目录
一、下载镜像二、DG环境初始化三、主库做备份操作四、主库查询SCN，后续恢复到该时间点五、主库还原，做不完全恢复六、备库做闪回操作七、查询主备库是否实时同步八、总结
本文介绍一下，在DG环境中，主库使用rman做不完全恢复后，备库如何通过flashback操作，继续和主库保持同步，而不用重新搭建DG。
主备库均已开启闪回数据库特性。
一、下载镜像
小麦苗DG环境的hub地址：
https://hub.docker.com/r/lhrbest/dg_pri_11.2.0.4/tags
https://hub.docker.com/r/lhrbest/dg_phy_11.2.0.4/tags
1nohup docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_phy_11.2.0.4:1.0 &
2nohup docker pull registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_pri_11.2.0.4:1.0 &
查看镜像：
1[root@docker36 ~]# docker images | grep dg
2registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_phy_11.2.0.4 1.0 f2ea019fe540 15 hours ago 10.7GB
3registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_pri_11.2.0.4 1.0 b7fae2029b40 15 hours ago 10.8GB
给镜像打tag：
1[root@docker36 ~]# docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_phy_11.2.0.4:1.0 lhrbest/dg_phy_11.2.0.4:1.0
2[root@docker36 ~]# docker tag registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_pri_11.2.0.4:1.0 lhrbest/dg_pri_11.2.0.4:1.0
3
4[root@docker36 ~]# docker images | grep dg
5lhrbest/dg_phy_11.2.0.4 1.0 f2ea019fe540 15 hours ago 10.7GB
6registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_phy_11.2.0.4 1.0 f2ea019fe540 15 hours ago 10.7GB
7lhrbest/dg_pri_11.2.0.4 1.0 b7fae2029b40 15 hours ago 10.8GB
8registry.cn-hangzhou.aliyuncs.com/lhrbest/dg_pri_11.2.0.4 1.0 b7fae2029b40 15 hours ago 10.8GB
二、DG环境初始化
DG环境情况见下表：
| 项目 | 主库 | 物理备库 |
|---|---|---|
| db 类型 | 单实例 | 单实例 |
| db version | 11.2.0.4.0 | 11.2.0.4.0 |
| db 存储 | FS | FS |
| OS版本 | RHEL7.6 64位 | CentOS7.6 64位 |
| OS hostname | LHR11G | LHR11GDG |
| IP地址 | 192.168.68.68 | 192.168.68.69 |
| ORACLE_SID | LHR11G | LHR11GDG |
| db_name/GLOBAL_DBNAME | LHR11G | LHR11G |
| db_unique_name | LHR11G | LHR11GDG |
| TNS_NAME | LHR11G | LHR11GDG |
| 监听端口 | 1521 | 1521 |
| 映射的主机端口 | 1528 | 1529 |
| ORACLE_HOME | /u01/app/oracle/product/11.2.0.4/dbhome_1 | /u01/app/oracle/product/11.2.0.4/dbhome_1 |
| dbid | 2007947551 | 2007947551 |
1-- 创建DG的网络
2docker network create --subnet=192.168.68.0/16 mhalhr
3docker network inspect mhalhr
4
5-- 分别初始化主库和备库
6docker run -itd --name LHR11G -h LHR11G \
7 -p 1528:1521 -p 1128:1158 -p 228:22 -p 3398:3389 \
8 --network mhalhr --ip 192.168.68.68 \
9 --privileged=true \
10 lhrbest/dg_pri_11.2.0.4:1.0 init
11
12
13docker run -itd --name LHR11GDG -h LHR11GDG \
14 -p 1529:1521 -p 1129:1158 -p 229:22 -p 3399:3389 \
15 --network mhalhr --ip 192.168.68.69 \
16 --privileged=true \
17 lhrbest/dg_phy_11.2.0.4:1.0 init
18
19
20 -- 添加网卡
21docker network connect bridge LHR11G
22docker network connect bridge LHR11GDG
23
24
25-- 进入容器
26docker exec -it LHR11G bash
27docker exec -it LHR11GDG bash
28
29-- 分别启动主库、备库和监听
30su - oracle
31lsnrctl start
32sas
33startup
查询目前DG的同步情况：
1-- 查询目前DG部署
2DGMGRL> show configuration
3
4Configuration - LHR11G
5
6 Protection Mode: MaxPerformance
7 Databases:
8 LHR11G - Primary database
9 LHR11GDG - Physical standby database
10
11Fast-Start Failover: DISABLED
12
13Configuration Status:
14SUCCESS
15
16-- 主库
17SYS@LHR11G> select flashback_on,db_unique_name,database_role from v$database;
18
19FLASHBACK_ON DB_UNIQUE_NAME DATABASE_ROLE
20------------------------------------ ------------------------------------------------------------ --------------------------------
21YES LHR11G PRIMARY
22
23
24
25-- 备库
26
27SYS@LHR11GDG> select flashback_on,db_unique_name,database_role from v$database;
28
29FLASHBACK_ON DB_UNIQUE_NAME DATABASE_ROLE
30------------------------------------ ------------------------------------------------------------ --------------------------------
31YES LHR11GDG PHYSICAL STANDBY
这里需要说明的是，我这套环境做过多次的主备切换操作，所以，建议做实验之前，把归档日志号切换增长到50以上，多次执行“alter system switch logfile;”即可：
1-- 主库
2SYS@LHR11G> archive log list;
