1. 创建备份设备步骤3步骤42. 数据库完整备份、差异备份和日志备份步骤2步骤53.数据库还原和日志还原实践练习USE masterGOEXEC sp_addumpdevice disk, bak1D:bak1.bak步骤6步骤7BACKUP DATABASE TeachingDB TO bak1 WITH DIFFERENTIAL,NAME=TeachingDB-差异数据库备份步骤8ALTER DATABASE TeachingDB SET RECOVERY FULLBACKUP LOG TeachingDB TO DISK=baklog.bak WITH NAME=BlueSkyDB-事务日志备份,INIT步骤9