FIX: Memory Leak When Using XA TM and SQL Server/DTC

ID: Q197811

The information in this article applies to:
  • Microsoft Transaction Server 2.0
  • Microsoft COM libraries, version 1.0

SYMPTOMS

This hotfix corrects several problems that may occur when you use Microsoft SQL Server with an XA-compliant transaction manager such as BEA's Tuxedo. These problems only occur when the transaction manager performs distributed transactions with Microsoft SQL Server using the XA protocol.

Under some circumstances Microsoft DTC returns the error XAERR_NOTA (no transaction). The Microsoft DTC transaction manager process may also leak memory when Tuxedo performs XA transactions with Microsoft SQL Server.


CAUSE


STATUS

Microsoft has confirmed this to be a problem in Microsoft Transaction Server version 2.0. A supported fix is now available, but has not been fully regression- tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Product Support for more information. This problem has been fixed in COM+.


MORE INFORMATION

Who Should Install This Release

You should install hotfix 0805 if you are using Microsoft SQL Server with an XA-compliant transaction manager such as BEA's Tuxedo.

This hotfix should only be installed on systems running Microsoft Windows NT version 4.0 (Service Pack 4 is recommended). It should not be installed on systems running Windows NT version 3.51 or Windows 2000.

Note that this hotfix is based on the version of Microsoft DTC included with Windows NT version 4.0 Service Pack 4. By installing this hotfix, you are upgrading Microsoft DTC to Windows NT version 4.0 Service Pack 4 level, in addition to correcting the problems described here.

Hot to Install on a Non-clustered System

  1. Create an empty temporary directory on your system.


  2. Run the self-extracting executable file (I0805.exe (i386) or A0805.exe (alpha)) and type the name of the temporary directory when you are prompted to do so.

    The program will unzip the following files into the temporary directory:
    Dtcsetup.exe
    Qfe0805.txt


  3. Stop the Microsoft DTC Service, if it is running. Stop all services that depend on Microsoft DTC (including Microsoft Transaction Server, Microsoft SQL Server, Microsoft Message Queue, and Microsoft COM Transaction Integrator (COMTI)).


  4. Close Windows NT Control Panel, if it is open.


  5. Run Dtcsetup.exe.


  6. Restart the system.


  7. Restart all services that depend on Microsoft DTC.


How to Install on a Cluster with an Already Clustered Microsoft DTC

  1. Create an empty temporary directory on both nodes of the cluster.


  2. Run the self-extracting executable file (I0805.exe (i386) or A0805.exe (alpha)) on both nodes of the cluster and enter the name of the temporary directory when you are prompted to do so.

    The program will unzip the following files into the temporary directory:
    Dtcsetup.exe
    Qfe0805.txt


  3. Use the MSCS Cluster Administrator to stop the Microsoft DTC cluster resource, if it is running. Stop all services that depend on Microsoft DTC (including Microsoft Transaction Server, Microsoft SQL Server, Microsoft Message Queue, and Microsoft COMTI).


  4. Close Windows NT Control Panel on all systems in the cluster.


  5. Run dtcsetup.exe on the node that controls the Microsoft DTC cluster resource. When you are prompted to install Microsoft DTC on the other nodes in the cluster, run Dtcsetup.exe on those nodes.


  6. Restart all systems.


  7. Restart all services that depend on Microsoft DTC.


How to Install on a Cluster with a Non-clustered Microsoft DTC

  1. Create an empty temporary directory on both nodes of the cluster.


  2. Run the self-extracting executable file (I0805.exe (i386) or A0805.exe (alpha)) on both nodes of the cluster, and type the name of the temporary directory when you are prompted to do so.

    The program will unzip the following files into the temporary directory:
    Dtcsetup.exe
    Qfe0805.txt


  3. Stop the Microsoft DTC Service on all systems in the cluster. Stop all services that depend on Microsoft DTC (including Microsoft Transaction Server, Microsoft SQL Server, Microsoft Message Queue, and Microsoft COMTI).


  4. Close Windows NT Control Panel on all systems in the cluster.


  5. When you install this release on a clustered system, the Setup program automatically installs a clustered version of Microsoft DTC. The clustered version of Microsoft DTC requires an MSCS Resource Group that contains both a Network Name Resource and a Shared Disk Resource. Before installing this release, ensure that at least one such MSCS Resource Group exists. Dtcsetup.exe will assign Microsoft DTC to the first MSCS Resource Group that it finds that contains both a Network Name Resource and Shared Disk Resource. After ensuring that the necessary Resource Group exists, run Dtcsetup.exe on the node controlling that Resource Group.


  6. When you are prompted to install Microsoft DTC on the other nodes in the cluster, run Dtcsetup.exe on those nodes.


  7. Restart all systems.


  8. Restart all services that depend on Microsoft DTC.


Additional query words:

Keywords : kbMTS kbGrpCom kbDSupport kbbug2.00
Version : winnt:2.0; :1.0
Platform : winnt
Issue type : kbbug


Last Reviewed: October 14, 1999
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