DSS) as below:
    Owning Ruleset: "Pega-RULES"
    value : true

  3. Restart the server after applying the hotfix


Published October 8, 2020

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