File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Object Relational Mapping and the fly likes Hibernate performance.. Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Databases » Object Relational Mapping
Bookmark "Hibernate performance.." Watch "Hibernate performance.." New topic

Hibernate performance..

Alejandro Ross

Joined: Jun 13, 2006
Posts: 9
Hi everyone.. I have a huge ORDERS table to work with and each customer has a set of ORDERS within the orders table. There are over 2 million records in the ORDERS table. I tried to run the following in Hibernate (Java) but got a java.lang.OutOfMemoryError: Java heap space error. HELP!!
What is the best move I can make to fix this problem?

"select sum(orderz.result03),sum(orderz.result05),sum(orderz.result07),sum(orderz.result08),sum(orderz.result09),sum(orderz.result26)," +
// "sum(orderz.result02),sum(orderz.result04),sum(orderz.result06),sum(orderz.result13),sum(orderz.result16),sum(orderz.result18)," +
// "sum(orderz.result19),sum(orderz.result25)," +
// "sum(orderz.result15),sum(orderz.result17),sum(orderz.result00),sum(orderz.result01)" +
//" from DialingListEntry as orderz where orderz.CUSTOMER_ID = :custId")
// .setInteger("custId", custId);

Anyone have any suggestions??? Help is much appreciated... In either DB work or hibernate.. Thanks
Mark Spritzler

Joined: Feb 05, 2001
Posts: 17276

Where is all the code, and why are all the lines commented out except the first line?

Why not just create a SQLQuery object and run that instead of with Query object. This way it won't fill up your 1st level cache. Or set the CacheMode to None, and it won't cache the objects created for the query.


Perfect World Programming, LLC - iOS Apps
How to Ask Questions the Smart Way FAQ
I agree. Here's the link:
subject: Hibernate performance..
jQuery in Action, 3rd edition