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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4050) Multithreaded clob update causes growth in table that does not get reclaimed
Date Fri, 06 Feb 2009 19:40:59 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kathey Marsden updated DERBY-4050:
----------------------------------

    Attachment: derby.log.nogrowth
                derby.log.growth

Thanks Mike for the hints.

with derby.debug.true=DaemonTrace we never reach the "aborted" case and from the log it looks
like it is happily trying to do the space reclamation.
Attached are the derby logs with and without growth with the property set.
There is no appreciable difference to my untrained eye.  I'll keep digging.



> 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
>         Attachments: ClobGrowth.java, derby.log.growth, derby.log.nogrowth
>
>
> 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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