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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, 24 Oct 2012 19:54:12 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483517#comment-13483517
] 

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

To solve the UTF-8 vs UTF-16 problem mentioned by Knut(1), am I right that I should use 
			randomAccessFile.writeUTF(fileContent);
rather than
			randomAccessFile.writeChars(fileContent);
How would I verify that we the writeUTF call, the file has indeed been saved in UTF-8 format.
I thought if I opened the file in notepad and used "save as", in the encoding dropdown, I
will see UTF-8 rather than ASCII, but I still see ASCII even when the file gets it contents
with writeUTF call rather than writeChars call. Thanks

(1)The files were stored in UTF-16, so less complained they were binary files and wouldn't
open them. They'd probably be easier to access if they were stored in UTF-8.


                
> 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
>         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
>
>
> 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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