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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？
本文Oracle10gDG数据文件迁移的如何实现到此结束。不曾扬帆，何以至远方。小编再次感谢大家对我们的支持！