一、确认情况:

1、mrp进程等待gap

 

 

 

 

 

2、确认日志应用情况:

 

select thread#,first_time,SEQUENCE#,block_size*blocks/1024/1024,archived,applied,statu

from v$archived_log where first_time>sysdate-10 order by 2

 

 

 

 

 

3、确认gap:

 

 

 

确认产生了gap,且在源端确认,确实的归档已经不存在,且nub没有备份。

 

基于如上结论得知归档产生了gap,备端db需要恢复

 

 

二、进行恢复

1、 备份数据文件信息:

col name for a70

set lines 200 pages 200

Select file#,name from v$datafile;

 

主库

 

 

 

备库

 

 

 

 

2、 备份standby db 当前控制文件

SQL> alter database backup controlfile to '/tmp/control.bak20200813';

 

 

3、 获取备库最后的scn,以下面最小的scn

col current_scn format 99999999999999999

select current_scn from v$database;SQL>

 

CURRENT_SCN

------------------

226206611

 

SQL> Select min(fhscn) from x$kcvfh;

 

MIN(FHSCN)

--------------------

226206612

 

 

 

4、 确认主库是否添加新的数据文件

 

set linesize 300

col name for a70

select file#,name from v$datafile where creation_change#>=226206611;SQL> SQL>

 

     FILE# NAME

---------- ----------------------------------------------------------------------

26 +DATA1DG/ORAxxxxAGR/DATAFILE/xxxxtbs.311.1048346417

 

 

 

5、主库基于scn备份,并传输到备库1节点:

 

rman target /

run{

allocate channel c1 device type disk;

allocate channel c2 device type disk;

allocate channel c3 device type disk;

allocate channel c4 device type disk;

backup as  compressed backupset INCREMENTAL FROM SCN 226206611 database format '/oracle/backup/db_inc_%U.bak';

backup current controlfile for standby format '/oracle/backup/standby_controlfile.ctl';

release channel c1;

release channel c2;

release channel c3;

release channel c4;

}

 

cd /oracle/backup

scp * 22.XX.XX.99:/nocopy/oracle_backup/backup

 

 

 

 

 

400G的主库备份出来只有不到100M

(增量全备虽然量比较小但是也要将所有数据文件都扫描一遍所以如果主库较大会占用较多的物理IO,且速度不会太快)

 

6、关闭备库2节点。

 

7、备库1节点停止mrp,更改standby_file_managementmanual,启动到no

mount状态:

 

alter database recover managed standby database cancel;

alter system set standby_file_management=manual;

shutdown immediate;

startup nomount;

 

 

8、备库1节点恢复控制文件并注册备份集:

 

rman target /

 

restore standby controlfile from '/nocopy/oracle_backup/backup/standby_controlfile.ctl';

 

alter database mount;

 

catalog start with '/nocopy/oracle_backup/backup';

 

 

 

 

 

 

 

9、使用增量备份恢复备库与主库差别的数据文件(主库未新建文件可跳过):

 

run

{

allocate channel c0 type disk;

set newname for datafile 26 to '+DATA1DG';

restore datafile 26;

release channel c0;

}

 

10、向新控制文件中注册datafile

在使用omf时,重建备库控制文件之后,记录的数据文件路径和名字会变为  MUST_RENAME_THIS_DATAFILE,此时无法使用alter database rename file 'AAAA' to 'BBBB';   无论将AAAA写成源端的数据文件路径,还是当前备库转换的数据文件路径,都不会识别会报ORA-01516。需要将备库的数据文件路径,catalog进控制文件,注册所有数据文件,并进行switch to copy操作

 

查看当前控制文件中记录的datafile信息:

 

 

 

 

(当前控制文件中显示的路径为MUST_RENAME_THIS_DATAFILE,且alert中报错)

 

向新控制文件中注册datafile:

catalog start with '+DATA1DG/ORAIPPSAGRS/DATAFILE';

 

 

 

 

 

 

进行switch:

Switch database to copy;

 

 

 

 

 

 

 

11、恢复数据库:

 

recover database noredo;

 

 

12、重新格式化所有log:

(1)查看log file

 

Select * from v$logfile order by 1;

 

 

 

 

(2)格式化所有online log(格式化时会重新创建日志文件,因此你会发现磁盘组中的日志文件变多了,原来的不需要,直接rm掉即可):

 

 

 

 

 

Alter database clear logfile group 1;

Alter database clear logfile group 2;

Alter database clear logfile group 3;

Alter database clear logfile group 4;

Alter database clear logfile group 5;

Alter database clear logfile group 6;

 

 

(3) 格式化所有standby log

 

Alter database clear logfile group 7;

Alter database clear logfile group 8;

Alter database clear logfile group 9;

Alter database clear logfile group 10;

Alter database clear logfile group 11;

Alter database clear logfile group 12;

Alter database clear logfile group 13;

Alter database clear logfile group 14;

 

(4)再次查看log file

 

 

 

 

13、启动mrp

 

alter database recover managed standby database using current logfile disconnect from session; 

 

14、检查ADG状态:

SELECT thread#,PROCESS,PID,CLIENT_PROCESS, SEQUENCE#, block#,STATUS FROM V$MANAGED_STANDBY order by 1;

 

select thread#,first_time,SEQUENCE#,block_size*blocks/1024/1024,archived,applied,status from v$archived_log where first_time>sysdate-1 order by 2

 

select * from v$dataguard_stats;

 

 

15lag日志追平以后,更改standby_file_managementauto

 

alter system set standby_file_management=AUTO;

 

 

 

16、停掉1节点mrp启动备库1节点和2节点到open,再在1节点启动mrp

 

17最后一次检查数据库和ADG同步状态:

 

select database_role,protection_mode,protection_level from v$database;

 

set linesize 300
col dest_name for a30
col database_mode for a30
select dest_id,dest_name,DATABASE_MODE,PROTECTION_MODE,recovery_mode from v$archive_dest_status;

 

SELECT thread#,PROCESS,PID,CLIENT_PROCESS, SEQUENCE#, block#,STATUS FROM V$MANAGED_STANDBY order by 1;

 

select thread#,first_time,SEQUENCE#,block_size*blocks/1024/1024,archived,applied,status from v$archived_log where first_time>sysdate-1 order by 2;

 

select * from v$dataguard_stats;

 

 

至此所有恢复工作完成