3Database log mode Archive Mode
4Automatic archival Enabled
5Archive destination USE_DB_RECOVERY_FILE_DEST
6Oldest online log sequence 52
7Next log sequence to archive 54
8Current log sequence 54
9
10-- 备库
11SYS@LHR11GDG> @dg_status
12
13 THREAD# NAME SEQUENCE# APPLIED FIRST_TIME
14---------- ---------------------------------------------------------------------------------------------------- ---------- ------------------ -------------------
15 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_49_hssgortv_.arc 49 YES 2020-10-31 09:15:35
16 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_50_hssgosm5_.arc 50 YES 2020-10-31 09:15:36
17 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_51_hssgp5hh_.arc 51 YES 2020-10-31 09:15:37
18 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_52_hssgp66k_.arc 52 YES 2020-10-31 09:15:49
19 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_53_hssgp6wc_.arc 53 IN-MEMORY 2020-10-31 09:15:50
另外，把闪回恢复区设置大一点，例如：alter system set db_recovery_file_dest_size=8g;
三、主库做备份操作
1[oracle@lhr11g ~]$ rman target /
2
3Recovery Manager: Release 11.2.0.4.0 - Production on Sat Oct 31 09:20:41 2020
4
5Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
6
7connected to target database: LHR11G (DBID=2007947551)
8
9RMAN> run
102> {
113> backup as compressed backupset database;
124> backup archivelog all ;
13 sql 'alter system archive log current';
145> backup archivelog all ;
156> backup current controlfile;
167> }
17
18Starting backup at 2020-10-31 09:20:44
19using target database control file instead of recovery catalog
20allocated channel: ORA_DISK_1
21channel ORA_DISK_1: SID=191 device type=DISK
22channel ORA_DISK_1: starting compressed full datafile backup set
23channel ORA_DISK_1: specifying datafile(s) in backup set
24input datafile file number=00001 name=/u01/app/oracle/oradata/LHR11G/system01.dbf
25input datafile file number=00002 name=/u01/app/oracle/oradata/LHR11G/sysaux01.dbf
26input datafile file number=00003 name=/u01/app/oracle/oradata/LHR11G/undotbs01.dbf
27input datafile file number=00005 name=/u01/app/oracle/oradata/LHR11G/example01.dbf
28input datafile file number=00004 name=/u01/app/oracle/oradata/LHR11G/users01.dbf
29channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:20:46
30channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:01
31piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_nnndf_TAG20201031T092045_hssgzg25_.bkp tag=TAG20201031T092045 comment=NONE
32channel ORA_DISK_1: backup set complete, elapsed time: 00:01:15
33channel ORA_DISK_1: starting compressed full datafile backup set
34channel ORA_DISK_1: specifying datafile(s) in backup set
35including current control file in backup set
36including current SPFILE in backup set
37channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:02
38channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:03
39piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_ncsnf_TAG20201031T092045_hssh1t5y_.bkp tag=TAG20201031T092045 comment=NONE
40channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
41Finished backup at 2020-10-31 09:22:03
42RMAN-08591: WARNING: invalid archived log deletion policy
43
44sql statement: alter system archive log current
45
46Starting backup at 2020-10-31 09:22:04
47current log archived
48using channel ORA_DISK_1
49channel ORA_DISK_1: starting archived log backup set
50channel ORA_DISK_1: specifying archived log(s) in backup set
51input archived log thread=1 sequence=14 RECID=1 STAMP=1054919461
52input archived log thread=1 sequence=15 RECID=3 STAMP=1054919751
53input archived log thread=1 sequence=16 RECID=2 STAMP=1054919751
54input archived log thread=1 sequence=17 RECID=4 STAMP=1054919820
55input archived log thread=1 sequence=18 RECID=5 STAMP=1054919827
