RMAN命令简解

RMAN命令简解 

1 列出场景号  
RMAN>list incarnation;
  
2 列出备份
  
 2.1概述可用的备份    RMAN>list backup summary;
               B 表示 backup
               F 表示 FULL
               A 表示 archive log
               0 1 表示 incremental backup
               S 说明备份状态 (A AVAILABLE   X EXPIRED )
  
  2.2按备份类型列出备份  RMAN>list backup by file;
               按照 数据文件备份,归档日志备份,控制文件备份,服务器参数文件备份 列出
  
  2.3列出详细备份     RMAN>list backup;
  
  2.4列出过期备份     RMAN>list expired backup;
  
  2.5列出表空间和数据文件备份
              list backup of tablespace 和list backup of datafile 输出和list backup 相似
               如:list backup of tablespace user_tbs;
                 list backup of datafile 3;
  
  2.6列出归档日志备份   RMAN>list archivelog all;      简要信息
    RMAN>list backup of archivelog all; 详细信息
  
  2.7列出控制文件和服务器参数文件
               RMAN>list backup of controlfile;
               RMAN>list backup of spfile;
  
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  RMAN 的 report命令
  
  1. 报告最近没有被备份的数据文件
    RMAN>report need backup days=3;
    
  2. 报告备份冗余或恢复窗口
    RMAN>report need backup redundancy=2;
    RMAN>report need backup recovery window of 2 days;
    
  3. 报告数据文件的不可恢复操作
    RMAN>report unrecoverable;
  
  4. 报告数据库模式
    RMAN>report schema;
    
  5. 报告丢弃的备份
    如果使用了保存策略,备份会标记为丢弃状态  RMAN>report obsolete; 删除丢弃状态备份RMAN>delete obsolete;
  
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  RMAN的crosscheck 命令
  
  1 备份集有两种状态A(Available,RMAN认为该项存在于备份介质上)X(Expired,备份存在于控制文件或恢复目录中,但是并没有物理存在于备份介质上)
   
  2 crosscheck 的目的是检查RMAN 的目录以及物理文件,如果物理文件不存在于介质上,将标记为Expired。如果物理文件存在,将维持Available。如果原先标记为Expired 的备份集再次存在于备份介质上(如恢复了损坏的磁盘驱动器后),crosscheck将把状态重新从Expired标记回Available。
  
  3 crosscheck 输出分两部分。第一部分列出确定存在于备份介质上的所有备份集片,第二部分列出不存在于备份介质上的备份集片,并将其标记为Expired。当设置备份保存策略后,一个备份过期,crosscheck之后标记为丢弃的备份状态依旧为availabel,要删除丢弃备份delete obsolete。
  
  4 示例:
   crosscheck backup
   crosscheck backup of datafile 1;
   crosscheck backup of tablespace users;
   crosscheck backup of controfile;
   crosscheck backup of controlfile;
   crosscheck backup tag='SAT_BACKUP';
   crosscheck backup completed after 'sysdate - 2'
   crosscheck backup completed between 'sysdate - 5' and 'sysdate -2 '
   crosscheck backup device type sbt;
   crosscheck archivelog all;
   crosscheck archivelog like '%ARC00012.001'
   crosscheck archivelog from sequence 12;
   crosscheck archivelog until sequence 522;
  
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  RMAN 的validate 命令
  
  1 validate 命令验证备份集片是否能够被还原
  
  2 list backup summary; 得到了备份集得主键ID如40,然后validate backupset 40;
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  RMAN 的备份保存策略以及change ,delete命令
  
  0.带delete参数的change 命令删除备份集,从备份介质,并且从控制文件和恢复目录中删除。
   change backupset 117,118 delete;
   change backuppiece 1304 delete;
   change archivelog until logseq =544 delete;
  
  1.两类策略:恢复窗口备份保存策略(recovery windows backup retension policy) 基于时间
        备份冗余备份保存策略(backup redundancy backup retension policy) 基于备份的数量
  
   两类策略互相排斥
   
  2.即使使用了备份保存策略,备份到期并不删除,只是在RMAN目录中标记为丢弃,看到的状态依旧为available;
   要查看标记为丢弃的备份 report obsolete,只有使用delete obsolete才真正物理删除。
  
