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Date: Fri, 7 Aug 2009 05:46:14 -0700 (PDT)
From: "Stefan Guggisberg (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
Subject: [jira] Commented: (JCR-1435) Choose the MySQL engine for database
 storage (default to MyISAM)
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    [ https://issues.apache.org/jira/browse/JCR-1435?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D127405=
29#action_12740529 ]=20

Stefan Guggisberg commented on JCR-1435:
----------------------------------------

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

OTOH, IIUC with the proposed patch it's not possible anymore to implicitly =
use the default engine, e.g. overriden in my.cnf.

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

in which case you'd have to specify a different engine in my.cnf.

> 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: S=C3=A9bastien Launay
>         Attachments: jackrabbit-1.4.x-mysql-engine-2008-04-28.patch, jack=
rabbit-1.4.x-mysql-engine.patch, jackrabbit-trunk-mysql-engine-2008-04-28.p=
atch, 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 avai=
lability).
> 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 re=
pository.xml
> for automatic table creation.

--=20
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