NHibernate +Log4Net 解决速度慢的问题

http://kashfarooq.wordpress.com/2008/12/05/improve-the-performance-of-nhibernate-by-getting-your-log4net-settings-right/

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<? xml version="1.0" encoding="utf-8"  ?>
< configuration >
   < configSections >
     < section  name ="log4net"  type ="log4net.Config.Log4NetConfigurationSectionHandler,log4net-net-1.0" />
   </ configSections >
   < log4net >
     < root >
       < level  value ="ALL"   />
       < appender-ref  ref ="ADONetAppender"   />
     </ root >
     < appender  name ="ADONetAppender"  type ="log4net.Appender.ADONetAppender" >
       < bufferSize  value ="1"   />
       < connectionType  value ="System.Data.SqlClient.SqlConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"   />
       < connectionString  value ="server=.; uid=sa; pwd=........; database=ATMSV2"   />
       < commandText  value ="INSERT INTO Log([Date],[Thread],[Level],[RequestUrl],[Message],[Exception],[LoggerID]) VALUES (@log_date, @thread, @log_level, @RequestUrl, @message, @exception,@LoggerID)"   />
       < parameter >
         < parameterName  value ="@log_date" />
         < dbType  value ="DateTime" />
         < layout  type ="log4net.Layout.RawTimeStampLayout" />
       </ parameter >
       < parameter >
         < parameterName  value ="@thread" />
         < dbType  value ="String" />
         < size  value ="255" />
         < layout  type ="log4net.Layout.PatternLayout" >
           < conversionPattern  value ="%thread" />
         </ layout >
       </ parameter >
       < parameter >
         < parameterName  value ="@log_level" />
         < dbType  value ="String" />
         < size  value ="50" />
         < layout  type ="log4net.Layout.PatternLayout" >
           < conversionPattern  value ="%level" />
         </ layout >
       </ parameter >     
       < parameter >
       < parameterName  value ="@RequestUrl" />
       < dbType  value ="String" />
       < size  value ="255" />
       < layout  type ="ATMS.Common.HJRightLayout,ATMS.Common" >
         < conversionPattern  value ="%RequestUrl" />
       </ layout >
       </ parameter >
       < parameter >
         < parameterName  value ="@LoggerID" />
         < dbType  value ="String" />
         < size  value ="255" />
         < layout  type ="ATMS.Common.HJRightLayout,ATMS.Common" >
           < conversionPattern  value ="%LoggerID" />
         </ layout >
       </ parameter >
       < parameter >
         < parameterName  value ="@message" />
         < dbType  value ="String" />
         < size  value ="4000" />
         < layout  type ="ATMS.Common.HJRightLayout,ATMS.Common" >
           < conversionPattern  value ="%Tips" />
         </ layout >
       </ parameter >
       < parameter >
         < parameterName  value ="@exception" />
         < dbType  value ="String" />
         < size  value ="2000" />
         < layout  type ="log4net.Layout.ExceptionLayout" />
       </ parameter >
       <filter type="log4net.Filter.LoggerMatchFilter">
        <LoggerToMatch value="NHibernate" />
        <AcceptOnMatch value="False" />
      </filter>
     </ appender >
   </ log4net >
</ configuration >