RE: MSDAORA.DLL (Microsoft OLE DB For Oracle) Connectivity Question

Well, I finally discovered what was happening. The VB program is not using MSDAORA.DLL, but is using the MSDATASHAPE provider (which is similar). The OracleOLE provider does NOT provide the functionality of the MSDATASHAPE provider apparently (functionality the program/developer requires). However, there is a bug in the MSDATASHAPE Provider.  

When you open both a connection (conn.Open) and a recordset (rs.Open), you typically close the connection (conn.Close) and in our case set the recordset to nothing (rs.ActiveConnection=Nothing) to disconnect both from the database, but allows the recordset to be used offline. (Disconnected recordset)  

However, due to the bug, the rs.ActiveConnection=Nothing doesn't disconnect from the database and continues to use up open_cursors until they are exhausted.  

In case someone else stumbles across this, here is the link to the Microsoft Bug:  

http://support.microsoft.com/kb/288409  

Article published under Q288409  

Thanks!  

Chris Taylor
Sr. Oracle DBA
Ingram Barge Company
Nashville, TN 37205
Office: 615-517-3355
Cell: 615-354-4799
Email: chris.taylor_at_ingrambarge.com  

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Powell, Mark D
Sent: Wednesday, November 19, 2008 3:33 PM To: ORACLE-L
Subject: RE: MSDAORA.DLL (Microsoft OLE DB For Oracle) Connectivity Question

When we were experiencing space leaks related to distributed queries MS support told us that MS does not support MSDAORA and to use the OraOledb provider. There is also no 64 bit version of MSDAORA and according to the last document I reviewed at MS support, MS has no plans to create on as the Oracle provider is recommended.  

• Mark D Powell -- Phone (313) 592-5148

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        From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mary Bahrami

	Sent: Wednesday, November 19, 2008 4:01 PM
	To: Chris.Taylor_at_ingrambarge.com; ORACLE-L
	Subject: RE: MSDAORA.DLL (Microsoft OLE DB For Oracle)

        We had a similar problem with db links from sql2005 to ora10.2; I initially used msdaora.dll. It caused errors: WARNING: inbound connection timed out (ORA-3136)

        And eventually prevented new oracle logins; this is fixed in 10.2.0.4. Switching to the OraOledb.oracle provider fixed the problem until we can patch.          

        From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Taylor, Chris David

	Sent: Wednesday, November 19, 2008 11:58 AM
	To: ORACLE-L
	Subject: MSDAORA.DLL (Microsoft OLE DB For Oracle) Connectivity

        We have a VB app using MSDAORA.DLL that doesn't seem to be disconnecting from the DB even though we have a connection close command in the VB program.          

        Any of you seen something like this? We're eating up our "OPEN_CURSOR" count for this session as it process a lot of events and then finally errors out.          

        I really think the problem is that the "OpenConnection" command from VB isn't getting sucessfully closed and reconnected.          

        Thoughts?          

        Chris Taylor

        Sr. Oracle DBA

        Ingram Barge Company

        Nashville, TN 37205

        Office: 615-517-3355

        Cell: 615-354-4799

        Email: chris.taylor_at_ingrambarge.com          

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