update SUBSCRIPTIONTABLE set ACTIVEFLAG='Y' where mobile_num in (select mobile_num from LOADED_MOBILE_NUMBERS)
Change to:
update SUBSCRIPTIONTABLE set ACTIVEFLAG='Y' where exists (select 1 from LOADED_MOBILE_NUMBERS lmn where lmn.mobile_num=SUBSCRIPTIONTABLE.mobile_num);
That should run a lot faster.
Make sure you have indexes on both mobile_num columns.
Chris
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