Advance Techniques net

8/14/2019 Advance Techniques net

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Advanced PerformanceAdvanced Performance

Techniques in ASP.NET 2.0Techniques in ASP.NET 2.0

William Zhang, Ph.D.Senior Consultant

Microsoft Consulting Services

William Zhang, Ph.D.William Zhang, Ph.D.Senior ConsultantSenior Consultant

Microsoft Consulting ServicesMicrosoft Consulting Services


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AgendagendaSQL Server cache dependencyQL Server cache dependency(SqlCacheDependencyqlCacheDependency)Custom cache dependencyustom cache dependency(CacheDependencyacheDependency)Postost-cache substitutionache substitutionAsynchronous page with parallelsynchronous page with parallel-processed tasksrocessed tasksData paging via stored procedureata paging via stored procedureReturning multiple result sets from DBeturning multiple result sets from DBScript callback (out of band call)cript callback (out of band call)


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SqlCacheDependencyqlCacheDependencySystem.Web.Cachingystem.Web.Caching

SQL 7 & 2000 SupportQL 7 & 2000 SupportTable change dependencies on SQL 7 & 2000able change dependencies on SQL 7 & 2000Requiresequires cache> configuration settingsonfiguration settingsOnene-time setup of SQL Server databaseime setup of SQL Server databasePolling modelolling model

SQL ServerQL Server YukonukonResult Set dependencies for SQL Yukonesult Set dependencies for SQL YukonSupported through ADO.NETupported through ADO.NET SqlCommandqlCommandNo setup requiredo setup requiredNotification modelotification model


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SQL Server 7 & 2000QL Server 7 & 2000Table level notifications onlyable level notifications only

Notification when data in table changesotification when data in table changesRowow-level notificationevel notification is nots not supportedupported

Requires one time setup of SQL 7 /equires one time setup of SQL 7 /2000000Triggers on tables that participateriggers on tables that participate

Stored procedures called to checktored procedures called to checkOf Note:f Note:

Entries in cache table < # of tables inntries in cache table < # of tables inDBBEntries in cache = # items in cache tablentries in cache = # items in cache table


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aspnet_regsqlcache.exespnet_regsqlcache.exeEnable databasenable database

aspnet_regsqlcache.exespnet_regsqlcache.exe -S .. -E -d Northwindorthwind eddEnable tablenable tableaspnet_regsqlcache.exespnet_regsqlcache.exe -S .. -E -t ProductsProducts -d Northwindorthwind ettList enabled tablesist enabled tables

aspnet_regsqlcache.exespnet_regsqlcache.exe -S .. -E -d Northwindorthwind -ltt


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Use code in place ofaspnet_regsql.exe


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How it works: SQLow it works: SQL YukonukonASP.NETASP.NET SQL ServerSQL Server YukonYukon

IISIIS

Northwind

HttpListenerHttpListener

Http.sysHttp.sys Notification Delivery ServiceNotification Delivery ServiceTCP Port 80

SqlCommandSqlCommandSqlCommand

SqlCacheDependencySqlCacheDependency

PagePage

DataSetDataSet

CacheCacheChangeChange

DetectionDetection


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Example: Yukon Notificationsxample: Yukon Notifications


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SQL Server Cache Dependency (SQL

Server 2000)Source: SqlCacheDependencyTest.aspx for

SQL Server 2000


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Custom Cache Dependenciesustom Cache Dependencies


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CacheDependencyacheDependency ChangeshangesSystem.Web.Cachingystem.Web.Caching

No breaking changes too breaking changes toCacheDependencyacheDependencyBackwards compatible with v1.X codeackwards compatible with v1.X code

ASP.NET 2.0SP.NET 2.0 CacheDependencyacheDependency class:lass:New virtual properties/methodsew virtual properties/methodsPublic default constructorublic default constructorClass can be derived, i.e. unsealedlass can be derived, i.e. unsealed


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Custom Cache Dependenciesustom Cache DependenciesAnyone can create a dependencynyone can create a dependency

WebServiceDependencyebServiceDependencyOracleCacheDependencyracleCacheDependency

This is just what we did forhis is just what we did forSqlCacheDependencyqlCacheDependencyAggregateDependencyggregateDependency


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Custom Cache Dependency (Event Log

change invalidates cache)Source: CustomCacheDependency.aspx


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Postost-Cache Substitutionache Substitution


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ASP.NET 2.0SP.NET 2.0Postost-Cache Substitutionache Substitution

Output cache entire pageutput cache entire pageIdentify regions that are dynamicdentify regions that are dynamic

Uses ases a PlaceHolderlaceHolder bufferuffer


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Postost-Cache Substitutionache SubstitutionNewew Response.WriteSubstitutionesponse.WriteSubstitution())

