Information:

Environment

  • Dynatrace Portal
Symptoms

I reviewed the waterfall information for a recent test and not all objects include a DNS lookup time. Does the DNS lookup only run occasionally? Why is the DNS lookup missing for some objects?

Solution

The objects displayed in a waterfall chart that have no DNS Lookup times are objects that were downloaded during a previously established connection.

DNS Lookup refers to the time it takes to translate the host name (e.g., www.dynatrace.com) into an IP address (e.g., 63.251.134.20).

The DNS Lookup occurs for every connection that the Agent makes when executing a test script. Several objects can be downloaded from a server without making additional connections and executing new DNS Lookups. Downloading several objects through one connection lowers the overall response time for downloading the page.

 

 

 

 

 

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