The most valuable friend to an IT Professional or Developer who uses IIS is a little-bitty check-mark field that is not enabled by default. This field is the red-headed stepchild of logging but one that plays so many friendly tunes for you to determine what requests are taking a long time. The relative thing is “long time” in most environments as one’s long time might be 2 seconds while another’s is 10.
In either event, don’t lose site of how to do yourself right when the time comes to do some log “mining.” Enable the time-taken field for W3C logging (if you are using this type).
User Interface:
1). Open IIS Manager (Start – Run – Inetmgr)
2). Right-click on the Web Sites tab (IIS 6 only — IIS 5 customers right-click on Server)
3). Choose Properties
4). On the General tab, select the Properties for Logging
5). On the advanced tab, scroll down and check “Time-Taken”
6). Click Ok, Ok
7). For the application pool where the code is being executed, right-click and select iisapp.vbs (SP 1 customers can use iisapp.vbs and view the application pools. Then, use iisapp /p 1234 (for PID) /r (for recycle)
Command-Line:
adsutil.vbs set w3svc/LogExtFileTimeTaken 1
NOTE: This sets it globally. It will be inherited down where appropriate to each site. If you prefer to enable only on one site, then use this syntax:
adsutil.vbs set w3svc/{site#}/root/LogExtFileTimeTaken 1
For a simple Log Parser query to find the top URI’s in time-taken (i.e. slow) then use this:
Logparser “select * from <filename> where time-taken > 10000 OrderBy cs-uri-stem”
Happy troubleshooting,
~Chris
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