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From Sébastien Launay (JIRA) <j...@apache.org>
Subject [jira] Commented: (JCR-1435) Choose the MySQL engine for database storage (default to MyISAM)
Date Fri, 07 Aug 2009 12:38:15 GMT

    [ https://issues.apache.org/jira/browse/JCR-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740528#action_12740528
] 

Sébastien Launay commented on JCR-1435:
---------------------------------------

This will work but you need to duplicate the mysql.ddl and therefore maintain it on your own,
even if there is a small chance it will change over time because it will imply a migration
process.

Another thing is that the default table engine is often MyISAM and this engine is not supported
in a cluster config.
Indeed, there will be no RDBMS locking involved when accessing the journal table and data
integrity will not be enforced.

> Choose the MySQL engine for database storage (default to MyISAM)
> ----------------------------------------------------------------
>
>                 Key: JCR-1435
>                 URL: https://issues.apache.org/jira/browse/JCR-1435
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>    Affects Versions: core 1.4.1
>         Environment: MySQL with NDB Cluster engine
>            Reporter: Sébastien Launay
>         Attachments: jackrabbit-1.4.x-mysql-engine-2008-04-28.patch, jackrabbit-1.4.x-mysql-engine.patch,
jackrabbit-trunk-mysql-engine-2008-04-28.patch, jackrabbit-trunk-mysql-engine.patch
>
>
> The MySQL scripts embedded into Jackrabbit does not specify the engine to use.
> So by default MyISAM is used and we cannot change this.
> But, depending on the environment we may want to use an alternate engine like
> InnoDB (for transaction support) or in my case NDB Cluster (for high availability).
> We can still manually created the tables and then set the wanted engine, but it would
> be better if there was a parameter for the engine for component in the repository.xml
> for automatic table creation.

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