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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4050) Multithreaded clob update causes growth in table that does not get reclaimed
Date Tue, 10 Feb 2009 15:29:21 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672293#action_12672293
] 

Kathey Marsden commented on DERBY-4050:
---------------------------------------

Thanks Kristian for running the long test.  I don't see anything in the log indicating we
are hitting one of the places where we give up on reclamation, but I am kind of surprised
the log is so small.  Anyway, unless someone objects, I will commit this to trunk later this
morning.

Thanks

Kathey


> Multithreaded clob update causes growth in table that does not get reclaimed
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-4050
>                 URL: https://issues.apache.org/jira/browse/DERBY-4050
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>         Attachments: ClobGrowth.java, derby-4050_diff.txt, derby-4050_diff2.txt, derby-4050_more_debug.diff,
derby.log-32w100t.txt, derby.log.growth, derby.log.nogrowth, releaseNote.html
>
>
> Doing a multithreaded update of a Clob table causes table growth that does not get reclaimed
except by compressing the table.  The reproduction has a table with two threads. One  thread
 updates row 1 repeatedly with 33,000 character clob. The other thread updates row 2 with
a small clob, "hello".  The problem occurs back to 10.2 but seems much worse on trunk than
10.2.   The trunk database grew to 273MB on trunk after 10000 updates of each row. The 10.2
database grew only to 25MB.  If the update is synchronized there is no growth.
> I will attach the repro.

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