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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 Fri, 06 Feb 2009 17:15:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671209#action_12671209
] 

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

In an effort to understand why the growth is worse on trunk than 10.4, I synched back to rev
635491 (the revision at which 10.4 branched).   At that trunk revision the problem was still
much worse than on the latest of the 10.4 branch.  I'm not quite sure what's going on.  I
will keep looking at it. It is likely user error. 

> 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
>
>
> 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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