How to enable gzip compression in IIS7

Overview:
          Gzip compression is used to compress your content and then deliver to client. Today's modern browser supports compression. So it is a good idea to deliver the static content after compression, this way you can save lots of bandwidth and your page will be load faster as it has to send compressed data.

How to enable gzip compression in IIS7

The first and most thing is to make sure the compression module is installed on not? check the below mentioned link for installation process.

http://www.iis.net/configreference/system.webserver/httpcompression


Basic steps to enable the HTTP compression on static Content

• Start > Run > Inetmgr > hit enter
• Select your web site
• In Features View, double click Compression
• Check the Enable Static content compression
• Click Apply in the Actions pane.

Above steps must enabled the static compression and your js, css etc static contents should be compressed.

Exceptional Settings

Sometimes you will not get your content compressed after doing above mentioned steps. I recently got the experience and I would like to share the solution with you.

Set read permissions to applicationHost.config file for IIS_ISURS group. 

• You will find this file at C:\Windows\System32\inetsrv\config. 
• Right click to this file and click properties, now click on security tab
• Now click on Edit button
• Now click on Add button under Group or user name
• Now enter IIS_IUSRS 
• Click Check Names button
• Now Select Read & Execute and Read permission
• Click Apply, then Click OK

Check the httpCompression types

    Check the httpCompression section in applicationHost.config file, you should find <add mimeType="application/x-javascript" enabled="true" />. If this is correct then it should be correctly configured in your IIS. 

• Now go to IIS Manager and select your site.
• Click on Features View from bottom
• Now click on MIME Types
• Find the .js entry
• If the .js extension has MIME Type = "application/javascript" then remove that entry.
• Now click Add from Actions pane
• give extension as .js
• give MIME type as application/x-javascript
• click apply.
• Restart the website.

This will start compressing your .js files.

.css files would compressed automatically if other configurations are correct.

How to add Expiry Headers to Static Content from web.config

The easiest way to add the expiry headers or cache control in static content from web.config file is:

Add following line of code in web.config file.
 <system.webServer>
    <staticContent>
       <clientCache cacheControlCustom="public"
    cacheControlMaxAge="720:00:00" cacheControlMode="UseMaxAge" />
    </staticContent>  

  </system.webServer>


Look at the value cacheControlMaxAge="720:00:00"  it suggests the static content will be cached in users browsers for 30 days. This works perfectly and this is the easiest way to handle the cache control in asp.net web site.

Query to find Costly Queries in sql server

Today i found one script which shows top 50 costly queries. It takes those queries who consumes most CPU.

SELECT TOP 50
 [Average CPU used] = total_worker_time / qs.execution_count,
 [Total CPU used] = total_worker_time,
 [Execution count] = qs.execution_count,
 [Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2,
         (CASE WHEN qs.statement_end_offset = -1
            THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
          ELSE qs.statement_end_offset END -
qs.statement_start_offset)/2)
,[Parent Query] = qt.text
,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
ORDER BY [Average CPU used] DESC;

Script to get the number of rows in all tables

Here is the script to get the list of tables with number or rows in each table [SQL Server 2008]. This will help you when you want to know which tables are heavy. When it comes to performance issue this query is very helpful. Recently I find this query from here thanks to Jeremy Jameson. I added this query in this post as i want to make it handy.

SELECT sysobjects.Name , sysindexes.Rows 

FROM 

sysobjects 

INNER JOIN sysindexes 

ON sysobjects.id = sysindexes.id 

WHERE 

type = 'U' 

AND sysindexes.IndId < 2 

ORDER BY 

 2 desc



It will produce the result as shown below.


Table1 50000




Table2 45000




Table3 40000




Table4 10000