56input archived log thread=1 sequence=19 RECID=6 STAMP=1054919829
57input archived log thread=1 sequence=20 RECID=7 STAMP=1054919831
58input archived log thread=1 sequence=21 RECID=11 STAMP=1054919840
59input archived log thread=1 sequence=22 RECID=13 STAMP=1054919858
60input archived log thread=1 sequence=23 RECID=15 STAMP=1054919903
61input archived log thread=1 sequence=24 RECID=17 STAMP=1054919906
62input archived log thread=1 sequence=25 RECID=19 STAMP=1054919909
63input archived log thread=1 sequence=26 RECID=21 STAMP=1054920097
64channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:04
65channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:05
66piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_annnn_TAG20201031T092204_hssh1wl7_.bkp tag=TAG20201031T092204 comment=NONE
67channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
68channel ORA_DISK_1: starting archived log backup set
69channel ORA_DISK_1: specifying archived log(s) in backup set
70input archived log thread=1 sequence=1 RECID=22 STAMP=1054920097
71input archived log thread=1 sequence=2 RECID=23 STAMP=1054920097
72input archived log thread=1 sequence=3 RECID=24 STAMP=1054920097
73input archived log thread=1 sequence=4 RECID=25 STAMP=1054920100
74input archived log thread=1 sequence=5 RECID=26 STAMP=1054920112
75input archived log thread=1 sequence=6 RECID=28 STAMP=1054920284
76channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:05
77channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:06
78piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_annnn_TAG20201031T092204_hssh1xp8_.bkp tag=TAG20201031T092204 comment=NONE
79channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
80channel ORA_DISK_1: starting archived log backup set
81channel ORA_DISK_1: specifying archived log(s) in backup set
82input archived log thread=1 sequence=1 RECID=27 STAMP=1054920279
83input archived log thread=1 sequence=2 RECID=29 STAMP=1054920284
84input archived log thread=1 sequence=3 RECID=30 STAMP=1054920397
85input archived log thread=1 sequence=4 RECID=35 STAMP=1054920436
86input archived log thread=1 sequence=5 RECID=37 STAMP=1054920446
87input archived log thread=1 sequence=6 RECID=39 STAMP=1055236276
88input archived log thread=1 sequence=7 RECID=41 STAMP=1055236281
89input archived log thread=1 sequence=8 RECID=44 STAMP=1055236334
90channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:06
91channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:07
92piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_annnn_TAG20201031T092204_hssh1yt7_.bkp tag=TAG20201031T092204 comment=NONE
93channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
94channel ORA_DISK_1: starting archived log backup set
95channel ORA_DISK_1: specifying archived log(s) in backup set
96input archived log thread=1 sequence=9 RECID=46 STAMP=1055236406
97input archived log thread=1 sequence=10 RECID=47 STAMP=1055236409
98input archived log thread=1 sequence=11 RECID=49 STAMP=1055236417
99input archived log thread=1 sequence=12 RECID=51 STAMP=1055236418
100input archived log thread=1 sequence=13 RECID=53 STAMP=1055236419
101input archived log thread=1 sequence=14 RECID=55 STAMP=1055236420
102input archived log thread=1 sequence=15 RECID=57 STAMP=1055236421
103input archived log thread=1 sequence=16 RECID=59 STAMP=1055236422
104input archived log thread=1 sequence=17 RECID=61 STAMP=1055236422
105input archived log thread=1 sequence=18 RECID=63 STAMP=1055236423
106input archived log thread=1 sequence=19 RECID=65 STAMP=1055236424
107input archived log thread=1 sequence=20 RECID=67 STAMP=1055236425
108input archived log thread=1 sequence=21 RECID=69 STAMP=1055236425
109input archived log thread=1 sequence=22 RECID=71 STAMP=1055236426