Wiresires-up substitution event on pagep substitution event on pageAdds a substitution buffer to thedds a substitution buffer to theresponseesponseSubstitution event returns string valueubstitution event returns string valueto addo add

Newew > controlontrolDragrag-drop where content should gorop where content should goSet theet the MethodNameethodName propertyroperty builtuilt-in supportn support


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Post-Cache Substitution

Source: PostCacheSubstitution.aspx


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Asynchronous ASPX Page andsynchronous ASPX Page andParallel Tasksarallel Tasks


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Asynchronous ASPX Pagesynchronous ASPX PageBy default, page processing iny default, page processing inASP.NET is synchronousSP.NET is synchronousAssigned thread does nothing elsessigned thread does nothing elseuntil the request completesntil the request completesASP.NET has a limited number ofSP.NET has a limited number ofthreads at its disposal to processhreads at its disposal to processrequestsequestsRequests are rejected with 503equests are rejected with 503"Server Unavailable" errors whenServer Unavailable" errors whenqueue is filled up to its capacityueue is filled up to its capacity(100)100)Asynchronous ASPX page is for thissynchronous ASPX page is for this


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Effect ofprocessing inparallel (calling aweb method 3times each taking3 seconds)


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Asynchronous ASPX Page with parallel

processingSource: AsynchronousPage.aspx


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Data Paging via Stored Procedureata Paging via Stored Procedure


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Data Paging via SPata Paging via SPDataGridataGrid (verer 1.1) and.1) and GridView(verridView(ver2.0) both do data paging.0) both do data pagingHowever, the price is largeowever, the price is large ViewStateiewState.Your data layer will need to returnour data layer will need to returnall of the data and then thell of the data and then the DataGridataGridwill filter all the displayed recordsill filter all the displayed recordsbased on the current page.ased on the current page.Use SP to return proper page of data,se SP to return proper page of data,only, not all data.nly, not all data.


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Temp table holdsOrder table key and anIDENTITY column,

which is used forpaging

Lower Bound


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Data paging using stored procedure

Source: DataPaging.aspx andDataPagingClient.aspx


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Returning Multipleeturning Multiple ResultsetsesultsetsImprove scalability by reducing crossmprove scalability by reducing crossprocess/network requestsrocess/network requestsBothoth DataSetataSet andnd SqlDataReaderqlDataReader allowllowyou to return multipleou to return multiple resultsetsesultsets


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UsingSqlDataReader

to returnmultiple

resultsets


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Returning multiple resultsets

Source: MultipleResultSets.aspx


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Script Callbackcript Callback

Script Callbackcript Callback


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Making server round trip without pageaking server round trip without pagepostbackostback


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Script Callback Implementationcript Callback ImplementationImplement interfacemplement interfaceSystem.Web.UI.ystem.Web.UI.ICallbackEventHandlerCallbackEventHandlerImplementmplement public virtual stringublic virtual stringRaiseCallbackEventaiseCallbackEvent(stringstringeventArgument)ventArgument)Bindind jscriptscript string to HTML controlstring to HTML controls(not input type) usingnot input type) usingPage.ClientScript.GetCallbackEventRefage.ClientScript.GetCallbackEventReferencerence() method) method

Script Callback Implementationcript Callback Implementationcript Callback Implementation


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Implement the

interface

Implement thevirtual method

Bind jscript toHTML controls


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Script callback (out of band call)

Source: ScriptCallback.aspx


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SummaryummarySQL Server cache dependency (QL Server cache dependency (SqlCacheDependencyqlCacheDependency)Custom cache dependency (ustom cache dependency (CacheDependencyacheDependency)Postost-cache substitutionache substitutionAsynchronous page with parallelsynchronous page with parallel-processed tasksrocessed tasksData paging via stored procedureata paging via stored procedureReturning multiple result sets from DBeturning multiple result sets from DBServer round trip withouterver round trip without postbackostback: script callbackscript callbackOTHERS (not covered in this talk):THERS (not covered in this talk):Windows Server 2003 featuresindows Server 2003 features

Kernel mode caching in IIS 6.0ernel mode caching in IIS 6.0Gzipzip compressionompressionUsese mscorsvr.dllscorsvr.dll instead ofnstead of mscorwks.dllscorwks.dllIn stored proceduresn stored proceduresUse Set NOCOUNT ON to prevent DONE_IN_PROC messagesse Set NOCOUNT ON to prevent DONE_IN_PROC messagesDo not useo not use sp_prefixp_prefix in stored proc names to prevent checkingn stored proc names to prevent checkinginto master dbnto master dbConnection poolingonnection pooling


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