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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4050) Multithreaded clob update causes growth in table that does not get reclaimed
Date Fri, 06 Feb 2009 00:53:59 GMT
Multithreaded clob update causes growth in table that does not get reclaimed
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                 Key: DERBY-4050
                 URL: https://issues.apache.org/jira/browse/DERBY-4050
             Project: Derby
          Issue Type: Bug
          Components: Store
    Affects Versions: 10.4.2.0, 10.3.3.0, 10.2.2.0, 10.5.0.0
            Reporter: Kathey Marsden


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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