DOCUMENT:Q231798  10-AUG-2001  [winnt]
TITLE   :Access Database with Multiple Users Slow on Terminal Server
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4
OPER/SYS:
KEYWORDS:kbinterop kbnetwork

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The information in this article applies to:

 - Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
 - Microsoft Windows NT Server versions 4.0, 4.0 SP4, Terminal Server Edition 
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SYMPTOMS
========

When multiple users on a computer running Windows NT Server 4.0, Terminal Server
Edition attempt to open the same Microsoft Access database on another computer
running Windows NT Server, performance may be severely degraded. However, single
Terminal Server users do not experience any performance degradation.

If several Terminal Server users communicate with different servers containing
Access databases, performance is not impaired, but when they open the same
database, query timing may be an order of magnitude slower.

CAUSE
=====

This behavior occurs because database record locking is affecting performance.
By default, Terminal Server establishes a single session with the Windows NT
Server-based computer that contains the database. Multiple users querying the
database through that one session can cause conflicts. When you use Network
Monitor to track network traffic, the trace shows that the computer is no longer
using opportunistic locking.

RESOLUTION
==========

To resolve this issue, apply the fix described in the following Microsoft
Knowledge Base article:

   Q190162 Terminal Server and the 2048 Open File Limitation

This article describes how to set up different sessions between the servers, and
describes changes to Terminal Server that are made with Service Pack 4. After
you apply the fix and restart the computer, the performance issue should be
resolved.

In addition, if there are multiple users on the computer doing large amounts of
record locking, refer to the following article in the Microsoft Knowledge Base:

   Q191370 Slow Network Performance with Terminal Server

Additional query words:

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Keywords          : kbinterop kbnetwork 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServSearch
Version           : winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4
Issue type        : kbprb

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Copyright Microsoft Corporation 2001.