Tracking Visits to my Web Site

A) The current web site I am working on I created using Microsoft Visual Interdev

B) the problem > I track the number of visits to the web site in a text file.  I use the Session_OnStart routine in global.asa via VBSCRIPT.

The process is to 1) load the text file in to get the count, 2) close that file, 3) re-create the file writing the new total of visits.

Finally, my question> What happens if two people access the file at the same time?  How can I protect from any possible file problems?
MLHAMMELAsked:
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icdCommented:
If two people access at the 'same time' then the worst that can happen is that one visit will not be counted. Imagine the counter having the value 100

Visitor A opens the file, reads 100
Visitor B opens the file, reads 100
Visitor A writes the value 101
Visitor B writes the value 101

With more complex data manipulations it can cause inconsitancies between dependent data which can cause your database to become corrupted.

The normal way of locking in perl is to use the 'flock' command. I have not used VBSCRIPT but there is likely to be a similar method in that language. Do a search for 'lock'. To do an update you first obtain the lock, make the read, increment it, write the file back again and then free the lock. Another process wanting to do an update will have to wait for the lock to become available.

On my own web site I don't bother with file locking in this type of case since the data is fairly inaccurate anyway. So long as it does not corrupt the data I don't mind.

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MLHAMMELAuthor Commented:
I did some research and you are right about the LOCK command.  I am using Application.Lock, Application.Unlock

Good anwser.

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