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https://issues.apache.org/jira/browse/DERBY-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679197#action_12679197
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Kristian Waagan commented on DERBY-4075:
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I'm not sure which JVMs will work on which platforms etc, but are you able to 
run with a different JVM, or at least a different version, to rule out a JVM 
bug?
Also, are you seeing the error on several machines?

My test runs still haven't produced any of the page format errors, but I 
haven't run them without SQL authorization yet. If the SQL authorization is 
causing the backup to not be run, that may be significant.
Another idea is to increase the load of the test and see if the error occurs 
sooner then (I don't know how to actually increase the load, but assume there 
are some parameters we can adjust).

It turns out one of my tests ran out of disk space. The database had grown to 
25 GB, which seems to be a lot larger than on the other machine I'm running on.
I don't know what the expected database growth rate for this test is.

> ERROR XSDBB: Unknown page format at page Page(613,Container(0, 1024)) when 
> running MailJdbc (Embedded) system tests
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4075
>                 URL: https://issues.apache.org/jira/browse/DERBY-4075
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.5.0.0
>         Environment: windows 2000 professional, ibm 1.6 (sr2), revision 10.5: 
> 745360
>            Reporter: Myrna van Lunteren
>            Priority: Blocker
>             Fix For: 10.5.0.0
>
>         Attachments: Activity.out, derbylog.zip, performance.out
>
>
> I started the org.apache.derbyTesting.system.mailJdbc Embedded test and after 
> about 1 day it ran into an apparently corrupted database.
> 2009-02-19 14:02:44.221 GMT Thread[Refresh Thread,5,main] (XID = 349909), 
> (SESSIONID = 1), (DATABASE = mailsdb), (DRDAID = null), Failed Statement is: 
> insert into 
> REFRESH.INBOX(from_name,to_name,date,Message,attach_id,size_problem) values 
> (?,?,?,?,?,?) with 6 parameters begin parameter #1: ABCE :end parameter begin 
> parameter #2: WXYY :end parameter begin parameter #3: 2009-02-19 06:02:43.705 
> :end parameter begin parameter #4: 
> CLOB(org.apache.derby.iapi.types.readertoutf8str...@41ba41ba) :end parameter 
> begin parameter #5: 0 :end parameter begin parameter #6: This column is used 
> only to by pass the space problem. If the problem still exists, then we are 
> going to have a serious issue 
> here.*****************************************************************************************************
>  :end parameter 
> ERROR XSDBB: Unknown page format at page Page(613,Container(0, 1024)), page 
> dump follows: Hex dump:
> The error up to that point appear to me no different from other errors that 
> this test is expected to produce (40001, 23505, 4XL01) except that the very 
> first error is a grant error.
> I think we can't have a release until this corruption is explained away or 
> fixed.

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