Exchange 2010 Data base cache percent hit

Hi...

I have exchange 2010 server with 24 GB RAM and 10 data bases with around 120 mailboxes each.

We applied monitoring on Exchange perfmon counters.

Frequently i am receiving "DatabaseCachePercentHit:Critical : DatabaseCachePercentHit = 0"

Is it really critical if DatabaseCachePercentHit = 0 ?

I am recieving the same error on my edge transport server also.

Till what value i can bear this DatabaseCachePercentHit?

Any Ideas? or can i ignore if the value is 0.

Also please share me the link of perfmon counter default values for exchange 2010 that i can ignore.

Thanks in advance.

Mallikarjuna YH, Windows / Exchange