среда, 5 января 2011 г.

How To configure SQL server to store session state

I was trying to implement storing ASP.NET session in SQL server today and faced a few problems during configuration. I had to go through many articles that talk about what is SQL server, what's the need to store session in SQL etc. Common, I know them, I just need a few tips or guidelines how to store sessions - in short!
You might get abundant articles that talk about Storing ASP.NET Session in SQL Server. So what’s new in this blog? To be frank nothing’s new, I am just trying to share my experience so that if someone just wants to implement it and knows the concept already.
Initially some years back I thought storing sessions in SQL is a tedious job and requires a lot of administration; however I was proved wrong. Before you can actually store a session state in SQL server using ASP.NET 2.0, you need to configure it. This configuration is done via a command line tool called ASPNET_REGSQL.EXE. However there are stored procedures to create/remove the database [InstallSqlState.sql and UninstallSqlState.sql located at system drive\Windows\Microsoft.NET\Framework\version]
The following table lists the command line switches of the aspnet-regsql.exe that will be normally used in session store configuration: [FYI: aspnet_regsql -? displays many more command switches]
Command line switch
Description
-S
Species the IP address or the name of SQL server in which you want to store the session state
-U
Specifies the user ID to be used when connecting to the SQL Server
-P
Specifies the password to be used when connecting to the SQL Server
-E
Indicates that you want to use integrated security when connecting to the SQL Server
-ssadd
Adds support for the SQLServer mode session state
-ssremove
Removes support for the SQLServer mode session state
-sstype
Type of session state support. This option can be:
t for temporary storage (Stores session data in the SQL Server tempdb database)
p for persistent storage (Stores session data in the ASPState database)
c for custom storage (Stores session data in a custom database)
-d
The name of the custom database to use if -sstype switch is "c"

The steps are as follows:
Step1: I like to go for custom storage (I don’t want to use the default ASPState database). I would be naming my database as SQLSessionTable
I would use either of the following statements/commands to create the table in SQL
1. C:\Program Files\Microsoft Visual Studio 8\VC>
aspnet_regsql  -ssadd  -d SQLSessionTable  -S serverName –sstype  c  -U domain\user -P Password
2. C:\Program Files\Microsoft Visual Studio 8\VC>
aspnet_regsql -ssadd -d SQLSessionTable -S serverName -sstype c  –E
If I wanted to use the default ASPState database, I would skip the -d option. The command would be as follows:
       aspnet_regsql -ssadd  -S serverName -sstype  c  –E
Step2: The next step would be to configure your web.config file to reflect the sessionState information
<sessionState
mode="SQLServer"
allowCustomSqlDatabase="true"
sqlConnectionString="Data Source=serverName;Initial Catalog=SQLSessionTable;Integrated Security=True;"
cookieless="false"
timeout="20" />
In case I had used the default database (ASPState), I would exclude the entries highlighted above. Now proceed with coding your ASP.NET application to support out-of process session state.
A few useful articles,
Session-State Modes
HOW TO: Configure SQL Server to Store ASP.NET Session State

Let me know if I have missed something

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