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Support Article

System Cleaner database contention issue



The System Cleaner agent has been enabled on all the nodes which is causing database contention because of which the DB records are getting deleted properly but showing errors on database logs. User requires is know if it is okay to enable System Cleaner agent on one node per database, will the issue get solved? For example, one phase of SystemCleaner activity calls this query.

Following is the details:
 from     schema-name.pr4_log_rule_usage_details                                    
 where    pxObjClass = 'Log-RuleUsage-Details'                              
   and    pxSystemNode = ?                                                  
   and    pyLabel = ?                                                       

If two nodes execute this query, one will succeed and the other will fail with error below.

Error Messages


Steps to Reproduce

Not applicable.

Root Cause

A defect in Pegasystems’ code or rules.


Apply HFix-28369 which ensures only one node is running SystemCleaner at any given time. 


Published July 28, 2016 - Updated October 8, 2020

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