  3.configure retension policy to recovery window of 7 days;
   configure retension policy to redundancy 3;
   显示结果 show all;
   
  4.查看到期丢弃的备份时,可能需要手工保存一些备份 ,可以使用change 命令带keep 参数,使用这个命令后,那些被修改的备份将被认为是个long-term backup,不在受保存策略影响也就是说delete obsolete 也不删除。
  
  5.要使备份时候不受保存策略影响 ,使用带keep参数的backup 命令
   backup database keep forever;
   backup database keep 5 days;
  
  6.change 命令功能
  
    可以修改备份为永久保存并将以及该备份的相关的日志保存下来,保证总能将备份恢复到当前时间点
    change backupset 31 keep forever logs;
    可以设置备份丢弃的新日期 ,将备份在多保存7 天,7 天后将删除
    change backupset 32 keep until time 'sysdata 7' logs;
  
  7.change 可以将备份集设置为unavailable
    change backupset 33 unavailable;
    标记为unavailable状态的备份集并不参与crosscheck;
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  恢复目录的记录删除
  
  1. $ORACLE_HOME/rdbms/admin/prgrmanc.sql 脚本定期删除恢复目录中具有DELETED状态的记录
  
  2. 要删除旧的对应物记录incarnation.必须从DBINC 表中删除这些对应物,使用RC_DATABASE_INCARNATION 视图来确定要删除的对应物。记录要删除的每个对应物的DBINC_KEY
    随后启动SQL*Plus,执行delete from dbinc where dbinc_key=2;
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  手工同步恢复目录
  
  resync catalog;
  
  Oracle同步恢复目录的时候,首先创建快照控制文件,然后比较这个文件和恢复目录,完成后,Oracle 更新恢复目录,使恢复目录和控制文件同步
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  在RMAN 中存储脚本
  
  1,连接到目标数据库和恢复目录
    rman target / catalog rman/rman@rman9i
    
  2,创建脚本
    RMAN>create script my_bk_script
    2>{backup database plus archivelog;}
     create script my_bk_script
     
  3,打印脚本
   RMAN>print script my_bk_script;
   printing stored scipt:my_bk_script
   {backup database plus archivelog;}
   
  4,运行这个脚本,备份目标数据库
   RMAN>run {execute scipt my_bk_script;}
   
  5 删除脚本
   RMAN>delete script my_bk_script;
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  archivelog模式下的完全恢复
  
  step1:set oracle_sid=recover
      rman target rman_backup/password
      configure controlfile autobackup on;
      
  step2:backup database plus archivelog delete input;
  
  step3:shutdown immediate;
  
  step4:重命名所有的数据文件和控制文件,不重命名联机重做日志。
  
  step5: startup nomount;
      set DBID=****
      restore controlfile from autobackup;
      alter database mount;
      
  step6: restore database;
      recover database;
      alter database open resetlogs;
  
  表空间恢复
  
  sql"alter tablespace users offline";
  sql"alter tablespace tools offline";
  restore tablespace users,tools;
  recover tablespace users,tools;
  sql"alter tablespace users online";
  sql"alter tablespace tools online";
  
  数据文件恢复
  
  sql"alter database datafile 3 offline";
  sql"alter database datafile 'd:oracleoradatausers01.dbf' offline";
  restore datafile 3
  restore datafile 'd:oracleoradatausers01.dbf';
  recover datafile 3
  recover datafile 'd:oracleoradatausers01.dbf';
  sql"alter database datafile 3 online";
  sql"alter database datafile 'd:oracleoradatausers01.dbf'online";
  
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  切换当前的incarnation 回到resetlogs 前RESET DATABASE TO INCARNATION inc_key
  
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  RMAN 高级恢复
  
  1 基于时间点的恢复
  run
  {
  set until time "to_date('07/01/02 15:00:00','mm/dd/yy hh24:mi:ss')"'
  restore database;
  recover database;
  alter database open resetlogs;
  }
  
  2 基于SCN 的恢复
  startup mount;
  restore database UNTIL SCN 10000;
  recover database UNTIL SCN 10000;
  alter database open resetlogs;
  
  3 基于日志序列的恢复
  startup mount;
  restore database UNTIL SEQUENCE 100 thread 1;
  recover database UNTIL SEQUENCE 100 thread 1;
  alter database open resetlogs;

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