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https://issues.apache.org/jira/browse/DERBY-6136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029222#comment-15029222
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ASF subversion and git services commented on DERBY-6136:
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Commit 1716761 from [~rhillegas] in branch 'code/trunk'
[ https://svn.apache.org/r1716761 ]
DERBY-6136: Introduce the rawDBReader optional tool for last-chance retrieval
of data from unbootable databases; commit
derby-6136-01-ab-teardownCorruptDB.diff.
> Create a custom/optional tool for dumping the data in a corrupted database.
> ---------------------------------------------------------------------------
>
> Key: DERBY-6136
> URL: https://issues.apache.org/jira/browse/DERBY-6136
> Project: Derby
> Issue Type: Improvement
> Components: Tools
> Affects Versions: 10.11.1.1
> Reporter: Rick Hillegas
> Attachments: DataFileVTI.java, DataFileVTI.java, DataFileVTI.java,
> DataFileVTI.java, DataFileVTI.java, DerbyRecovery-0.0.1-SNAPSHOT.jar,
> RawDBReader.java, RawDBReader.java, RawDBReader.java, dataFileVTI.sql,
> derby-6136-01-aa-productize.diff, derby-6136-01-ab-teardownCorruptDB.diff,
> log2[1].dat, log3[1].dat, log4[1].dat, log5[1].dat, log[1].ctrl,
> logmirror[1].ctrl
>
>
> It would be useful to have a tool for dumping the data in a corrupted
> database. This could start out as a custom tool. After we debug the tool and
> get some experience with it, we can consider promoting it to be a (possibly
> undocumented) optional tool which we ship with the product. I think the tool
> should have the following behavior:
> 1) The tool should not subvert the security of the corrupted database. If the
> corrupted database is password-protected, then you would need to present its
> DBO's credentials in order to use the tool. Naturally, an encryption key
> would have to be presented in order to decode an encrypted database.
> 2) The tool should not stop reading a table when it hits a corrupt record.
> Instead, the tool should soldier on and collect a list of warnings on bad
> records.
> Such a tool would be useful in situations where some part of a heap table is
> corrupt but the following heap conglomerates are intact:
> i) SYSSCHEMAS
> ii) SYSTABLES
> iii) SYSCONGLOMERATES
> iv) SYSCOLUMNS
> v) property conglomerate
> Such a tool would be useful for some situations where data can't be dumped
> even after you delete the log files in order to short-circuit recovery.
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