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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3847) Tuning Guide lacks information on turning off Derby property settings
Date Thu, 02 Oct 2008 22:27:47 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636489#action_12636489
] 

Dag H. Wanvik commented on DERBY-3847:
--------------------------------------

> Do the conglomerate properties fall into this category..?

It seems these can all be changed, but change will not impact existing
conglomerates, only tables or indexes created after the change.


> Tuning Guide lacks information on turning off Derby property settings
> ---------------------------------------------------------------------
>
>                 Key: DERBY-3847
>                 URL: https://issues.apache.org/jira/browse/DERBY-3847
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 10.4.1.3
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: ctunproper22250.html, ctunproper22250.html, DERBY-3847-2.diff, DERBY-3847-3.diff,
DERBY-3847.diff, DERBY-3847.stat, DERBY-3847.zip
>
>
> The documentation of how to turn off Derby properties is spotty. Dag Wanvik reports that
"I checked the code, and when you set a database property to a null value, that property is
removed from the list of database properties; i.e. the situation is back to where you were
before it was first set, so the built-in defaults apply again (or system properties if there
are any)."
> The behavior for turning off user settings is slightly different and is documented in
several places; it's the general case that seems to be missing. This information needs to
be added to the description of Derby properties in the Tuning Guide, probably in the general
topic "Derby properties" (http://db.apache.org/derby/docs/dev/tuning/ctunproper22250.html).

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