110input archived log thread=1 sequence=23 RECID=73 STAMP=1055236427
111input archived log thread=1 sequence=24 RECID=75 STAMP=1055236427
112input archived log thread=1 sequence=25 RECID=77 STAMP=1055236428
113input archived log thread=1 sequence=26 RECID=79 STAMP=1055236428
114input archived log thread=1 sequence=27 RECID=81 STAMP=1055236429
115input archived log thread=1 sequence=28 RECID=83 STAMP=1055236430
116input archived log thread=1 sequence=29 RECID=85 STAMP=1055236430
117input archived log thread=1 sequence=30 RECID=87 STAMP=1055236431
118input archived log thread=1 sequence=31 RECID=89 STAMP=1055236432
119input archived log thread=1 sequence=32 RECID=91 STAMP=1055236432
120input archived log thread=1 sequence=33 RECID=93 STAMP=1055236433
121input archived log thread=1 sequence=34 RECID=95 STAMP=1055236434
122input archived log thread=1 sequence=35 RECID=97 STAMP=1055236434
123input archived log thread=1 sequence=36 RECID=100 STAMP=1055236435
124input archived log thread=1 sequence=37 RECID=101 STAMP=1055236436
125input archived log thread=1 sequence=38 RECID=103 STAMP=1055236436
126input archived log thread=1 sequence=39 RECID=105 STAMP=1055236437
127input archived log thread=1 sequence=40 RECID=107 STAMP=1055236437
128input archived log thread=1 sequence=41 RECID=109 STAMP=1055236439
129input archived log thread=1 sequence=42 RECID=111 STAMP=1055236511
130input archived log thread=1 sequence=43 RECID=113 STAMP=1055236514
131input archived log thread=1 sequence=44 RECID=115 STAMP=1055236517
132input archived log thread=1 sequence=45 RECID=117 STAMP=1055236519
133input archived log thread=1 sequence=46 RECID=119 STAMP=1055236531
134input archived log thread=1 sequence=47 RECID=121 STAMP=1055236532
135input archived log thread=1 sequence=48 RECID=123 STAMP=1055236535
136input archived log thread=1 sequence=49 RECID=125 STAMP=1055236536
137input archived log thread=1 sequence=50 RECID=128 STAMP=1055236537
138input archived log thread=1 sequence=51 RECID=129 STAMP=1055236549
139input archived log thread=1 sequence=52 RECID=131 STAMP=1055236550
140input archived log thread=1 sequence=53 RECID=133 STAMP=1055236550
141input archived log thread=1 sequence=54 RECID=135 STAMP=1055236924
142input archived log thread=1 sequence=55 RECID=136 STAMP=1055236924
143channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:08
144channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:09
145piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_annnn_TAG20201031T092204_hssh202w_.bkp tag=TAG20201031T092204 comment=NONE
146channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
147Finished backup at 2020-10-31 09:22:09
148RMAN-08591: WARNING: invalid archived log deletion policy
149
150Starting backup at 2020-10-31 09:22:10
151using channel ORA_DISK_1
152channel ORA_DISK_1: starting full datafile backup set
153channel ORA_DISK_1: specifying datafile(s) in backup set
154including current control file in backup set
155channel ORA_DISK_1: starting piece 1 at 2020-10-31 09:22:11
156channel ORA_DISK_1: finished piece 1 at 2020-10-31 09:22:12
157piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_ncnnf_TAG20201031T092210_hssh237k_.bkp tag=TAG20201031T092210 comment=NONE
158channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
159Finished backup at 2020-10-31 09:22:12
160RMAN-08591: WARNING: invalid archived log deletion policy
161
162RMAN>
163
四、主库查询SCN，后续恢复到该时间点
1SYS@LHR11G> alter system switch logfile;
2
3System altered.
4
5SYS@LHR11G>
6SYS@LHR11G> select current_scn from v$database;
7
8CURRENT_SCN
9-----------
10 1373192
11
12SYS@LHR11G> alter system switch logfile;
13
14System altered.
15
16SYS@LHR11G> create table lhr.emp1 as select * from scott.emp;
17
18Table created.
