SQLServer using too much memory - memory-management

Question

I have installed on my desktop machine (with windows 7) SQLServer 2008 R2 Express.
I have only one local server running (./SQLEXPRESS) but the sqlserver process is taking ALL the RAM possible.
With an machine with 3GB of RAM the things starts to get slow, so I limited the maximun amount of RAM in the server, and now, constantly the SQLServer give some error messages that the memory is not enought. It's using 1GB of RAM with only one LOCAL server with 2 databases completely empty, how 1GB of RAM isn't enought ?
When the process start it's using an really acceptable amount of memory (around 80MB) but it's keep increasing until it reaches the maximun defined and start to complain about having not enought memory available. In that point I have to restart the server to use it again.
I have read about an hotfix to solve one of the errors I got from sqlserver:
There is insufficient system memory in resource pool 'internal' to run this query
But it's already installed on my sqlserver.
Why it's using so much memory?

Answer 1

You can try configuring the 'max server memory' configuration option:
For additional details check:
http://technet.microsoft.com/en-us/library/ms178067(v=sql.105).aspx
http://support.microsoft.com/kb/321363
http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/df51cd87-68ce-439a-87fa-d5e5cd93ab31

Answer 2

I had the problem like this.
You can increase the cache size of DB.
On MSSQL server properties, choose memory, there have "maximum server memory (in MB)" You can increase this cell.
Or same thing with query:
EXEC sp_configure'Show Advanced Options',1;
GO
RECONFIGURE;
GO
EXEC sp_configure'max server memory (MB)',3500;
GO
RECONFIGURE;
GO