ADG主库上归档丢失恢复备库测试

模拟了下在主库上丢失归档导致备库出现gap，无需重建恢复备库的情况

1制造gap

主库

ALTER system SET log_archive_dest_state_2 = ‘defer’;

一些dml操作

alter system switch logfile;

备库此时的mrp是等待log状态

SQL> select process,client_process,sequence#,status from v$managed_standby;

PROCESS CLIENT_PROCESS SEQUENCE# STATUS

ARCH ARCH 0 CONNECTED

ARCH ARCH 0 CONNECTED

ARCH ARCH 0 CONNECTED

ARCH ARCH 22 CLOSING

RFS UNKNOWN 0 IDLE

RFS ARCH 0 IDLE

MRP0 N/A 23 WAIT_FOR_LOG

SQL> select * from v$archive_gap;

no rows selected

现在的这种情况oracle不认为是gap，所以没记录

主库上查看当前sequence

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination /data/arch

Oldest online log sequence 25

Next log sequence to archive 27

Current log sequence 27

从库查看应用的归档

SQL> select sequence#, applied from v$archived_log where applied=’YES’ order by sequence#;

SEQUENCE# APPLIED

10 YES
11 YES
12 YES
13 YES
14 YES
14 YES
15 YES
15 YES
16 YES
16 YES
17 YES

SEQUENCE# APPLIED

18 YES
19 YES
20 YES
21 YES
22 YES

主库上删除24,25，26三个sequence归档

select sequence#,name from v$archived_log;

主库

ALTER system SET log_archive_dest_state_2 = ‘enable’;

在备库上查看

select * from v$archive_gap;

THREAD# LOW_SEQUENCE# HIGH_SEQUENCE#

1        24         26

发现已经丢失了24,25,26三个归档文件

SQL> select sequence#,applied from v$archived_log;

SEQUENCE# APPLIED

10 YES
11 YES
12 YES
13 YES
14 YES
15 YES
15 YES
14 YES
16 YES
16 YES
17 YES

SEQUENCE# APPLIED

17 NO
18 YES
18 NO
19 YES
20 YES
21 YES
22 YES
23 YES
27 NO

停止从库的同步

SELECT (SELECT MIN(d.CHECKPOINT_CHANGE#) FROM vdatafile d) datafile_scn,
(SELECT MIN(d.CHECKPOINT_CHANGE#)
FROM vdatafile_header d

WHERE rownum = 1) datafile_header_scn,

(SELECT current_scn FROM vdatabase) current_scn,
(SELECT b.NEXT_CHANGE#
FROM varchived_log b

WHERE b.SEQUENCE# = 23

AND resetlogs_change# =

(SELECT d.RESETLOGS_CHANGE# FROM v$database d)

AND rownum = 1) NEXT_CHANGE#

FROM dual;

查找最小的scn

DATAFILE_SCN DATAFILE_HEADER_SCN CURRENT_SCN NEXT_CHANGE#

1017228         1017228     1017227      1017228

在主库备份增量

RMAN> backup as compressed backupset incremental from SCN 1017227 database format ‘/home/oracle/standby_%d_%T_%U.bak’ include current controlfile for standby filesperset=5 tag ‘FOR STANDBY’;

传递到备库，注册应用

重启备库到nomount

show paramete control

rman恢复控制文件

RMAN> restore standby controlfile to ‘/data/oracle/app/oradata/dbadb/control01.ctl’ from ‘/home/oracle/standby_DBADB_20170422_0js2b2hl_1_1.bak’

RMAN> restore standby controlfile to ‘/data/oracle/app/fast_recovery_area/dbadb/control02.ctl’ from ‘/home/oracle/standby_DBADB_20170422_0js2b2hl_1_1.bak’;

RMAN> alter database mount;

RMAN> catalog start with ‘/home/oracle/archivelog’;

searching for all files that match the pattern /home/oracle/archivelog

List of Files Unknown to the Database

File Name: /home/oracle/archivelog/standby_DBADB_20170422_0is2b2hk_1_1.bak

Do you really want to catalog the above files (enter YES or NO)? yes

cataloging files…

cataloging done

List of Cataloged Files

File Name: /home/oracle/archivelog/standby_DBADB_20170422_0is2b2hk_1_1.bak

RMAN> recover database noredo;

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

SQL> SELECT * FROM V$ARCHIVE_GAP;

no rows selected

select sequence#,applied from v$archived_log;

SEQUENCE# APPLIED

28 YES

此时的备库是mount状态的，需要到open状态

alter database recover managed standby database cancel;

alter database open;

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

验证是否正常

参考：

http://www.cnblogs.com/lhrbest/p/4754289.html