Hi Andy!
Thanks a lot for your hints!
Indeed the problem was on my side. Some Hibernate tuning solved the
problem (and I was able to speedup the query using IN). The real
problem was that Hibernate using unprepared queries if you create a
native query, but prepares the query if you use JP-QL (very odd
behavior). Thanks anyway for your help!
Kind regards
Thilo
> I am going to guess the slow part is sending 1M different queries back and forth from client to server. You could
trybatching them together:
>
> DELETE FROM table1 WHERE table2_id in (11242939, 1,2,3,4,5...., 42);
>
> Also are you preparing the query?
>
> -Andy
>
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