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本篇文章为大家展示了 DM7 RAC 数据库怎样恢复成单机数据库，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
DM7 RAC 数据库恢复成单机数据库
1) 启动 RMAN 备份数据库，保证服务器处于脱机状态。
RMAN backup database /dm7/data/rac0_config/dm.ini full backupset /dm7/backup/db_rac_full_bak_recover_dbmagic
backup database /dm7/data/rac0_config/dm.ini full backupset /dm7/backup/db_rac_full_bak_recover_dbmagic
file dm.key not found, use default license!
checking if the RAC database under system path [+DMDATA/data/rac] is running....
EP [0] is checking....
EP [1] is checking....
EP[0] max_lsn: 76986
EP[0] adjust cur_lsn from [76986] to [77001]
BACKUP DATABASE [rac], execute......
CMD CHECK LSN......
BACKUP DATABASE [rac], collect dbf......
CMD CHECK ......
DBF BACKUP SUBS......
total 1 packages processed...
total 2 packages processed...
total 3 packages processed...
total 4 packages processed...
total 5 packages processed...
DBF BACKUP MAIN......
BACKUPSET [/dm7/backup/db_rac_full_bak_recover_dbmagic] END, CODE [0]......
META GENERATING......
total 9 packages processed...
total 9 packages processed!
CMD END.CODE:[0]
backup successfully!
time used: 3887.714(ms)
RMAN show backupset /dm7/backup/db_rac_full_bak_recover_dbmagic
show backupset /dm7/backup/db_rac_full_bak_recover_dbmagic
system path: +DMDATA/data/rac
db magic: -1632052820
permanent magic: 450923536
rac node: 2
page check: 0
rlog encrypt: 0
external cipher[id/name]: 0/
external hash[id/name]: 0/
length in char: 0
use new hash: 1
page size: 8 KB
extent size: 16
case sensitive: 1
log page size: 512 B
unicode_flag/charset: 0
data version: 0x7000A
sys version: V7.1.6.46-Build(2018.02.08-89107)ENT
enable policy: 0
archive flag: 1
blank_pad_mode: 0
crc_check: TRUE
backupset sig: BA
backupset version: 4009
database name: rac
backup name: DB_FULL_rac_20200616_154323_000689
backupset description:
backupset ID : 1145407476
parent backupset ID: -1
META file size : 74240
compressed level: 0
encrypt type: 0
parallel num: 1
backup range: database
mpp_timestamp: 1592293401
ddl_clone: FALSE
mpp_flag: FALSE
backup level: offline
backup type: full
without log: FALSE
START_LSN: 76987
START_SEQ: 309
END_LSN: 77001
END_SEQ: 308
base START_LSN: -1
base END_LSN: -1
base name:
base backupset:
backup time: 2020-06-16 15:43:25
min trx start lsn: 76987
min exec ver: 0x0701060C
pkg size: 0x02000000
RAC EP: 0
RAC status: OK
RAC begin lsn: 76987
RAC begin seq: 309
RAC end lsn: 77001
RAC end seq: 308
RAC base begin lsn: -1
RAC base begin seq: -1
RAC base end lsn: -1
RAC base end seq: -1
RAC EP: 1
RAC status: OK
RAC begin lsn: 77002
RAC begin seq: 308
RAC end lsn: 77001
RAC end seq: 307
RAC base begin lsn: -1
RAC base begin seq: -1
RAC base end lsn: -1
RAC base end seq: -1
backupset directory: /dm7/backup/db_rac_full_bak_recover_dbmagic
backupset name: db_rac_full_bak_recover_dbmagic
backup data file num: 5
backup piece num: 1
$file_seq |$size(KB) |$pos_desc |$content_type
0 |26103 |db_rac_full_bak_recover_dbmagic.bak |DATA
$file_seq |$group_id |$group_name |$file_id |$file_path |$mirror_path |$file_len
1 |0 |SYSTEM |0 |+DMDATA/data/rac/system.dbf | |134217728
2 |1 |ROLL |0 |+DMDATA/data/rac/roll.dbf | |134217728
3 |4 |MAIN |0 |+DMDATA/data/rac/main.dbf | |134217728
4 |5 |TS_FOR_DBF |0 |+DMDATA/data/rac/ts_for_dbf_01.dbf| |134217728
5 |5 |TS_FOR_DBF |1 |+DMDATA/data/rac/ts_for_dbf_02.dbf| |134217728
$file_seq |$file_path |$file_len |$begin_lsn |$begin_seqno |$begin_rpag_off |$end_lsn |$end_seqno |$create_time |$close_time
show backupsets successfully.
