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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-5691) Document that Write Caching must be disabled to avoid possible database corruption
Date Tue, 22 May 2012 13:51:41 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kim Haase resolved DERBY-5691.
------------------------------

          Resolution: Fixed
       Fix Version/s: 10.9.0.0
                      10.8.2.3
    Issue & fix info: High Value Fix,Workaround attached  (was: High Value Fix,Patch Available,Workaround
attached)

Thanks again, Dag. I'm committing this to both 10.9 and 10.8, since the advice is not specific
to this release. Hope that's okay.

Committed patch DERBY-5691-5.diff to documentation trunk at revision 1341468. 
Merged to 10.8 doc branch at revision 1341476.
                
> Document that  Write Caching  must be disabled to avoid possible database corruption
> ------------------------------------------------------------------------------------
>
>                 Key: DERBY-5691
>                 URL: https://issues.apache.org/jira/browse/DERBY-5691
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>         Environment: Microsoft Windows
>            Reporter: Stan Bradbury
>            Assignee: Kim Haase
>              Labels: Write_caching
>             Fix For: 10.8.2.3, 10.9.0.0
>
>         Attachments: DERBY-5691-2.diff, DERBY-5691-2.stat, DERBY-5691-2.zip, DERBY-5691-3.diff,
DERBY-5691-3.zip, DERBY-5691-4.diff, DERBY-5691-4.zip, DERBY-5691-5.diff, DERBY-5691-5.zip,
DERBY-5691.diff, DERBY-5691.stat, DERBY-5691.zip
>
>
> Suggestion that we document a recommendation that Windows Write Caching be disabled on
machines using Derby.
> The following article warns about Write Caching on Windows as a possbile source of database
corruption:
>      http://support.microsoft.com/kb/281672
> It is possible that this could be the cause of some unexplained Derby corruptions identified
after power failure of other system interupt.
> Links explaining how to disable Write Caching:
>   Win 2K: http://support.microsoft.com/kb/259716
>    Win 2008: http://support.microsoft.com/kb/324805
> From the Windows 2008 article:
> With some third-party programs, disk write caching has to be turned on or off. Additionally,
turning disk write caching on may increase operating system performance; however, it may also
result in the loss of information if a power failure, equipment failure, or software failure
occurs. This article describes how to turn disk write caching on or off.

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