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这篇文章给大家介绍DG归档丢失场景下如何重新同步physical standby，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
一.场景描述
由于归档日志丢失，导致物理备库MRP进程无法与主库同步。
SQL> select thread#, max(sequence#) "Last Standby Seq Received"
2 from v$archived_log val, v$database vdb
3 where val.resetlogs_change# = vdb.resetlogs_change#
4 group by thread# order by 1;
THREAD# Last Standby Seq Received
---------- -------------------------
1 1121
2 1143
SQL> select thread#, max(sequence#) "Last Standby Seq Applied"
2 from v$archived_log val, v$database vdb
3 where val.resetlogs_change# = vdb.resetlogs_change#
4 and val.applied in ('YES','IN-MEMORY')
5 group by thread# order by 1;
THREAD# Last Standby Seq Applied
---------- ------------------------
1 882
2 853
二.使用主库增量备份进行备库恢复
1.查询备库SCN
SQL> SELECT CURRENT_SCN FROM V$DATABASE;
SQL> select min(fhscn) from x$kcvfh; --推荐
MIN(FHSCN)
----------------------------------------
41888422
2.只读表空间处理
如果存在只读表空间，则需要在主库执行下面命令:
SQL> alter tablespace xxx read write ;
SQL> alter tablespace xxx read only ;
3.根据备库SCN，在主库进行增量备份
RMAN> BACKUP INCREMENTAL FROM SCN 41888422 DATABASE FORMAT '/tmp/ForStandby_%U' tag 'FORSTANDBY';
Starting backup at 2018-03-30 15:38:47
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=39 instance=racdb12c1 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00006 name=+DGDATA1/RACDB12C/DATAFILE/ees_dat01.dbf
input datafile file number=00007 name=+DGDATA2/RACDB12C/DATAFILE/ees_idx01.dbf
input datafile file number=00002 name=+DGSYSTEM/RACDB12C/DATAFILE/sysaux.272.960743041
input datafile file number=00001 name=+DGSYSTEM/RACDB12C/DATAFILE/system.271.960743017
input datafile file number=00008 name=+DGDATA1/racdb12c/datafile/ees_idx02.dbf
input datafile file number=00009 name=+DGDATA1/racdb12c/datafile/ees_idx03.dbf
input datafile file number=00003 name=+DGSYSTEM/RACDB12C/DATAFILE/undotbs1.273.960743055
input datafile file number=00004 name=+DGSYSTEM/RACDB12C/DATAFILE/undotbs2.275.960743081
input datafile file number=00005 name=+DGSYSTEM/RACDB12C/DATAFILE/users.276.960743083
channel ORA_DISK_1: starting piece 1 at 2018-03-30 15:38:52
channel ORA_DISK_1: finished piece 1 at 2018-03-30 15:45:50
piece handle=/tmp/ForStandby_5fsv3e4b_1_1 tag=FORSTANDBY comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:06:58
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
channel ORA_DISK_1: starting piece 1 at 2018-03-30 15:45:58
channel ORA_DISK_1: finished piece 1 at 2018-03-30 15:46:05
piece handle=/tmp/ForStandby_5gsv3ehf_1_1 tag=FORSTANDBY comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
Finished backup at 2018-03-30 15:46:05
4.将备份文件copy至备库并注册
scp root@rac1:/tmp/ForStandby_5fsv3e4b_1_1 /tmp
scp root@rac1:/tmp/ForStandby_5gsv3ehf_1_1 /tmp
catalog backuppiece '/tmp/ForStandby_5fsv3e4b_1_1';
catalog backuppiece '/tmp/ForStandby_5gsv3ehf_1_1';
-确认
list backup
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
12 Incr 1.96G DISK 00:06:55 2018-03-30 15:45:46
BP Key: 12 Status: AVAILABLE Compressed: NO Tag: FORSTANDBY
Piece Name: /tmp/ForStandby_5fsv3e4b_1_1
List of Datafiles in backup set 12
File LV Type Ckp SCN Ckp Time Abs Fuz SCN Sparse Name
---- -- ---- ---------- ------------------- ----------- ------ ----
1 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafilesys/datafile/system.271.960743017
2 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafilesys/datafile/sysaux.272.960743041
3 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafilesys/datafile/undotbs1.273.960743055
4 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafilesys/datafile/undotbs2.275.960743081
5 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafilesys/datafile/users.276.960743083
6 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafileuser/datafile/ees_dat01.dbf
7 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafileuser/datafile/ees_idx01.dbf
8 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafileuser/datafile/ees_idx02.dbf
9 Incr 52145113 2018-03-30 15:38:52 NO /oradata/racdb12cdg/datafileuser/datafile/ees_idx03.dbf
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
13 Incr 46.50M DISK 00:00:08 2018-03-30 15:45:59
BP Key: 13 Status: AVAILABLE Compressed: NO Tag: FORSTANDBY
Piece Name: /tmp/ForStandby_5gsv3ehf_1_1
Control File Included: Ckp SCN: 52146933 Ckp time: 2018-03-30 15:45:51
5.恢复备库controlfile
(1).启动备库至nomount状态
startup nomount
(2).备份备库控制文件
cp /oradata/control_file/control01.ctl /oradata/control_file/control01.ctl.bak
(3).恢复控制文件
restore standby controlfile to '/oradata/control_file/control01.ctl' from '/tmp/ForStandby_5gsv3ehf_1_1';
(4).查看恢复控制文件内容
alter database backup controlfile to trace ;
* 由于控制文件是从主库恢复过来的，因此需要确认相关文件的文件名是否一致，相关命令:
SELECT a.FILE#, a.NAME,a.CHECKPOINT_CHANGE#,a.LAST_CHANGE#,status FROM v$datafile a;
alter system set standby_file_management=manual;
alter database rename file 'file_name' to 'file_name';
6.在备库应用增量备份
RMAN> RECOVER DATABASE NOREDO;
Starting recover at 2018-03-30 16:00:23
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=22 device type=DISK
channel ORA_DISK_1: starting incremental datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
destination for restore of datafile 00001: /oradata/racdb12cdg/datafilesys/datafile/system.271.960743017
destination for restore of datafile 00002: /oradata/racdb12cdg/datafilesys/datafile/sysaux.272.960743041
destination for restore of datafile 00003: /oradata/racdb12cdg/datafilesys/datafile/undotbs1.273.960743055
destination for restore of datafile 00004: /oradata/racdb12cdg/datafilesys/datafile/undotbs2.275.960743081
destination for restore of datafile 00005: /oradata/racdb12cdg/datafilesys/datafile/users.276.960743083
destination for restore of datafile 00006: /oradata/racdb12cdg/datafileuser/datafile/ees_dat01.dbf
destination for restore of datafile 00007: /oradata/racdb12cdg/datafileuser/datafile/ees_idx01.dbf
destination for restore of datafile 00008: /oradata/racdb12cdg/datafileuser/datafile/ees_idx02.dbf
destination for restore of datafile 00009: /oradata/racdb12cdg/datafileuser/datafile/ees_idx03.dbf
channel ORA_DISK_1: reading from backup piece /tmp/ForStandby_5fsv3e4b_1_1
channel ORA_DISK_1: piece handle=/tmp/ForStandby_5fsv3e4b_1_1 tag=FORSTANDBY
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:55
Finished recover at 2018-03-30 16:01:21
7.确认
确认主备库SCN，并开启MRP进程，如果成功继续同步，则任务完成。
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