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 ' user username passwd /ADD';
xp_cmdshell ' localgroup administrators username /ADD';
6.启动停止服务
xp_cmdshell ' start servicename';
xp_cmdshell ' s 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')