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Support Article

System Cleaner database contention issue

SA-25890

Summary



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:
 delete                                                                     
 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

DSNT408I SQLCODE = -913, ERROR:  UNSUCCESSFUL EXECUTION CAUSED BY DEADLOCK OR TIMEOUT.


Steps to Reproduce



Not applicable.


Root Cause



A defect in Pegasystems’ code or rules.

Resolution



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

 

Suggest Edit

Published July 28, 2016 - Updated October 8, 2020

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