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Looking for some help to run below delete in another way as below is long running.

delete from dbo.customer 
where ac_no not in (select ac_no from dbo.account)
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  • Maybe it's waiting for a lock? Commented Jun 5, 2020 at 6:08
  • A delete trigger may also be the problem. For big update statements you may want to temporarily disable for-row triggers. Commented Jun 5, 2020 at 7:23

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Perhaps PostgreSQL can optimize a NOT EXISTS clause better:

DELETE FROM dbo.customer
WHERE NOT EXISTS (SELECT 1 FROM dbo.account
                  WHERE customer.ac_no = account.ac_no);

But without seeing EXPLAIN output it is hard to say.

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