无备份恢复各种场景的处理

1.恢复密码文件

orapwd file=$ORACLE_HOME/dbs/orapwocp password=oracle force=y ignorecase=y;

--注：普通用户的密码大小写是否区分由初始参数sec_case_sensitive_logon,不归密码文件处理

2.恢复参数文件

找alert_sid.log日志

3.无备份的控制文件

***场景1：在线日志无损的情况下的重建

rm -rf control*

shutdown abort;

startup nomount;

CREATE CONTROLFILE REUSE DATABASE "BXDB" NORESETLOGS...

reocver database;

alter database open;

ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/bxdb/temp01.dbf' reuse;

***场景2：在线日志损坏的情况下的重建

shutdown immediate; --注这里要正常关闭数据库，否则会要求system做恢复???

rm -rf control*

rm -rf redo*

startup nomount;

CREATE CONTROLFILE REUSE DATABASE "BXDB" RESETLOGS...

recover database until cancel using BACKUP CONTROLFILE;--RMAN>recover database until sequence 2;

alter database open resetlogs;

ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/bxdb/temp01.dbf' reuse;

***场景3：具有只读数据文件情况下的重建

startup nomount;

CREATE CONTROLFILE REUSE DATABASE "BXDB" NORESETLOGS...

recover database; --recover database using backup controlfile;

alter database open; --alter database open resetlogs;

alter database rename file '/u01/app/oracle/product/11g/dbs/MISSING00005' to '/u01/app/oracle/oradata/bxdb/tp2.dbf';

alter tablespace tp12 online; --不能设数据文件在线(alter database datafile 7;)

ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/ocp/temp01.dbf' reuse;

***场景4：使用控制文件快照恢复

cp /u01/app/oracle/product/11g/dbs/snapcf_ocp.f /u01/app/oracle/oradata/ocp/control01.ctl

cp /u01/app/oracle/product/11g/dbs/snapcf_ocp.f /u01/app/oracle/oradata/ocp/control02.ctl

cp /u01/app/oracle/product/11g/dbs/snapcf_ocp.f /u01/app/oracle/oradata/ocp/control03.ctl

startup mount;

recover database using backup controlfile; --RMAN>recover database;

alter database open resetlogs;

4.恢复数据文件

rm -rf tp5.dbf;

alter database datafile 8 offline;

alter database create datafile '/u01/app/oracle/oradata/ocp/tp12.dbf';

select * from t20; ---报错没找到文件

recover datafile 8;

alter database datafile 8 online;

5.恢复临时文件

alter tablesapce temp add tempfile '/u01/app/oracle/oradata/oca/temp02.dbf' size 20M autoextend on;

alter tablesapce temp drop tempfile '/u01/app/oracle/oradata/oca/temp01.dbf';

6.恢复在线重做日志

***场景1：每个日志组有两个在线日志成员，1号组是其中一个redo01B.log损坏了

alter database drop logfile member '/u01/app/oracle/oradata/oca/redo01B.log';

alter database add logfile member '/u01/app/oracle/oradata/oca/redo01B.log' to group 1;

***场景2：每个日志组有两个在线日志成员，1号组的所有日志（redo01A.log和redo01B.log）损坏了

alter database clear logfile group 1;

alter database clear unarchived logfile group 1;

***场景3：所有日志组全部损坏了

rm -rf redo*

shutdown immediate;

startup mount;

recover database until cancel;

alter database open resetlogs;

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