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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 Wed, 23 May 2012 13:36:41 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
    Issue & fix info: High Value Fix,Workaround attached  (was: High Value Fix,Patch Available,Workaround

Committed patch DERBY-5691-6.diff to documentation trunk at revision 1341858. 
Merged to 10.8 doc branch at revision 1341860.
> 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:,
>         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-5691-6.diff, DERBY-5691-6.stat, DERBY-5691.diff, DERBY-5691.stat, DERBY-5691.zip, cadmindbintegrity.html
> 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
>      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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