【基本优化实践】【1.3】最大内存参数限制

开启参数优化 

exec sp_configure 'show advanced options', 1 reconfigure;
exec sp_configure 'xp_cmdshell', 1 reconfigure;
exec sp_configure 'Ad Hoc Distributed Queries', 1 reconfigure;
exec sp_configure 'show advanced options', 0 reconfigure;
GO

/* 规则
    如果16G及以下，给2G给操作系统
    如果32G及以下，给4G给操作系统
    如果32G以上（不含32G），给内存的10%给系统
*/

use master
go

declare @physical_memory int
declare  @TempTable table
(
[Index] VARCHAR(2000) ,
[Name] VARCHAR(2000) ,
[Internal_Value] VARCHAR(2000) ,
[Character_Value] VARCHAR(2000)
);
INSERT INTO @TempTable
EXEC xp_msver;
SELECT @physical_memory=cast(Internal_Value as int)
FROM @TempTable
WHERE Name = 'PhysicalMemory';
print @physical_memory
if @physical_memory<=1024*16
    set @physical_memory=@physical_memory-1024*2
else if @physical_memory<=1024*32
        set @physical_memory=@physical_memory-1024*4
    else
        set @physical_memory=@physical_memory*0.9

print @physical_memory
EXEC sys.sp_configure N'max server memory (MB)',@physical_memory
GO
RECONFIGURE WITH OVERRIDE
GO