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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5232) Put a stern README file in log and seg0 directories to warn users of corrpution they will cause if they touch files there
Date Wed, 14 Nov 2012 17:06:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497228#comment-13497228
] 

Mamta A. Satoor commented on DERBY-5232:
----------------------------------------

Hi Knut, decided to get rid of the length check on the file, it is probably plenty to check
that the file exists. Added the assert on File exists check though.  Made these changes with
revision 1409254.
                
> Put a stern README file in log and seg0 directories to warn users of corrpution they
will cause if they touch files there
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5232
>                 URL: https://issues.apache.org/jira/browse/DERBY-5232
>             Project: Derby
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 10.8.1.2
>            Reporter: Kathey Marsden
>            Assignee: Mamta A. Satoor
>             Fix For: 10.10.0.0
>
>         Attachments: DERBY5232_patch1_diff.txt, DERBY5232_patch1_stat.txt, DERBY5232_patch2_diff.txt,
DERBY5232_patch2_stat.txt, DERBY5232_patch3_diff.txt, DERBY5232_patch3_stat.txt, DERBY5232_patch4_diff.txt,
DERBY5232_patch4_stat.txt, DERBY5232_patch5_diff.txt, DERBY5232_patch5_stat.txt, DERBY5232_patch6_diff.txt,
DERBY5232_patch6_stat.txt, DERBY5232_patch7_diff.txt, DERBY5232_patch7_stat.txt, DERBY5232_test_patch1_diff.txt,
DERBY5232_test_patch1_stat.txt, DERBY5232_test_patch2_diff.txt, DERBY5232_test_patch2_stat.txt
>
>
> Users often on bad advice or desperation  touch or delete files in the log or seg0 directories
(mostly log).
> I think it would be good for new databases and on upgrade that a file be created in these
directories with a name like:
> TOUCHING_FILES_HERE_WILL_CORRUPT_DB_README.txt
> or some such to warn of the perils of doing this and the corrupting effects and how it
can eliminate any possibility of salvage. It should also encourage users to make a zip backup
of the database directory with no jvm currently accessing it before trying to do anything
with the database if it appears to be already corrupt.  Also point to backup/restore documentation
and encourage restore of a good backup into an empty directory if the database is corrupt.
> I'm not sure if it would help but it couldn't hurt.

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