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Data Miner’s Framework for Polling to Obtain Workflow Status Is Very Slow (Doc ID 2052248.1)

Last updated on AUGUST 23, 2022

Applies to:

Oracle Data Mining - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and environment data used represents fictitious data from the Oracle sample or bulit-in schema(s), Public Documentation delivered with an Oracle database product or other training material.  Any similarity to actual environments, actual persons, living or dead, is purely coincidental and not intended in any manner.

This query that all ODM connections run multiple times every minute, run for 5-20 seconds:

SELECT jobs.WORKFLOW_CHAIN_NAME, jobs.WORKFLOW_NAME, jobs.WORKFLOW_ID
     , jobs.WORKFLOW_STATUS, jobs.PROJECT_NAME, jobs.PROJECT_ID
     , jobs.WORKFLOW_JOB_NAME, steps.NODE_ID, steps.NODE_STATUS
     , steps.NODE_START_TIME, steps.NODE_RUN_TIME, steps.subnode_id
     , steps.subnode_status, (steps.NODE_START_TIME + steps.NODE_RUN_TIME) finish_job_time, jobs.JOB_CREATION_TIME
     , CURRENT_TIMESTAMP
  FROM odmr_user_workflow_jobs jobs, odmr_user_workflow_all steps
 WHERE jobs.workflow_job_name IN (SELECT workflow_job_name
                                    FROM (SELECT t.*
                                                 , ROW_NUMBER () OVER (PARTITION BY workflow_id ORDER BY job_creation_time DESC, workflow_chain_name DESC) rid
                                            FROM odmr_user_workflow_jobs t)
                                   WHERE rid = 1)
   AND steps.wf_job_name = jobs.workflow_job_name
   AND ( ( (jobs.JOB_CREATION_TIME > (CURRENT_TIMESTAMP - INTERVAL '24' HOUR))
       OR (WORKFLOW_STATUS IN ('ACTIVE', 'QUEUED', 'STOPPING')))
     OR ( (steps.NODE_START_TIME + steps.NODE_RUN_TIME) > (CURRENT_TIMESTAMP - INTERVAL '1' MINUTE)))
ORDER BY node_start_time DESC;

So if we have 5 users connected, database load will be 5 active sessions. This query is always running and running very slow.


Changes

 Upgraded to 12C from 11G

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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