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Re: [eclipselink-users] Batch insert
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You should also not use IDENTITY sequencing, instead use TABLE sequencing,
then you can make use of sequence preallocation, and batch writing.
tch wrote:
>
> Check out the wiki on batch writing:
> http://wiki.eclipse.org/Optimizing_the_EclipseLink_Application_(ELUG)#How_to_Use_Batch_Writing_for_Optimization
>
> ./tch
>
>
>
> On Wed, Jun 3, 2009 at 6:23 AM, Leen Toelen <toelen@xxxxxxxxx> wrote:
>> Hi,
>> what is the recommended way to batch insert an object tree using
>> eclipselink? I have a three-level object tree, where each parent has a
>> one
>> tot many relationship with its children.
>> A
>> - B
>> - C
>> - C
>> - C
>> - C
>> - C
>> - B
>> - C
>> - C
>> - C
>> -B
>> - C
>> When I use em.persist(a) with logging set to FINEST, I notice that each
>> object generates a separate insert statement, and a "select @@IDENTITY"
>> after the insert. The persist is transactional, so all inserts are
>> committed
>> at the same time, but is there a way to only create a single insert
>> statement fot the C objects with multiple parameters like this
>> insert into C(col1,col2,B_ID)
>> values
>> (...,...,...)
>> (...,...,...)
>> (...,...,...)
>> (...,...,...)
>> (...,...,...)
>> and execute this in one go?
>> I tried eclipselink.jdbc.batch-writing "JDBC", but this only batches a
>> single insert of C, which does not solve the problem.
>> Does anyone has an idea to improve batch insertion time?
>> Regards,
>> Leen Toelen
>
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
EclipseLink , http://www.oracle.com/technology/products/ias/toplink/
TopLink
Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink ,
http://wiki.oracle.com/page/TopLink TopLink
Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
http://www.nabble.com/EclipseLink-f26430.html EclipseLink
Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
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