How to know the memory used by db

Hi,
Is there any transaction which tells me the exact memory used by Db (MS SQL)?
If not is there any utilities I can go in and find out the Db memory used?
I remember seeing the screen which says:
Server
Memory Available MBytes = xxxxx
How can i get this? I dont know how to get to it, but i know its possible.
Thanks

Hi,
Actually I suppose that, we cant definitely say that how much memory the database is using because, the frequently used tables are always buffered and less frequently used table are not buffered or partially buffered.
However when a table is accessed, it brought to the buffer and then only seen in the GUI. Suppose consider an instance, some tables are accessed once a month or once a quarter, during that time it buffer used by the total number of tables will be more. than the normal instances.
Regards
Sudha

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