Slow Performance of purge_instances_oracle.sql when Purging BPEL Dehydration Store (Doc ID 555970.1)

Last updated on AUGUST 14, 2018

Applies to:

Symptoms

The purge_instances_oracle.sql procedure executes for an unreasonably long time as reported in <Bug 6806290> and <Bug 6727429>. (Even with the optimization in <Bug 6501312> applied.)

A SQL trace of the purge might appear to be stuck on the following DELETE but an analysis of the trace file should reveal that the script is in a slow CURSOR FOR-LOOP:

DELETE FROM document_dlv_msg_ref
   WHERE message_guid = r_invoke_message.message_guid;  

 Or the purge might appear to be stuck on the following DELETE which is its own bottleneck:

DELETE FROM xml_document
   WHERE dockey NOT IN
      (SELECT dlv_ref.dockey FROM document_dlv_msg_ref dlv_ref
      UNION
      SELECT doc_ref.dockey FROM document_ci_ref doc_ref );

Cause

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