Oracle 10g DG 数据文件迁移案例分析

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？