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https://issues.apache.org/jira/browse/DERBY-4259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kim Haase reopened DERBY-4259:
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Thanks for catching this, Dag. 

I notice that in the Developer's Guide we talk about a "full upgrade" rather 
than a "hard upgrade" (though the opposite is still "soft"). 

I should probably refer to the "upgrade=true attribute" topic, which then 
refers to the appropriate section of the Dev Guide.

So a soft upgrade does not change the DataDictionaryVersion, unlike a full 
upgrade?

I'll file another suggested patch.
                
> Document database property for determining database format version
> ------------------------------------------------------------------
>
>                 Key: DERBY-4259
>                 URL: https://issues.apache.org/jira/browse/DERBY-4259
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.6.1.0
>            Reporter: Kathey Marsden
>            Assignee: Kim Haase
>            Priority: Minor
>             Fix For: 10.10.0.0
>
>         Attachments: DERBY-4259-2.diff, DERBY-4259-2.zip, DERBY-4259-3.diff, 
> DERBY-4259-3.zip, DERBY-4259.diff, DERBY-4259.stat, DERBY-4259.zip
>
>
> It would be useful  to have a public interface for determining the database 
> format when running in soft upgrade mode.  In the derby-user thread:
> http://www.nabble.com/Hard-upgrade-failing--td23826558.html#a23835534
> Evan pointed out he was using an undocumented property 
> 'DataDictionaryVersion' for this purpose, but this is not ideal because it 
> does not conform to the normal derby.* naming convention  and is not 
> documented.
> Discussion in DERBY-4255 determined that there are not currently 
> DatabaseMetaData methods that achieve the same result.

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