darkz1984 commented on PR #12826:
URL: 
https://github.com/apache/dolphinscheduler/pull/12826#issuecomment-1336049996

   > Every workflow instance has a distinct id, you will rerun the workflow 
instance in every 5 minutes?
   > 
   > In general, the index `process_instance_id` is enough.
   
   But delete process instance will delete the task instance casde, and the 
task instance may be with a huge number of rows in it. In my system, it reach 
10,000 of rows one day, and total reach 4,000,000 rows. So it need to add this 
index to speed up delete the task instance with this index


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