Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Performance Tuning Guide

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#### Keep Alive Query Mean Time

Keep Alive Query Mean Time specifies the interval between polling keep alive connections. If this parameter has a value of n milliseconds, the response time seen by a client that has requested a keep alive connection will have an overhead between 0 and n milliseconds.

The default value of this parameter is one millisecond, which works well for an expected concurrent load of less than 300 keep alive connections. The default value can severely reduce the scalability with higher concurrent loads. For applications with higher connection loads, increase the default value.

Set this parameter with `asadmin` or in Admin Console HTTP Service page, by choosing Add Property and specifying:

- Name: `keep-alive-query-mean-time`

- Value: number of milliseconds

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