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Put all these subjobs in Design Area.
Don't use any "OnsubjobOK", "OnsubjobError", "OnComponentOK", "OnComponentError" here.
Check tag "Job"->"Extra"->"Multi thread execution".
But if this job handles big data, I'm afraid the performance is still poor.
I have a requirement where i have to get data from 50+ tables in my database. If I execute one by one by it will take long time to complete.
Can you suggest how i can run all the 50 queries seperately to extract the data.