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https://issues.apache.org/jira/browse/DERBY-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637558#action_12637558
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Kim Haase commented on DERBY-3847:
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Thanks again, Dag. I am tempted to try to make this right, but you may be right
that things are just too baroque -- too many possibilities. Would it be correct
to modify the last part of
http://db.apache.org/derby/docs/dev/tuning/ctunsetprop824500.html to say:
A system-wide property might have persistence, depending on how you set it and
whether it is dynamic or static. If you set it programmatically, it persists
only for the duration of the JVM of the application that set it. If you set it
in the derby.properties file, a dynamic property persists until:
* That value is changed
* The file is removed from the system
* The database is booted outside of that system
A static property set in the derby.properties file persists until:
* That value is changed and the system is rebooted
* The file is removed from the system and the system is rebooted
* The database is booted outside of that system
> 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-3847-2.zip, DERBY-3847-3.diff, DERBY-3847-4.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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