How to write excellent ASP applications (2)

Parts


  


  . Performance


  . Scalability


  . Separation of business logic and page performance


  . Reuse
by ASP or other environment

  . Transaction processing


  . Type safety


  . Accessing operating system features


  . Protection of intellectual property


  . Use Server.CreateObject in the following situations:


  . MTS Transaction Processing


  . Context Security


  . ASP internal Parts


  . OnStartPage, OnEndPage


  . Runat=server> delay object initialization using <object


  . Save to session or application variable


  


Performance


  


  . Response Buffer: Response.buffer=true


  . Close Connection and: Set connection=nothing


  . Using local variables


. Replace Server.CreateObject
with <object >

  . Do not use session and application variables


  . Do not store COM objects in session or application variables


  . Turn off script debugging


  . Avoid repeated string additions


  . Use Response.IsClientConnected
at the top of a time-consuming page

  . Using MSMQ


  . Do not store large arrays in session or application


  . Do not ReDim array


  . Assign an object of a collection type to a temporary variable


  . Reduce the maximum number of threads in the microprocessor (run Regedt32, hkey_local_machine\system\ currentcontrolset\services\w3svc\asp\parameters, Increase the ProcessorThreadMax, reduce the value, see the performance change, or increase the value. )


  . Set the AspScriptEngineCacheMax so that it equals the number of processorthreadmax*cpu. The default is 30; (Under the System path: \system32\inetsrv/adminisamples, type adsutil.vbs, set/w3svc/aspscriptenginecachemax);


  . Reduce session.timeout;


  . In MMC, set the ASP application buffering to be valid.


  


Give some work to the client:


  


  . CSS, DHTML


  . XML


  . RDS


  . Remote Scripting


  . Xmlhttp


  . Client-side validation


  . Reduce file size


  . Avoid HTTPS and SSL
as much as possible

  . Use Response.End to test performance


  


Database


  


  . Reduce access to database access;


  . The result of a cached transformation;


  . Use ODBC connection pooling and OLE DB resource pools;


  . Use a System DSN or non-DSN, and do not use DSN or file DSN;


  . Make ADO run in dual-threading mode (both-threaded): Makefre.bat;


  . A Field object using ADO;


  . GetString or getrows more quickly;


  . RDS and XML to marry the load to the client;


  . Do not use SELECT * to write fields;


. Use sq as much as possible. Server 7, do not use Access;


  . Use sq. Server features: Stored procedure, Job, Join, sort, group


  . Use sq. Analysis, optimizing the performance of SQL


  . Using index


  . Local use of name-pipes, remote use of sockets


  . Specify command Type
exactly

  


new features of IIS 5


  


  . Reliable reboot


  . ASP Performance Improvement


  . Server.Transfer is better than Server.redirect


  . Server.Execute


  . Server.GetLastError