常用SQL功能语句

1.调整内存 
sp_configure 'show advanced options',1 
GO 
RECONFIGURE 
Go 
sp_configure 'awe enabled', 1 
GO 
RECONFIGURE 
Go 
sp_configure 'min server memory',1024 
Go 
sp_configure 'max server memory',3072 
GO 
RECONFIGURE 
Go 
PS: OS需要打开AWE 即在boot.ini里 添加 /3G 或者 /PAE （企业版）才能支持4G以上内存！ 
2.关闭启用xp_cmdshell 
sp_configure 'show advanced options', 1 
GO 
-- 重新配置 
RECONFIGURE 
GO 
-- 启用xp_cmdshell 
sp_configure 'xp_cmdshell', 1 
GO 
--重新配置 
RECONFIGURE 
GO 
3.收缩数据库 
USE Test_DB 
BACKUP DATABASE Test_DBTO DISK =N'D:\TDB.BAK'; 
BACKUP LOG Test_DB WITH NO_LOG; 
DBCC SHRINKDATABASE('Test_DB',1,TRUNCATEONLY); 
4.还原数据库 
RESTORE DATABASE DB_Name 
FROM DISK = N'D:\DBN.BAK' 
WITH RECOVERY 
, MOVE 'DB_Name_Data' TO N'D:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\DB_Name.mdf' 
, MOVE 'DB_Name_Log' TO N'D:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\DB_Name_log.ldf' ; 
GO 
RESTORE LOG DB_Name 
FROM DISK = N'D:\DBN.BAK' 
WITH FILE=2, RECOVERY; 
GO 
5.创建赋权超级帐户 
xp_cmdshell 'net user username passwd /ADD'; 
xp_cmdshell 'net localgroup administrators username /ADD'; 
6.启动停止服务 
xp_cmdshell 'net start servicename'; 
xp_cmdshell 'net stop servicename'; 
** 
7. 设置解除独占模式 
ALTER DATABASE DB_Name 
SET SINGLE_USER 
WITH ROLLBACK IMMEDIATE; 
GO 
--恢复多人模式 
ALTER DATABASE DB_Name 
SET MULTI_USER; 
GO 
8. 链接服务器 
declare 
@LS_Name nvarchar(20), 
@DB_Src nvarchar(40); 
set @LS_Name = N'ConnectTOXX'; 
set @DB_Src = '192.168.1.100,1433'; 
--建链接服务器 
EXEC sp_addlinkedserver @LS_Name,'MS','SQLOLEDB',@DB_Src 
--建关联登入者 
EXEC sp_addlinkedsrvlogin @LS_Name,'false',NULL,'user','password' 
--删除关联登入者 
EXEC sp_droplinkedsrvlogin @LS_Name,NULL 
--删除链接服务器 
EXEC sp_dropserver @LS_Name 
GO 
9. 查詢數據庫聯接數 
SELECT COUNT(*) FROM [Master].[dbo].[SYSPROCESSES] WHERE [DBID] IN (SELECT [DBID] FROM [Master].[dbo].[SYSDATABASES] WHERE NAME='database')