Chris.. I totally agree... perhaps you may want to send him a small example here on how to set a nTier environment.. also is MySQL lic cost very much...? you may want to add some pro's and cons about that as well
--- On Thu, 5/1/08, Chris <[EMAIL PROTECTED]> wrote: From: Chris <[EMAIL PROTECTED]> Subject: RE: [delphi-en] Mssql Locking causes Delphi App to crash To: [email protected] Date: Thursday, May 1, 2008, 7:58 AM Hi, I have been through the same thing; sadly to say the only way I solved it was to change my database backend to mysql from mssql; My Delphi application is currently running in 700 locations countrywide; so the database server is hit with about 5 requests per second with over 14,000 simultaneous connections and its all _smooth_. Your case seems to be that you are connecting MSSQL clients via a wan connection which I can guess is not as fast as a LAN connection; I don't think the problem is the database backend or Delphi; its mysql. Not a problem per-say; its just that MSSQL protocol over a network is "chatty" and is quite heavy - not recommended to be used over the internet and other wan networks where speed doesn't come easy. You might find that the application is exceptionally slow and your ADO connections are timing out over slow networks; I suggest you use a database backend that is network friendly and has a very light protocol. Or build a 3 tier system where the clients run an application that communicate the bare nessessities to an application server which translates into the commands that will hit the database. Hope this helps PO Box 627 00502 Karen, Nairobi, Kenya. Mobile: +254 722 996532 Fixed: +254 20 2050859 [EMAIL PROTECTED] com _____ From: [EMAIL PROTECTED] ps.com [mailto:[EMAIL PROTECTED] ps.com] On Behalf Of edsynergy Sent: 30 April 2008 6:41 p To: [EMAIL PROTECTED] ps.com Subject: [delphi-en] Mssql Locking causes Delphi App to crash I have just gone live with a delphi app which has mssql at the backend. Under load testing it has been well behaved. It is now installed in a large health organisation with users coming in over wan connections to the sql server. For periods the system performs well and then it crashes. All other users of the system also crash out as well. The application will still launch and they can even log on but meaningful work is not possible. I have reviewed the code and cannot find an issue there. It would be easy for me to blame the network/ old pc's ( and not doubt the clients IT support could point a the software) but I rather get to the bottom of it. The sql server is not on a dedicated server. It is one of these new fangled virtual servers and I wonder if this is the issue. After all it is only using the chunk of memory allocated to it by the real server it is on. Would this impact on performance. Any views would be much appreciated. [Non-text portions of this message have been removed] ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
