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https://issues.apache.org/jira/browse/DERBY-6462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13988308#comment-13988308
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Dag H. Wanvik commented on DERBY-6462:
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I think the directory subsubprotocol is the default one; I found I *can* 
specify like this:

ij> connect 'jdbc:derby:directory:mydir/wombat;create=true'; 

instead of just the normal

ij> connect 'jdbc:derby:mydir/wombat;create=true'; 

So there is no difference in semantics here. The database name here 
("mydir/wombat") is a relative path name (in my proposed terminology). It is 
slightly troubling that the database name isn't unique: the name 
"mydir/../mydir/wombat" will denote the same data base. But is it the same data 
base name(?)... It would all have been easier if we said that the database 
identified by a file name (at least when we explicitly or implicitly use the 
directory subsubprotocol).



> Provide more information about database name and path syntax
> ------------------------------------------------------------
>
>                 Key: DERBY-6462
>                 URL: https://issues.apache.org/jira/browse/DERBY-6462
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 10.11.0.0
>            Reporter: Dag H. Wanvik
>            Assignee: Kim Haase
>         Attachments: DERBY-6462-2.diff, DERBY-6462-2.stat, DERBY-6462-2.zip, 
> DERBY-6462-3.diff, DERBY-6462-3.zip, DERBY-6462.diff, DERBY-6462.stat, 
> DERBY-6462.zip
>
>
> Except for initial Windows drive letters (e.g. K:/derby), colons break Derby.
> Windows can't have colons in directory of file names, so this is a Unix issue.
> [http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx#file_and_directory_names]



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