19
20SYS@LHR11G> alter system switch logfile;
21
22System altered.
23
24-- 备库查询
25SYS@LHR11GDG> @dg_status
26
27 THREAD# NAME SEQUENCE# APPLIED FIRST_TIME
28---------- ---------------------------------------------------------------------------------------------------- ---------- ------------------ -------------------
29 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_54_hssh1w8f_.arc 54 YES 2020-10-31 09:15:50
30 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_55_hssh205f_.arc 55 YES 2020-10-31 09:22:04
31 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_56_hssh6g23_.arc 56 YES 2020-10-31 09:22:04
32 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_57_hssh7dd2_.arc 57 YES 2020-10-31 09:24:29
33 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_58_hssh817g_.arc 58 IN-MEMORY 2020-10-31 09:25:00
34
35SYS@LHR11GDG> select count(*) from lhr.emp1;
36
37 COUNT(*)
38----------
39 14
说明主备是同步的，接下来我们对主库做不完全恢复。
五、主库还原，做不完全恢复
假设主库出现很严重的错误，必须使用rman做不完全恢复，现在要恢复主库到SCN为 1373192
1[oracle@lhr11g ~]$ rman target /
2
3Recovery Manager: Release 11.2.0.4.0 - Production on Sat Oct 31 09:27:38 2020
4
5Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
6
7connected to target database: LHR11G (DBID=2007947551)
8
9RMAN> shutdown abort
10
11using target database control file instead of recovery catalog
12Oracle instance shut down
13
14RMAN> startup mount
15
16connected to target database (not started)
17Oracle instance started
18database mounted
19
20Total System Global Area 325685248 bytes
21
22Fixed Size 2252944 bytes
23Variable Size 192941936 bytes
24Database Buffers 125829120 bytes
25Redo Buffers 4661248 bytes
26
27RMAN> restore database;
28
29Starting restore at 2020-10-31 09:28:01
30allocated channel: ORA_DISK_1
31channel ORA_DISK_1: SID=3 device type=DISK
32
33channel ORA_DISK_1: starting datafile backup set restore
34channel ORA_DISK_1: specifying datafile(s) to restore from backup set
35channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/LHR11G/system01.dbf
36channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/LHR11G/sysaux01.dbf
37channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/LHR11G/undotbs01.dbf
38channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/LHR11G/users01.dbf
39channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/LHR11G/example01.dbf
40channel ORA_DISK_1: reading from backup piece /u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_nnndf_TAG20201031T092045_hssgzg25_.bkp
41channel ORA_DISK_1: piece handle=/u01/app/oracle/flash_recovery_area/LHR11G/backupset/2020_10_31/o1_mf_nnndf_TAG20201031T092045_hssgzg25_.bkp tag=TAG20201031T092045
42channel ORA_DISK_1: restored backup piece 1
43channel ORA_DISK_1: restore complete, elapsed time: 00:01:25
44Finished restore at 2020-10-31 09:29:27
45
46RMAN> recover database until scn 1373192;
47
48Starting recover at 2020-10-31 09:29:32
49using channel ORA_DISK_1
50
51starting media recovery
52
53archived log for thread 1 with sequence 54 is already on disk as file /u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_54_hssh1w5j_.arc
54archived log for thread 1 with sequence 55 is already on disk as file /u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_55_hssh1w7d_.arc
55archived log for thread 1 with sequence 56 is already on disk as file /u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_56_hssh6fz3_.arc
56archived log for thread 1 with sequence 57 is already on disk as file /u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_57_hssh7d8w_.arc
57archived log file name=/u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_54_hssh1w5j_.arc thread=1 sequence=54
58archived log file name=/u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_55_hssh1w7d_.arc thread=1 sequence=55
59archived log file name=/u01/app/oracle/flash_recovery_area/LHR11G/archivelog/2020_10_31/o1_mf_1_56_hssh6fz3_.arc thread=1 sequence=56
60media recovery complete, elapsed time: 00:00:00
61Finished recover at 2020-10-31 09:29:33
62
63RMAN> alter database open resetlogs;
64
65database opened
66
67RMAN> exit
68
69
70Recovery Manager complete.
