在基于NLB（网络负载平衡）环境下的ASP.NET Web应用程序开发，我们需要将Session存储在数据库中供多个Web应用程序调用，以下为配置方法及注意事项。
1.创建用于存储ASP.NET Session的数据库（远程、本地皆可，使用数据库用户身份认证）
在Windows\Microsoft.NET\Framework/V2.0.50727目录下使用如下命令：
aspnet_regsql.exe -S 〈SQL Server IP> -U 〈User Name> -P 〈Password> -E -ssadd -sstype c -d 〈Database Name> 命令执行后就会成功建立起用于存储ASP.NET Session变量的数据库了。 2.Web.Config文件配置项 我们需要在ASP.NET Web应用程序中的Web.Config文件修改sessionState配置项以使Session状态数据库生效。 配置节点如下： 〈sessionState mode="SQLServer" sqlConnectionString="server=〈Server IP>;database=〈Database Name>;uid=〈User Name>;pwd=〈Password>;" allowCustomSqlDatabase="True" cookieless="false" timeout="20" /> 3.注意在进行系统测试（主要是负载测试）的时候，因为数据库访问负载的增加，需要调整SQL Server相应超时的配置项以适应负载。（默认值为10，请适度进行调整。）ASP.NET Session状态数据库数据模型1.ASPStateTempSessions表定义 3.使用的存储过程
Stored ProcedureDescriptionCreateTempTablesCreates the ASPStateTempSessions and ASPStateTempApplications tables; called during setup, but not called by SqlSessionStateStore.DeleteExpiredSessionsUsed by SQL Server Agent to remove expired sessions.GetHashCodeHashes an application name and returns the hash; called by TempGetAppID.GetMajorVersionReturns SQL Server's major version number.TempGetAppIDConverts an application name into an application ID; queries the ASPStateTempApplications table and inserts a new record if necessary.TempGetStateItemRetrieves read-only session state from the database (ASP.NET 1.0; ASP.NET 1.1/SQL Server 7).TempGetStateItem2Retrieves read-only session state from the database (ASP.NET 1.1).TempGetStateItem3Retrieves read-only session state from the database (ASP.NET 2.0).TempGetStateItemExclusiveRetrieves read/write session state from the database (ASP.NET 1.0; ASP.NET 1.1/SQL Server 7).TempGetStateItemExclusive2Retrieves read/write session state from the database (ASP.NET 1.1).TempGetStateItemExclusive3Retrieves read/write session state from the database (ASP.NET 2.0).TempGetVersionMarker whose presence indicates to ASP.NET 2.0 that the session state database is ASP.NET 2.0-compatible.TempInsertStateItemLongAdds a new session, whose size is > 7,000 bytes, to the database.TempInsertStateItemShortAdds a new session, whose size is 〈= 7,000 bytes, to the database.TempInsertUninitializedItemAdds a new uninitialized session to the database in support of cookieless sessions.TempReleaseStateItemExclusiveReleases a lock on a session; called when ASP.NET determines that a request has timed out and calls the provider's ReleaseItemExclusive method.TempRemoveStateItemRemoves a session from the database when the session is abandoned.TempResetTimeoutResets a session's timeout by writing the current date and time to the corresponding record's Expires field.TempUpdateStateItemLongUpdates a session whose size is > 7,000 bytes.TempUpdateStateItemLongNullShortUpdates a session whose old size is 〈= 7,000 bytes, but whose new size is > 7,000 bytes.TempUpdateStateItemShortUpdates a session whose size is 〈= 7,000 bytes.TempUpdateStateItemShortNullLongUpdates a session whose old size is > 7,000 bytes, but whose new size is 〈= 7,000 bytes.
ASP.NET 状态数据库FAQ1.如果把SESSION值存放到数据库中去，用户关闭了程序那怎么样清空数据库里的SESSION值呢？
实际ASP.NET在创建状态数据库的时候会在SQL Server代理（SQL Server Agent）的作业中添加一个作业，名称为
<
状态数据库名>
_Job_DeleteExpiredSessions。如果打开SQL Server代理服务数据库可以通过添加的状态记录的超时时间字段（Exprires）定期对超时的状态数据进行删除。 2.ASPStateTempSessions表中的SessionId字段如何使用？ 数据库中此表的SessionID字段的值，由SessionID和AppID共同组成，最后8位为AppID所以，后8位之前一定是SessionID。例如，存储在数据库中的值为"ekr30c3mwvnc3145yrswew3a037e5e5a"，后8位的"037e5e5a"为AppID，而前面的"ekr30c3mwvnc3145yrswew3a"为应用程序中你可以使用Session.SessionID获得的字符串。 3.如何判断Session何时被更新的？ Session记录被更新时会同时更新Expires和LockDateLocal，Expires字段为UTC时间，如果想通过本地之间进行比较判断还是需要使用LockDateLocal。 4.获得Web.config配置文件节点信息的程序？
列名类型描述SessionIdnvarchar(88)Session ID + application IDCreateddatetimeDate and time session was created (UTC)ExpiresdatetimeDate and time session expires (UTC)LockDatedatetimeUTC date and time session was lockedLockDateLocaldatetimeLocal date and time session was lockedLockCookieintLock IDTimeoutintSession timeout in minutesLockedbit1=Session locked, 0=Session not lockedSessionItemShortvarbinary(7000)Serialized session state (if <= 7,000 bytes)SessionItemLongimageSerialized session state (if > 7,000 bytes)FlagsintSession state flags (1=Uninitialized session)
2.
ASPStateTempApplications表定义
列名类型描述AppIdintApplication IDAppNamechar(280)Application name
Code
''获得Web.config文件配置实例Dim configuration As System.Configuration.Configuration = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~/web.config")''获得状态配置节点实例Dim mSessionStateSection As System.Web.Configuration.SessionStateSection = CType(configuration.GetSection("system.web/sessionState"),System.Web.Configuration.SessionStateSection)''获得状态模式Response.Write(mSessionStateSection.Mode)''获得状态超时时间Response.Write(mSessionStateSection.Timeout)
转载于:https://www.cnblogs.com/liyejun/archive/2009/03/24/1420792.html
