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Is Union Queries run in Parallel form or not.
Posted by: Azeem Haider
Date: October 17, 2017 11:40PM

I have three tables and I want to select data from these three tables in parallel form to increase the performance.

I'm running query like this.

SELECT * FROM table1
UNION ALL
SELECT * FROM table2
UNION ALL
SELECT * FROM table3

I wan to ask that these queries run in parallel form or in order one by one ?

What can I do to increase the performance of this query. Can I create thread for each query ?

If I create three thread for this query with single connection is it work in parallel or not ? or I need to create three connection for each query to run parallel ?

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Is Union Queries run in Parallel form or not.
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October 17, 2017 11:40PM


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