主库查询：
1[oracle@lhr11g ~]$ sas
2
3SQL*Plus: Release 11.2.0.4.0 Production on Sat Oct 31 09:30:20 2020
4
5Copyright (c) 1982, 2013, Oracle. All rights reserved.
6
7
8Connected to:
9Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
10With the Partitioning, OLAP, Data Mining and Real Application Testing options
11
12SYS@LHR11G> select count(*) from lhr.emp1;
13select count(*) from lhr.emp1
14 *
15ERROR at line 1:
16ORA-00942: table or view does not exist
17
18
19SYS@LHR11G> select resetlogs_change# from v$database;
20
21RESETLOGS_CHANGE#
22-----------------
23 1373193
24
25SYS@LHR11G> create table lhr.emp2 as select * from scott.emp;
26
27Table created.
备库查询：
1SYS@LHR11GDG> select count(*) from lhr.emp1;
2
3 COUNT(*)
4----------
5 14
6
7SYS@LHR11GDG> select * from lhr.emp2;
8select * from lhr.emp2
9 *
10ERROR at line 1:
11ORA-00942: table or view does not exist
可见，主备关系已经断掉了，不能再自动同步了。
备库的告警日志：
1A new recovery destination branch has been registered
2RFS[5]: Standby in the future of new recovery destinationBranch(resetlogs_id) 1055237385
3Incomplete Recovery SCN: 1373219
4Resetlogs SCN: 1373193
5Standby Became Primary SCN: 1361559
6Flashback database to SCN 1361559 to follow new branch
7Flashback database to SCN 1361559 to follow new branch
8RFS[5]: New Archival REDO Branch(resetlogs_id): 1055237385 Prior: 1054920278
9RFS[5]: Archival Activation ID: 0x78326358 Current: 0x782dc04f
10RFS[5]: Effect of primary database OPEN RESETLOGS
11RFS[5]: Managed Standby Recovery process is active
12RFS[5]: Incarnation entry added for Branch(resetlogs_id): 1055237385 (LHR11GDG)
13Sat Oct 31 09:29:48 2020
14Setting recovery target incarnation to 8
15Sat Oct 31 09:29:48 2020
16MRP0: Incarnation has changed! Retry recovery...
17Errors in file /u01/app/oracle/diag/rdbms/lhr11gdg/LHR11GDG/trace/LHR11GDG_pr00_1076.trc:
18ORA-19906: recovery target incarnation changed during recovery
19Managed Standby Recovery not using Real Time Apply
20Managed Standby Recovery not using Real Time Apply
21Sat Oct 31 09:29:48 2020
22Archived Log entry 180 added for thread 1 sequence 1 ID 0x78326358 dest 1:
23Recovery interrupted!
24Recovered data files to a consistent state at change 1374084
25Sat Oct 31 09:29:49 2020
26 started logmerger process
27Sat Oct 31 09:29:49 2020
28Managed Standby Recovery starting Real Time Apply
29Warning: Recovery target destination is in a sibling branch
30of the controlfile checkpoint. Recovery will only recover
31changes to datafiles.
32Datafile 1 (ckpscn 1374084) is orphaned on incarnation#=7
33MRP0: Detected orphaned datafiles!
34Recovery will possibly be retried after flashback...
35Errors in file /u01/app/oracle/diag/rdbms/lhr11gdg/LHR11GDG/trace/LHR11GDG_pr00_1151.trc:
36ORA-19909: datafile 1 belongs to an orphan incarnation
37ORA-01110: data file 1: '/u01/app/oracle/oradata/LHR11GDG/system01.dbf'
38Managed Standby Recovery not using Real Time Apply
39Recovery Slave PR00 previously exited with exception 19909
40Sat Oct 31 09:29:52 2020
41RFS[6]: Assigned to RFS process 1157
42RFS[6]: Selected log 6 for thread 1 sequence 2 dbid 2007947551 branch 1055237385
43Sat Oct 31 09:29:52 2020
44Archived Log entry 181 added for thread 1 sequence 2 ID 0x78326358 dest 1:
45Sat Oct 31 09:29:52 2020
46Primary database is in MAXIMUM PERFORMANCE mode
47RFS[7]: Assigned to RFS process 1159
48RFS[7]: Selected log 6 for thread 1 sequence 3 dbid 2007947551 branch 1055237385
49Sat Oct 31 09:30:10 2020
50MRP0: Background Media Recovery process shutdown (LHR11GDG)
51Sat Oct 31 09:30:48 2020
52RFS[8]: Assigned to RFS process 1167
53RFS[8]: Opened log for thread 1 sequence 57 dbid 2007947551 branch 1054920278
54Archived Log entry 182 added for thread 1 sequence 57 rlc 1054920278 ID 0x782dc04f dest 2:
可以看到dg备库已经知道主库做了resetlogs，也提示dg需要flashback才能继续同步。这里提示dg需要flashback到1361559（Flashback database to SCN 1361559 to follow new branch），主库做不完全恢复的点为1373192。
下边进行修复操作。
六、备库做闪回操作
这里需要注意的是，scn号必须备库的告警日志中获取，这里获取到的是1361559，闪回操作如下：
1[oracle@lhr11gdg ~]$ sas
2
3SQL*Plus: Release 11.2.0.4.0 Production on Sat Oct 31 09:40:46 2020
4
5Copyright (c) 1982, 2013, Oracle. All rights reserved.
