KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q154869: PRB: Error "Too many client tasks" When Using Jet

Article: Q154869
Product(s): Microsoft Visual Basic for Windows
Version(s): 4.0
Operating System(s): 
Keyword(s): 
Last Modified: 11-JAN-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual Basic Professional Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 
-------------------------------------------------------------------------------

SUMMARY
=======

When trying to use the database features of Visual Basic, you may receive the
error message "Too many client tasks." This occurs when more than 10
applications running on the same machine try to use the Jet database engine.

CAUSE
=====

The Jet database engine versions 1.1, 2.0, and 2.5 can only be used by 10 client
applications simultaneously on any one machine.

WORKAROUND
==========

It is not possible to have more than 10 client applications making use of the
16-bit Jet database engine on one machine. If it is essential that a software
system have more than 10 executables on the same machine with access to one or
more databases, the system could be designed with one "server" exe accessing the
database and multiple "client" programs making requests for data from this
"server" via an inter-process communication (IPC) mechanism. For example, with
Visual Basic version 4.0, this could be achieved using OLE automation.

STATUS
======

This behavior is by design.

(This is not an issue with Jet 3.0 as used by Visual Basic 4.0 32-bit.)

REFERENCES
==========

Visual Basic Online Help.

Additional query words: 4.00 vb4win vb416 kbuk

======================================================================
Keywords          :  
Technology        : kbVBSearch kbAudDeveloper kbVB400Search kbVB400 kbVB16bitSearch
Version           : :4.0
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.