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https://issues.apache.org/jira/browse/DERBY-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640144#action_12640144
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Knut Anders Hatlen commented on DERBY-3847:
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For a system-wide, dynamic property set in derby.properties, I don't
think it is correct that it persists until the value is changed or the
file is removed. At least, that's not what I observed when I tried to
change derby.locks.waitTimeout (which is system-wide and dynamic
according to the documentation). So I think you need to add "and the
system is rebooted", like you did for the static properties.
See also http://db.apache.org/derby/docs/dev/tuning/ctunsetprop44147.html:
> Note: Properties set in the derby.properties file and on the command
> line of the application that boots Derby are always static, because
> Derby reads this file and those parameters only at startup.
> 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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