6
7
8Connected to:
9Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
10With the Partitioning, OLAP, Data Mining and Real Application Testing options
11
12SYS@LHR11GDG> startup force mount
13ORACLE instance started.
14
15Total System Global Area 346562560 bytes
16Fixed Size 2253144 bytes
17Variable Size 209718952 bytes
18Database Buffers 130023424 bytes
19Redo Buffers 4567040 bytes
20Database mounted.
21
22SYS@LHR11GDG> flashback database to scn 1361559;
23
24Flashback complete.
25
26SYS@LHR11GDG> alter database open;
27
28Database altered.
29
30SYS@LHR11GDG> alter database recover managed standby database using current logfile disconnect from session;
31
32Database altered.
33
34SYS@LHR11GDG> select count(*) from lhr.emp1;
35select count(*) from lhr.emp1
36 *
37ERROR at line 1:
38ORA-00942: table or view does not exist
39
40
41SYS@LHR11GDG> select count(*) from lhr.emp2;
42
43 COUNT(*)
44----------
45 14
46
47SYS@LHR11GDG> @dg_status
48
49 THREAD# NAME SEQUENCE# APPLIED FIRST_TIME
50---------- ---------------------------------------------------------------------------------------------------- ---------- ------------------ -------------------
51 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_4_hssjos1z_.arc 4 YES 2020-10-31 09:41:51
52 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_5_hssjot1o_.arc 5 YES 2020-10-31 09:49:44
53 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_6_hssjox45_.arc 6 YES 2020-10-31 09:49:45
54 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_7_hssjqs32_.arc 7 YES 2020-10-31 09:49:49
55 1 /u01/app/oracle/flash_recovery_area/LHR11GDG/archivelog/2020_10_31/o1_mf_1_8_hssjr25j_.arc 8 IN-MEMORY 2020-10-31 09:50:48
七、查询主备库是否实时同步
1[oracle@lhr11g ~]$ dgmgrl /
2DGMGRL for Linux: Version 11.2.0.4.0 - 64bit Production
3
4Copyright (c) 2000, 2009, Oracle. All rights reserved.
5
6Welcome to DGMGRL, type "help" for information.
7Connected.
8DGMGRL> show configuration
9
10Configuration - LHR11G
11
12 Protection Mode: MaxPerformance
13 Databases:
14 LHR11G - Primary database
15 LHR11GDG - Physical standby database
16
17Fast-Start Failover: DISABLED
18
19Configuration Status:
20SUCCESS
21
22
23-- 主库建表
24SYS@LHR11G> create table lhr.emp3 as select * from scott.emp;
25
26Table created.
27
28-- 备库查询
29SYS@LHR11GDG> select count(*) from lhr.emp3;
30
31 COUNT(*)
32----------
33 14
34
DG环境恢复正常。
八、总结
1、在DG环境中，建议对主库和备库都开启闪回数据库的特性，并且设置比较大的闪回恢复区（db_recovery_file_dest_size）。
2、在DG环境中，若主库做了不完全恢复，那么备库必须做相关的闪回操作才能恢复DG的同步关系。DG备库闪回的SCN号可以从备库的告警日志中获取到（Flashback database to SCN 1361559 to follow new branch）。
本文结束。
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