[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4042) StatelessSession does not flush when using jdbc batch_size > 1

[radhakrishna (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38845#action_38845 ] 

radhakrishna commented on HHH-4042:
-----------------------------------

If we are committing 100 records in one commit using the same statelessSession/session, shouldn't it be intelligent enough to automatically commit 100 records in jdbc batch, why even specify the batch_size somewhere in the configuration, may be they should expose it as a runtime rather than a global constant.

Committing 1000 records using statelessSession with a batch size of 500, will commit 500 in a batch and 500 again rather than 500 separate inserts?

> StatelessSession does not flush when using jdbc batch_size > 1
> --------------------------------------------------------------
>
>                 Key: HHH-4042
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4042
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.3.1
>         Environment: JBoss 4.2.3, Linux, java 1.6, hibernate 3.3.1, entityManager 3.4.0, jboss seam 2.1.2, postgresql 8.3
>            Reporter: Gael Beaudoin
>
> I'm using a StetelessSession to insert millions of rows : it works great and without using much memory. But I've just seen that with a jdbc batch size of 50 for example (<property name="hibernate.jdbc.batch_size" value="0"/> in my persistence.xml) the last round of inserts aren't flushed to the database. For example, with 70 insert, only the first 50 are sent to the database.
> I've searched a lot about this issues and on this thread (https://forum.hibernate.org/viewtopic.php?f=1&t=987882&start=0), the only solution found is to set the batch_size to 1, which is really a shame.
> I've tried to flush the session, close the jdbc connection, etc etc ... no luck.
> I'd be fine with a way to set the batch_size to 1 only for this method, pro grammatically, but I've not found any way to do that.
> If you don't pay attention, it's a easy way to lose data.

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