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Home > Support > Additional Resources > Tip of the Month

Tip of the Month

March 2000

Application response time analysis

Application response time analysis often involves more than just protocol analysis. If the network is error free, has plenty of bandwidth, and has low latency, check the server response time on the server's local segment. If, for example, you see an SQL server immediately send a TCP ACK packet in response to a client's SQL packet (such as a Sybase/Microsoft TDS packet), but the server's response TDS packet is several seconds later, the problem lies within the SQL server.

Ensure that your analyzer and server clocks are set to the same time and log server utilization and SQL performance statistics using a utility such as NT's performance monitor (perfmon).

Then, whenever you see a delayed TDS response packet in your analyzer you can correlate the time to the logged statistics such as CPU utilization, disk I/O, SQL cache hits, internal SQL transactions per second, etc., to help identify the bottleneck.

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Tip of the Month
Time to ‘Select’
This month I’m going to address the need of being able to actively select certain packets from an active capture. This occurs when you have an active capture running, which you cannot stop for whatever reason, but you wish to apply a filter to it.
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