Re: Rate of change in an Exchange database

Unless you're doing something extremely unusual, like delivery to PST or all
POP clients, that figure sounds very suspect. I typically see more like
3-5% at the item level. It's important to distinguish that from the block
level however. I have seen aggressive Online Maintenance (online defrag
represents the majority of changes) schedules cause block level changes on
the order of 40%. Do be aware that MS recommends that Online Defrag
complete once every two weeks. If you schedule less agressively to meet
this target, then the block level changes are on the order of the item level
changes.

John


<h_henry@xxxxxxxxx> wrote in message
news:1172677151.480155.33320@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
We recently met with some consultants to discuss up and coming
Exchange design work. I was very interested to hear that within a
database (in a normal working day) 80% of that file will change in a
day, even if there is little actual mail/change caused by user
activity.

Can anyone clarify this or point me maybe to an official document?
Many thanks, H.



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