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https://issues.apache.org/jira/browse/DERBY-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636711#action_12636711
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Kim Haase commented on DERBY-3847:
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Thanks, Dag, that helps a lot. I have incorporated your suggestions. 

About 

* "be sure to trim extra spaces around the word true" 

Is anything except the exact string "true" treated as meaning "false"? In that 
case, extra spaces around "false" would not be a problem -- "  false  " would 
mean the same thing as "false", though not for the reason the user thinks.

I don't know of any property other than derby.database.sqlAuthorization that 
can't be disabled once enabled, so I will document that as the only one unless 
I hear otherwise.


> 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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