共计 7204 个字符，预计需要花费 19 分钟才能阅读完成。
背景：某客户 Oracle 10g 的 DG 由于空间不足，之前将部分数据文件迁移到其他目录，如今原目录扩容成功，要将之前迁移的数据文件再次迁移回来。
环境：Oracle 10.2.0.5 DG 单机
首先想到的是 10gDG 是在 mount 模式下应用的，在测试环境可以很容易的模拟下这个需求实现的过程：
1. 查询当前 DG 的状态
2. 停止 DG 应用
3. 备份 copy 副本到新目录并切换
4. 删除之前的目录并开启应用
1. 查询当前 DG 的状态
查询当前 DG 的状态:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 – 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select name, database_role, open_mode from gv$database;
NAME DATABASE_ROLE OPEN_MODE
——— —————- ———-
JY PHYSICAL STANDBY MOUNTED
SQL> select recovery_mode from v$archive_dest_status;
RECOVERY_MODE
———————–
MANAGED REAL TIME APPLY
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
11 rows selected.
SQL> select * from v$dataguard_stats;
NAME VALUE UNIT TIME_COMPUTED
———————————- —————————————————————- —————————— ——————————
apply finish time +00 00:00:00.0 day(2) to second(1) interval 05-MAY-2018 10:04:20
apply lag +00 00:00:12 day(2) to second(0) interval 05-MAY-2018 10:04:20
estimated startup time 41 second 05-MAY-2018 10:04:20
standby has been open N 05-MAY-2018 10:04:20
transport lag +00 00:00:00 day(2) to second(0) interval 05-MAY-2018 10:04:20
可以看到 DG 处于正常应用状态。
2. 停止 DG 应用
停止 DG 应用：
SQL> alter database recover managed standby database cancel;
Database altered.
3. 备份 copy 副本到新目录并切换
3.1 确认需要迁移的数据文件
查看当前的数据文件，确认将 9,10,11 三个文件迁移回原来的目录：
SQL> select file#, name from v$datafile;
FILE# NAME
———- ——————————————————-
1 /oradata/jy/datafile/system.256.839673875
2 /oradata/jy/datafile/undotbs1.258.839673877
3 /oradata/jy/datafile/sysaux.257.839673877
4 /oradata/jy/datafile/users.259.839673877
5 /oradata/jy/datafile/example.267.839673961
6 /oradata/jy/datafile/undotbs2.268.839674103
7 /oradata/jy/datafile/dbs_d_school.276.840618437
8 /oradata/jy/datafile/dbs_cssf_gt.289.848228741
9 /datafile/dbs_data9.dbf
10 /datafile/dbs_data10.dbf
11 /datafile/dbs_data11.dbf
11 rows selected.
3.2 备份相关数据文件副本：
编写脚本：
vi copy_datafile.sh
echo “=======Begin at : `date`=======” >>/tmp/copy_datafile_`date +%Y%m%d`.log
rman target / <<EOF >>/tmp/copy_datafile_`date +%Y%m%d`.log
run {
allocate channel c1 device type disk;
allocate channel c2 device type disk;
allocate channel c3 device type disk;
backup as copy datafile 9 format ‘/oradata/jy/datafile/dbs_data9.dbf’;
backup as copy datafile 10 format ‘/oradata/jy/datafile/dbs_data10.dbf’;
backup as copy datafile 11 format ‘/oradata/jy/datafile/dbs_data11.dbf’;
release channel c1;
release channel c2;
release channel c3;
}
EOF
echo “=======End at : `date`=======” >>/tmp/copy_datafile_`date +%Y%m%d`.log
后台执行脚本：
nohup sh copy_datafile.sh &
记录的日志如下：
=======Begin at : Sat May 5 10:51:24 CST 2018=======
Recovery Manager: Release 10.2.0.5.0 – Production on Sat May 5 10:51:24 2018
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: JY (DBID=857123342, not open)
RMAN> 2> 3> 4> 5> 6> 7> 8> 9> 10> 11> 12> 13>
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: sid=152 devtype=DISK
allocated channel: c2
channel c2: sid=159 devtype=DISK
allocated channel: c3
channel c3: sid=144 devtype=DISK
Starting backup at 05-MAY-18
channel c1: starting datafile copy
input datafile fno=00009 name=/datafile/dbs_data9.dbf
output filename=/oradata/jy/datafile/dbs_data9.dbf tag=TAG20180505T105125 recid=22 stamp=975322288
channel c1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 05-MAY-18
Starting backup at 05-MAY-18
channel c1: starting datafile copy
input datafile fno=00010 name=/datafile/dbs_data10.dbf
output filename=/oradata/jy/datafile/dbs_data10.dbf tag=TAG20180505T105129 recid=23 stamp=975322292
channel c1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 05-MAY-18
Starting backup at 05-MAY-18
channel c1: starting datafile copy
input datafile fno=00011 name=/datafile/dbs_data11.dbf
output filename=/oradata/jy/datafile/dbs_data11.dbf tag=TAG20180505T105136 recid=24 stamp=975322315
channel c1: datafile copy complete, elapsed time: 00:00:25
Finished backup at 05-MAY-18
released channel: c1
released channel: c2
released channel: c3
RMAN>
Recovery Manager complete.
