Hello,
Please check Forums Threads with similar Issue.
SEPM Server pegged at 100% / SQL 2008
https://www-secure.symantec.com/connect/forums/sepm-server-pegged-100-sql-2008
Again, after Looking into this a little bit more and here is what I found.
In general this issue is not cause specifically by the Symantec Endpoint Protection Manager or any of it's software. It is usual for a MS SQL server to take up as much physical RAM as 4 GB +. The specific process that you will see utilize a good chunk of memory is sqlservr.exe.
The reason that the SQL server does this is for faster access. In fact the SQL memory manager will try to cache as much data in memory as possible so it can access it faser, and it will take more of the available memory on servers with a large amount of unused RAM.
To resolve this you should contact Microsoft for instructions on how to configure the "Max Server Memory" setting in Microsoft SQL Server.
Setting Server Configuration Options
http://msdn.microsoft.com/en-us/library/ms189631.aspx