"Active Requests"

Hello,
Under "Response and Load Metrics" for our Infra HTTP_SERVER (Apache on RHEL3) the total number of "Active Requests" continues to grow and is currently about 46,000. On our mid-tier this number is usually around 10.
Does anyone know what might cause this? Could a incorrectly configured firewall cause this to happen (we have a firewall between our mid and infra tier? Is this an issue that I should be converned with? I'm only asking because we are trying to track down why our database is using a ton of ram (nearly 2GB) under a pretty low load (currently less than 2k logins/day).

Sure, here are the settings I use in server.xml
When I use theese:
<application-server ... taskmanager-granularity="1000" ... />
<global-thread-pool min="10" max="10" queue="20" keepAlive="-1" />
it worked just fine - if I send to many clicks (to many users) they started to receive error 505 but the server didnt die (became unrecoverable). I let the test run fo some hour and error rate was acceptable so I will experiment further with production machine where are more CPUs.
If I reduce or increase taskmanager granularity, performance decrease. If I increase queue size on lets say 200 - its much worser, why? Any experience or magic formula for this numbers ?
If anybody has some hints if 64bit Java can be beneficial for performance (windows platform) or what settings are appropriate on multi-processor server...

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