Windowing Extensions) that allows up to 64GB of RAM to be addressed.
Assuming you configure the appropriate hardware and
software, AWE support is not turned automatically on, you have to do
this step manually. To turn AWE support on, you must change the “awe
enabled” advanced SQL Server 2000 or 2005 option from 0 to 1. For
example, to turn on AWE support:
SP_CONFIGURE ‘show advanced options’, 1
RECONFIGURE
GO
SP_CONFIGURE ‘awe enabled’, 1
RECONFIGURE
GO
AWE memory cannot be dynamically managed, like memory
is normally managed in SQL Server. This means that SQL Server will
automatically grab all the RAM it can when it starts (except for about
128MB, which is reserved for the operating system), but it will not
release any of this RAM until SQL Server is turned off. If your server
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is a dedicated SQL Server, then this might be OK. But if you are running
other software on the server, or are running multiple instances of SQL
Server, then you must specify the maximum amount of RAM that SQL Server
can grab when it is started. This can be done using the “max server
memory” configuration option. If you change this setting, you will have
to stop and start the mssqlserver service in order for the new setting
to take affect.
To set the maximum amount of memory that AWE memory
can access, you can use SQL Server’s “max server memory” configuration
option. For example:
SP_CONFIGURE ‘max server memory’, 4096
RECONFIGURE
GO
In the above example, we are telling SQL Server to
only use 4GB of RAM, leaving any other RAM available in the server free
for other applications.
While multiple instances of SQL Server can be used
with AWE memory, you probably won’t want to, as it can be a headache to
manage. In fact, running multiple instances of SQL Server in AWE memory
defeats the purpose of more RAM in the first place. Generally, your goal
of using AWE memory should be to support a single, very large instance
of SQL Server, not lots of smaller instances running on a single server.
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