=======End at : Sat May 5 10:52:02 CST 2018=======
3.3 切换数据文件到 copy 副本：
RMAN> list copy of database;
using target database control file instead of recovery catalog
List of Datafile Copies
Key File S Completion Time Ckp SCN Ckp Time Name
——- —- – ————— ———- ————— —-
10 9 A 05-MAY-18 35303533 05-MAY-18 /oradata/jy/datafile/dbs_data9.dbf
11 10 A 05-MAY-18 35303533 05-MAY-18 /oradata/jy/datafile/dbs_data10.dbf
12 11 A 05-MAY-18 35303533 05-MAY-18 /oradata/jy/datafile/dbs_data11.dbf
RMAN> switch datafile 9,10,11 to copy;
datafile 9 switched to datafile copy “/oradata/jy/datafile/dbs_data9.dbf”
datafile 10 switched to datafile copy “/oradata/jy/datafile/dbs_data10.dbf”
datafile 11 switched to datafile copy “/oradata/jy/datafile/dbs_data11.dbf”
4. 删除之前的目录并开启应用
4.1 删除之前的文件：
RMAN> list copy of database;
List of Datafile Copies
Key File S Completion Time Ckp SCN Ckp Time Name
——- —- – ————— ———- ————— —-
13 9 A 05-MAY-18 35309314 05-MAY-18 /datafile/data9.dbf
14 10 A 05-MAY-18 35309314 05-MAY-18 /datafile/data10.dbf
15 11 A 05-MAY-18 35309314 05-MAY-18 /datafile/datafile11.dbf
RMAN> delete copy of datafile 9,10,11;
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=146 devtype=DISK
List of Datafile Copies
Key File S Completion Time Ckp SCN Ckp Time Name
——- —- – ————— ———- ————— —-
13 9 A 05-MAY-18 35309314 05-MAY-18 /datafile/data9.dbf
14 10 A 05-MAY-18 35309314 05-MAY-18 /datafile/data10.dbf
15 11 A 05-MAY-18 35309314 05-MAY-18 /datafile/datafile11.dbf
Do you really want to delete the above objects (enter YES or NO)? yes
deleted datafile copy
datafile copy filename=/datafile/data9.dbf recid=13 stamp=975320371
deleted datafile copy
datafile copy filename=/datafile/data10.dbf recid=14 stamp=975320371
deleted datafile copy
datafile copy filename=/datafile/datafile11.dbf recid=15 stamp=975320371
Deleted 3 objects
4.2 开启日志应用：
SQL> –recover_std_real
SQL> alter database recover managed standby database using current logfile disconnect from session;
Database altered.
SQL> set lines 1000
SQL> select * from v$dataguard_stats;
NAME VALUE UNIT TIME_COMPUTED
——————————– —————————————————————- —————————— ——————————
apply finish time +00 00:00:00.0 day(2) to second(1) interval 05-MAY-2018 10:20:56
apply lag +00 00:02:00 day(2) to second(0) interval 05-MAY-2018 10:20:56
estimated startup time 41 second 05-MAY-2018 10:20:56
standby has been open N 05-MAY-2018 10:20:56
transport lag +00 00:00:00 day(2) to second(0) interval 05-MAY-2018 10:20:56
SQL> select recovery_mode from v$archive_dest_status;
RECOVERY_MODE
———————–
MANAGED REAL TIME APPLY
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
11 rows selected.
至此，就完成了客户的需求，我们可以多思考一下，如果客户环境是 11g 的 ADG 环境呢？会有哪些不同呢？
更多 Oracle 相关信息见 Oracle 专题页面 https://www.linuxidc.com/topicnews.aspx?tid=12
