What's the average size memory RAM needed for SQL Server 2008 R2

Hi Experts,
 What's the average size memory RAM needed for SQL Server 2008 R2?

Thanks in advance,
mrotor
mainrotorAsked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
What's your largest database size?
What's going to be installed in the server?
Are you talking about a Stand Alone or a Cluster solution?
How many instances of SQL Server?
Which version and edition of Windows Server?
Ryan McCauleyEnterprise Analytics ManagerCommented:
The easy answer is "as much as you can give it, as RAM is generally cheaper than performance problems", but the longer answer is that "it depends and is complicated". It depends on how many users you'll have at a time, how large your databases are, how fast your storage is (slower storage means that reads from disk are more time-consuming, so everything you can cache helps), and a number of other factors.

Brent Ozar's site has a pretty solid write-up that explains what you'll need to consider as you size up RAM requirements, and it's especially helpful if you can measure performance and behavior of your application on a server that already exists (but you can make some estimates if you don't have a test server):

http://www.brentozar.com/archive/2014/05/much-memory-sql-server-need/

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Microsoft SQL Server 2008

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