Microsoft KB Archive/246929

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URI Cache Flushes Performance Counter Initializes Greater than Zero

Article ID: 246929

Article Last Modified on 11/21/2006


  • Microsoft Internet Information Services 5.0

This article was previously published under Q246929


When you use the URI Cache Flushes performance counter in the Windows 2000 Performance Monitor, the counter appears to initialize at a value greater than zero.


The "URI Cache Flushes" performance counter is defined as the "URI Cache Flushes since server startup," and is reset to zero when Internet Information Services (IIS) restarts, but it increases immediately when you restart, as IIS often flushes the URI cache.

The following is a quote from the IIS 5.0 Resource Guide, which is available from Microsoft Press: Cache flushes are regulated, in part, by an internal timer. The timer activates the object-cache scavenger, which deletes expired objects. Objects are flushed from the cache if they change, or if they time out before they are reused.

To measure cache flushes, compare the number of cache flushes over time to the number of cache misses and to the rate of page faults in the Inetinfo process (as indicated by the Process\ Page Faults/sec: Inetinfo counter). It is important to observe these values over time. Like the other global IIS 5.0 counters, Cache Flushes displays an instantaneous value, not an average.


The IIS 5.0 Resource Guide is available as part of the Windows 2000 Resource Kit, which is available from Microsoft Press.

Additional query words: iis 5.0 iis5

Keywords: kbpending kbprb KB246929