[unixODBC-support] Memory leak in SQLFetch?

Craddock, Richard C cmi5 at cdc.gov
Tue Dec 14 16:24:01 GMT 2004


I am running UnixODBC v2.2.9 on Fedora Core 2 that should have all of
the latest patches.  I am using freetds v0.62.4 to connect to MS
SQLServer 2000.  I do not understand the cursor lib comment.  Forgive
me, I am new to ODBC.
-Cameron

-----Original Message-----
From: unixodbc-support-bounces at easysoft.com
[mailto:unixodbc-support-bounces at easysoft.com] On Behalf Of Nick Gorham
Sent: Tuesday, December 14, 2004 10:58 AM
To: Support for the unixODBC project
Subject: Re: [unixODBC-support] Memory leak in SQLFetch?

Saunders, Steve wrote:

>
>  
>
>>Craddock, Richard C wrote:
>>    
>>
>
>  
>
>>>Ladies and Gentlemen:
>>>
>>> 
>>>
>>>I have a reproducible memory leak with the attached code.  There are 
>>>exactly 20160 elements that should be returned from the query.  After

>>>running this program there is nearly 3Mb of un-freed memory.  If I 
>>>comment out the SQLFetch() calls then the memory leak goes away.  I 
>>>suspect that it may have something to do with how I am using unixODBC

>>>rather then a memory leak in unixODBC.  But I have stared at the code

>>>for quite sometime to no avail.  Has anyone had a similar problem?  
>>>Have I made a mistake somewhere?  I appreciate your time and
assistance.
>>>
>>> 
>>>
>>>Regards,
>>>
>>>Cameron Craddock
>>>
>>>      
>>>
>
>Nick wrote
>  
>
>>From a quick read, it looks ok, but it does depend on the driver as 
>>well, what driver is this using ?
>>
>>When you have these sorts of problems, its often worth just trying the

>>same thing with another database/driver to see if the leak remains.
>>    
>>
>
>
>Mr. Craddock, 
>
>What version of unixODBC and OS are you using for this memory leak
test? 
>
>We see a similar memory leak problem with unixODBC v2.2.9 regardless of
DB
>driver (DB2 or MyODBC/MySQL.   We have only tested this version of
unixODBC
>on AIX v5.2.  The same tests on unixODBC v2.2.8 on Linux/RedHat does
not
>appear to leak.  
>
>-Steve
>  
>

Hmm,

Is it possible the cursor lib being used, and this is contributing to 
the problem ?

-- 
Nick
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