--查看當前的存放位置 
select database_id,name,physical_name AS CurrentLocation,state_desc,size from sys.master_files  
where database_id=db_id(N'數(shù)據(jù)庫名'); 
 
--修改文件的存放位置下次啟動生效 
--testDb為數(shù)據(jù)庫名， 
alter database 數(shù)據(jù)庫名 modify file ( name = 文件名(不包含后綴), filename = '文件存儲路徑'); 
alter database 數(shù)據(jù)庫名 modify file ( name = 文件名(不包含后綴), filename = '文件存儲路徑'); 
eg. 
  alter database testDb modify file ( name = testDb, filename = 'G:\SQL_DATA\testDb\testDb.mdf'); 
  alter database testDb modify file ( name = testDb_log, filename = 'G:\SQL_DATA\testDb\testdb_log.ldf'); 
 
--修改默認的數(shù)據(jù)庫文件存放位置（即時生效） 
EXEC xp_instance_regwrite  
@rootkey='HKEY_LOCAL_MACHINE',  
@key='Software\Microsoft\MSSQLServer\MSSQLServer',  
@value_name='DefaultData',  
@type=REG_SZ,  
@value='E:\MSSQL_MDF\data'  
GO  
--修改默認的日志文件存放位置<span style="font-family: Arial, Helvetica, sans-serif;">（即時生效）</span> 
EXEC master..xp_instance_regwrite  
@rootkey='HKEY_LOCAL_MACHINE',  
@key='Software\Microsoft\MSSQLServer\MSSQLServer',  
@value_name='DefaultLog',  
@type=REG_SZ,  
@value='E:\MSSQL_MDF\log'  
GO