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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2715) Improved join query performance
Date Tue, 30 Nov 2010 10:12:13 GMT

     [ https://issues.apache.org/jira/browse/JCR-2715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting updated JCR-2715:
-------------------------------

    Attachment: ThreeWayJoinTest.png
                TwoWayJoinTest.png

See the attached graphs for the achieved performance improvements. That's two orders of magnitude
(from 1341ms to 10ms) for a two-way join, and almost as much (from 1851ms to 90ms) for a three-way
join.

> Improved join query performance
> -------------------------------
>
>                 Key: JCR-2715
>                 URL: https://issues.apache.org/jira/browse/JCR-2715
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, query
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 2.2.0
>
>         Attachments: ThreeWayJoinTest.png, TwoWayJoinTest.png
>
>
> Our current implementation of SQL2 join queries does not perform very well on pretty
much any non-trivial data set.

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