oracle热备份

1：热备份：

 SHUTDOWN IMMEDIATE;
 STARTUP MOUNT;
 alter database archivelog;
 --ALTER SYSTEM SET LOG_ARCHIVE_START=TRUE SCOPE=SPFILE;

 ALTER SYSTEM RESET log_archive_start SCOPE=SPFILE SID='MyOrcl';
 ALTER DATABASE OPEN;
 ALTER TABLESPACE USERS BEGIN BACKUP;
 HOST COPY G:\app\zhaobin\oradata\MyOrcl\*.dbf G:\BAK;
 ALTER TABLESPACE USERS END BACKUP;
 ALTER SYSTEM SWITCH LOGFILE;

2：热备份恢复：

 ALTER DATABASE DATAFILE 4 OFFLINE DROP;//让这个出故障的文件暂时先脱机
 ALTER DATABASE OPEN;//打开数据库
 HOST COPY G:\BAK\*.dbf  G:\app\zhaobin\oradata\MyOrcl\//将前面备份的文件拷贝到系统目录中
 RECOVER DATAFILE 6;//这一步，偶尔会出错，无法正确执行，而且无法正常关闭数据库，请如此这般

 操作，SHUTDOWN ABORT; STARTUP;
 ALTER DATABASE DATAFILE 6 ONLINE;