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Q247375: INETINFO.EXE Ends With MTS Event 4097 Using MS ODBC for DB2

Article: Q247375
Product(s): Microsoft SNA Server
Version(s): 4.0 SP2,4.0 SP3
Operating System(s): 
Keyword(s): 
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, versions 4.0 SP2, 4.0 SP3 
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SYMPTOMS
========

When stress-testing an Active Server Page configured to retrieve DB2 table data
using the Microsoft ODBC Driver for DB2 (included in SNA Server 4.0 Service Pack
3), the IIS process (Inetinfo.exe) may end unexpectedly and log the following
event:

  Event ID: 4097
  Source: Transaction Server
  Description: The run-time environment has detected an inconsistency in its
  internal state and has terminated the process. Please contact Microsoft
  Product Support Services to report this error. Error 80040154 from
  CoCreateInstance of CLSID_MultiThreadedAptHelper (Microsoft Transaction
  Server Internals Information: File: d:\viper\src\runtime\mtxex\vipthrd.cpp,
  Line: 382) Data: 80040154

Although the provider has been registered properly, the 80040154 error indicates
REGDB_E_CLASSNOTREG, or "class not registered."

WORKAROUND
==========

To prevent this failure, use the native Microsoft OLE DB Provider for DB2
(DB2OLEDB) in the Active Server Page, instead of the Microsoft ODBC Driver for
DB2. Using the native DB2OLEDB interface is also much faster, because the
Microsoft ODBC Driver for DB2 automatically communicates through the DB2OLEDB
Provider.

The following is an example of some VBScript commands that use the DB2OLEDB
Provider:

  sub CnnSetup(cnn)
  cnn.ConnectionTimeout = 60
  cnn.CommandTimeout = 60
  cnn.Open "Provider=DB2OLEDB;Password=TESTPW;User ID=TESTUSR;Initial
  Catalog=OLYMPIA;APPC Remote LU Alias=OLYMPIA;APPC Local LU Alias=LOCAL;APPC
  Mode Name=QPCSUPP;Network Transport Library=SNA;Host CCSID=37;PC Code
  Page=1252;Package Collection=WNW3XX;Default Schema=WNW3XX;Default Isolation
  Level=NC;Auto Commit Mode=False;Process Binary as Character=False;Read
  Only=False"

  CnnSetup(ENotesData)

  Dim RS
  Dim strSQL
  Dim dbErrCount
  Dim strDest
  Dim numEditBtn
  Dim numDeleteBtn

  strSQL = "SELECT std_comment_seq_no,std_comment_dest,std_comment,
  SubStr(std_comment,1,250) FROM wnw3xx.erovstdc ORDER BY std_comment_dest ASC,
  4 ASC"
  Set RS = ENotesData.Execute(strSQL)

WARNING: If the DB2OLEDB provider is using SNA connectivity from an SNA Server
client through an SNA Server located on another computer over TCP/IP, large
numbers of concurrent client requests will cause a large traffic load between
the client and server computer. This is fine, although the SNA Server or client
may encounter the "MaxPendingWrites" limit while writing data on the LAN
session, causing the SNA Server or client to drop the LAN session, indicated
when SNA Server logs event 706. To prevent this, override the MaxPendingWrites
registry key, and increase it to 300 or more. For additional information, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q142037 SNA Server Fails to Release Memory in SNA TCP/IP Interface DLL

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server 4.0 Service
Pack 3.

MORE INFORMATION
================

Steps to Reproduce the Problem

1. Configure an Active Server Page, which retrieves DB2 data using the Microsoft
  ODBC Driver for DB2.

2. Using an Internet Server stress tool, such as the Microsoft Web Application
  Stress Tool (Homer), generate a large number of client browser requests
  against the Active Server Page.

Result: Within a minute, the INETINFO process ends abnormally and the event 4097
is logged.


Additional query words:

======================================================================
Keywords          :  
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400SP2 kbSNAServ400SP3
Version           : :4.0 SP2,4.0 SP3
Issue type        : kbprb

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