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I have never heard of VFP stability issues related to having too much physical memory in the system.  In fact, we have used VFP on servers with 2GB with no problems whatsoever.
FoxWeb uses the following code to set the buffer size during startup:
=SYS(3050, 1, VAL(SYS(3050, 1)) / fwConfig.TotalChannels)
Essentially, what this does is it devides the default buffer size value by the total number of channels about to be started.

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Sent by Randy Petty on 10/11/2003 12:16:51 PM:
We're still using VFP 6, both on Windows NT and Windows 2000 Advanced Server. After two of our production servers were upgraded to 2 GB Ram ( most have 1/2 GB) , some developers decided it was wise to add a call to sys(3050,1,600000000)
in some of our primary programs.

Generally the only thing running on our production servers is FoxWeb 1.29c which links the customer on the browser to the FoxPro data on the back end. ( typically about 5 Foxweb channels ) Why would we want to limit the amount of RAM Foxpro can use, especially when some of the tables are over 1GB in size? Some felt that FoxPro would crash without that sys command, and that VFP 6 was never designed to make use of that much RAM. If so, why buy the additional RAM?

Randy Petty