How to find out how many "maximum server memory" should I configure.

Hello guys
I'm asking myself what i should configure in "maximum server memory".
Default is: 2147483647
Is there a way to find out whats the best for my Database? 
Cause I really dont understand the "DBCC MEMORYSTATUS" output :(
Or is it allways "my server has 32GB of ram, so i configure max server memory to 28GB so the OS has 4GB to use"
I know its a little bit a stupid question...
Thanks and regards, Dominic

This is NOT at all really a stupid question!! A very valid question. But its very difficult to answer your question :)
There is no strict value for it. But you can come to a close value by understanding what are you running on your machine. But for 32 GB Total Memory, 26-28 would be a good capping and later you can do the adjustment as required.
BTB, important question Are you facing any external memory pressure on your SQL Server and Whats your SQL Server Version(there are some changes for versions)?
Links that would help you:
http://www.sqlservercentral.com/blogs/glennberry/2009/10/29/suggested-max-memory-settings-for-sql-server-2005_2F00_2008/
http://mssqlwiki.com/sqlwiki/sql-performance/basics-of-sql-server-memory-architecture/
http://sportstoday.us/technology/sql-server-2012---optimizing-sql-server-memory-configuration---min-and-max-server-memory,-optimize-for-ad-hoc-workloads-.aspx

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