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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1456) Database connection pooling
Date Mon, 26 Oct 2009 14:15:59 GMT

    [ https://issues.apache.org/jira/browse/JCR-1456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770033#action_12770033
] 

Thomas Mueller commented on JCR-1456:
-------------------------------------

Strange is that Connection.getAutoCommit() is called so much (maybe 50% of all JDBC method
calls). Sometimes it is called 4 times in a row, without any other JDBC calls in between.
It's not a problem for most databases (specially embedded), but I wonder why it is called
so much and if this could be avoided. 

I just tested H2 embedded. I don't know why H2 got slower in your case, maybe because you
set the trace level to the maximum, or because you have used the server mode (I used embedded
and disabled the trace output).

127 seconds with trunk 
131 seconds with JCR-1456
Maven 2.0.9, 1.5.0_20, Mac OS 10.5.8

Unrelated to JCR-1456: I had to disable the H2 shutdown hook because one of tests doesn't
seem to close the repository correctly, so that Jackrabbit executes database statements in
a shutdown hook. This only happens in the trunk, not in JCR-1456.

> Database connection pooling
> ---------------------------
>
>                 Key: JCR-1456
>                 URL: https://issues.apache.org/jira/browse/JCR-1456
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Jukka Zitting
>             Fix For: 2.0.0
>
>         Attachments: 777490.patch, dbcp.patch, dbcp.patch, JCR-1456-performance-trunk-test-setup.patch,
JCR-1456-performance.txt, JCR-1456.patch, patch-1456-1.txt, patch-1456-2.txt, patch-1456-3.txt
>
>
> Jackrabbit should use database connection pools instead of a single connection per persistence
manager, cluster journal, or database data store.

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