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Support Article

Realtime Data flow takes long to restart after multiple failures

SA-76285

Summary



When real time data flow run is stopped after a large number of failures, the data flow run takes a long time restart.


Error Messages



Not Applicable


Steps to Reproduce

  1. Create a real time data flow.
  2. Execute the real time data flow such that it creates a large number of data flow failures.
  3. Run for a sufficient time to create a large number of data flow failures.
  4. Stop the data flow.
  5. Restart the data flow.


Root Cause



A defect in Pegasystems’ code or rules.

When a stop and restart is attempted on the realtime dataflow run which has a high number of failed records, the failed entries from <pega data schema>.pr_data_decision_ddf_error table are attempted to be deleted. When the number of records in this table is high, the Delete query with a Where condition is expensive causing a performance bottle
neck.


Resolution



Perform the following local-change:

Truncate the pr_data_decision_ddf_error table using the SQL statement truncate table <pega data schema>.pr_data_decision_ddf_error;.
 

Published March 29, 2019 - Updated December 2, 2021

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