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copied!<p>Deciding what analysis to do depends on what decisions you're trying to make based on that analysis. For example, I currently monitor logs for exceptions reported by our application (all exceptions in the client application are logged with the server) to decide what should be high priority client bugs to investigate. I also use log searching software to monitor for any Exceptions reported by our server software which may need more immediate investigation. On top of the logs generated by everything anyway, I also use some monitoring software to track usage of our web server and database server which records usage stats etc. in a database. The final aim of this is to predict future usage levels and purchase more hardware as appropriate to keep up with demand.</p> <p>Two (free) tools I've been using are:</p> <p><a href="http://www.hyperic.com/" rel="nofollow noreferrer">Hyperic</a> for monitoring, it's pretty easy to set up and might be able to start logging a lot of data you may be interested in, ie requests per second on a web server. </p> <p><a href="http://www.splunk.com/" rel="nofollow noreferrer">Splunk</a> for searching log files, it's very easy to get set up and work with and gives you excellent searching capabilities over your log files. If you're working with log files right now and haven't tried out splunk I definitely recommend it. I have noticed a couple of moments of 100% cpu whilst using it on our main production server so stopped running it on that machine recently, just a word of warning.</p> <p>Not sure what your aim is with this analysis, mine has been very much about looking for any errors I should know about, and planning for future capacity needs. If you're interested in the latter I'd also recommend <a href="http://astore.amazon.com/possiboutpos-20/detail/0596518579" rel="nofollow noreferrer">The Art of Capacity Planning</a>.</p>

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