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From "Suresh Thalamati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1838) Derby allows dual boot which can cause corruption of databases with JVM's lower than 1.4.2 on non-windows systems
Date Tue, 12 Sep 2006 06:11:23 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1838?page=comments#action_12434071 ] 
            
Suresh Thalamati commented on DERBY-1838:
-----------------------------------------

Kathy, 

I think this is issue not a bug ,  this is a known problem documented in the developer guide.
http://db.apache.org/derby/docs/dev/devguide/cdevdvlp20458.html.

I agree,  it would be great  if some can fix this issue, but I would consider that as improvement.






> Derby allows dual boot which  can cause corruption of databases with JVM's lower than
1.4.2 on non-windows systems
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1838
>                 URL: http://issues.apache.org/jira/browse/DERBY-1838
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.0.2.2, 10.1.1.0, 10.2.1.0, 10.1.2.1, 10.1.3.0,
10.3.0.0, 10.1.4.0, 10.1.3.1, 10.1.3.2, 10.2.2.0
>            Reporter: Kathey Marsden
>            Priority: Critical
>
> On non-windows systems accidental access of  a database from two JVM's is not prevented
on  JVM's lower than 1.4.2.   The issue can be triggered  by a common user error, for example
accessing a database from two ij sessions.  This can cause unrecoverable corruption.  It is
critical that users upgrade to 1.4.2 if there is a possibility that a user might access Derby
in this way.
> There was no known way to fix this issue until 1.4.2, so it is not likely that it can
be resolved within Derby.  Upgrade of the JVM is the only known solution now.
> Note: Even with 1.4.2 the dual boot issue exists in certain scenarios which are not well
documented.  DERBY-700 has been filed and hopefully other fatal usage cases that can lead
to dual boot can be isolated and resolved.

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