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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5213) Write tests to verify the interaction of TRUNCATE TABLE and online backup
Date Thu, 30 Aug 2012 17:19:07 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445114#comment-13445114
] 

Mike Matrigali commented on DERBY-5213:
---------------------------------------

the tests in the preliminary patch look good.  This is just from a reading of the code, did
not compile/run it.

Some nits:
o would be nice to have hdr comment on testUncommittedTruncateBackupEnableLog
o assertDirectoryDeleted() seems like something that should be in a test utility that could
be
   used in all tests rather than specific tests.

stuff that should not hold up a commit:
o An interesting test would be to have truncate table happen "during the backup".  This is
a lot harder to write as timing is very
   critical.  Spent some time thinking about this but could not come up with a user level
code way to test this for sure.  Could 
   hack the actual code to help testing but that is not a great idea.  
o could add tests of freeze and unfreeze with respect to truncate.

                
> Write tests to verify the interaction of TRUNCATE TABLE and online backup
> -------------------------------------------------------------------------
>
>                 Key: DERBY-5213
>                 URL: https://issues.apache.org/jira/browse/DERBY-5213
>             Project: Derby
>          Issue Type: Task
>          Components: SQL, Store
>    Affects Versions: 10.9.1.0
>            Reporter: Rick Hillegas
>            Assignee: Myrna van Lunteren
>         Attachments: DERBY_5213.diff_1
>
>
> An uncommitted TRUNCATE TABLE command does not block online backup. We should verify
that the online and backed up databases are both in a consistent state. At a minimum, we should
test the following:
> o uncommitted truncate table followed by online backup and then access the backup copy
and access the table.  should see the old data.
> o uncommitred truncate table, followed by online backup that keeps logs,
>   then commit the truncate, and then access the table in the backup.
> For more information, please see this email thread: http://old.nabble.com/truncating-a-table-vs-online-backup-to31524933.html#a31524933

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