the database buffer cache has been written out

i have the following warning in my mailbox server

A significant portion of the database buffer cache has been written out to the system paging file. This may result in severe performance degradation.  Alert Description
   
Source:  ESE - MBX2 (Common) - Default-First-Site-Name  Information Store (3268) A significant portion of the database buffer cache has been written out to the system paging file. This may result in severe performance degradation.


Topology
2 network load balanced hub cas server with exchange server 2010 service pack 1
2 clustered mailbox server with exchange server 2010 service pack 1
2 domain controllers in the same site

all that on virtual machine on VMware

Action:
I found a link that advised me to know At that point in time another process started consuming a lot of memory

how to know the history of process that took place in specif point of time
put into consideration that I read events that took place before  this warning for 1 minite

like this

Starting from 3/14/2012 5:39:19 AM service <Unknown> has performed this activity on the server:
RPC Operations: 2484.
Database Pages Read: 0 (of which 0 pages preread).
Database Pages Updated: 0 (of which 0 pages reupdated).
Database Log Records Generated: 0.
Database Log Records Bytes Generated: 0.
Time in Server: 157 ms.
Time in User Mode: 157 ms.
Time in Kernel Mode: 0 ms.
omzeyadAsked:
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Andrew DavisManagerCommented:
have a look at http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26369498.html and let us know if anything there fails to assist.

cheers
Andrew
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Windows Server 2008

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