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From Mike Matrigali <mikem_...@sbcglobal.net>
Subject Re: [jira] Created: (DERBY-1781) Process handles appear to be leaking in queries using an IN clause during concurrent DB access
Date Wed, 30 Aug 2006 00:16:33 GMT
I am not familar with the terminology here, what kind of thing is a 
"process handle"?  Any link available to describe it.

Mark Hellkamp (JIRA) wrote:
> Process handles appear to be leaking in queries using an IN clause during concurrent
DB access
> ----------------------------------------------------------------------------------------------
> 
>                  Key: DERBY-1781
>                  URL: http://issues.apache.org/jira/browse/DERBY-1781
>              Project: Derby
>           Issue Type: Bug
>          Environment: Windows XP, Java 1.5.0_05
>             Reporter: Mark Hellkamp
>          Attachments: SqlStressTest.java
> 
> We are currently using Derby embedded in our web application running on Windows. When
processing multiple concurrent requests we have noticed that the Java process handle count
continues to increase until the machine becomes unresponsive. I was able to isolate the problem
to Derby by running the database in network mode in another process. Further investigation
showed that the problem could be reproduced using a select statement that has an IN clause
with multiple entries on the primary key column. Spawning multiple threads running the same
query causes the handle count to increase considerably on the Derby process. The problem occurs
in version 10.1.3.1 and 10.2.1.1 (even worse) in both embedded and network mode. The attached
test program duplicates the problem. Start Derby in network mode (using startNetworkServer.bat)
and run the enclosed test program. The handle count on the Derby process will increase and
never go down short of restarting Derby. Using 10.2.1.1 the han
dle count for the Derby process goes somewhere between 1400-1500 with just two threads in
my environment. 
> 


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