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monkiki
 Post subject: HQL filter elements() bad performance
PostPosted: Wed Sep 19, 2012 3:21 am 
Newbie

Joined: Sat Feb 12, 2011 3:49 pm
Posts: 13
Hi there,

I have a HQL something like this:

Code:
from MyDocument md where :keyword in elements(md.keywords)


It give me the required results, but the performance is slow when there are thousand of MyDocument entries. Even when none of them has any keywords!

Can I rewrite the query to speed up it? The only way I have archived good performance is with native SQL, but I try to avoid it if possible.

Thanks in advance.
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pb00067
 Post subject: Re: HQL filter elements() bad performance
PostPosted: Mon Sep 24, 2012 10:07 am 
Expert
Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990
Quote:
Can I rewrite the query to speed up it?


The book "Java Persistence with Hibernate" (see above at the top of the page) writes following:
Quote:
... you should question frequent use of subqueries because queries with subqueries can often be rewritten using only joins and aggregation.
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monkiki
 Post subject: Re: HQL filter elements() bad performance
PostPosted: Mon Sep 24, 2012 11:18 am 
Newbie

Joined: Sat Feb 12, 2011 3:49 pm
Posts: 13
Ok, I see this phrase in page 662, I will take a look into the chapter.
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