time used: 10.655(ms)2) 准备目标库，可以使用备份库，也可以重新生成库。这里是在别一台服务器上创建新库，重新生成库操作如下：
[dmdba@dmks ~]$ dminit path=/dm_home/dmdbms/data db_name=dameng_for_recover auto_overwrite=1 port_num=5336
initdb V7.1.6.46-Build(2018.02.08-89107)ENT
db version: 0x7000a
file dm.key not found, use default license!
License will expire in 14 day(s) on 2020-06-30
log file path: /dm_home/dmdbms/data/dameng_for_recover/dameng_for_recover01.log
log file path: /dm_home/dmdbms/data/dameng_for_recover/dameng_for_recover02.log
write to dir [/dm_home/dmdbms/data/dameng_for_recover].
create dm database success. 2020-06-16 16:03:18
[root@dmks root]# ./dm_service_installer.sh -i /dm_home/dmdbms/data/dameng_for_recover/dm.ini -p dmrc -t dmserver
Move the service script file(/dm_home/dmdbms/bin/DmServicedmrc to /etc/rc.d/init.d/DmServicedmrc)
Finished to create the service (DmServicedmrc)
[root@dmks root]# service DmServicedmrc start
Starting DmServicedmrc: [ OK ]
[dmdba@dmks ~]$ disql SYSDBA/SYSDBA@localhost:5336
Server[localhost:5336]:mode is normal, state is open
login used time: 10.727(ms)
disql V7.1.6.46-Build(2018.02.08-89107)ENT
Connected to: DM 7.1.6.46
SQL select permanent_magic;
LINEID PERMANENT_MAGIC
---------- ---------------
1 -1238913195
used time: 0.793(ms). Execute id is 809.
SQL select db_magic from v$rlog;
LINEID DB_MAGIC
---------- -----------
1 1319824724
used time: 0.984(ms). Execute id is 810.3) 将备份集和归档日志文件复制到目标库所在主机上
[dmdba@dmrac1 backup]$ scp -r db_rac_full_bak_recover_dbmagic dmdba@10.10.10.187:/dm_home/dmdbms/backup/
The authenticity of host 10.10.10.187 (10.10.10.187) can t be established.
RSA key fingerprint is 34:9a:d7:67:6d:be:20:45:21:ce:96:82:23:e5:e9:11.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 10.10.10.187 (RSA) to the list of known hosts.
dmdba@10.10.10.187 s password:
db_rac_full_bak_recover_dbmagic.meta 100% 73KB 72.5KB/s 00:00
db_rac_full_bak_recover_dbmagic.bak 100% 25MB 25.5MB/s 00:00
[dmdba@dmrac1 data]$ scp -r local_arch dmdba@10.10.10.187:/dm_home/dmdbms/backup/
dmdba@10.10.10.187 s password:
ARCHIVE_LOCAL1_20200528171255857_0.log 100% 157KB 156.5KB/s 00:00
[dmdba@dmrac1 data]$ scp -r rac0_arch dmdba@10.10.10.187:/dm_home/dmdbms/backup/
dmdba@10.10.10.187 s password:
ARCHIVE_LOCAL1_20200615164953273_0.log 100% 160KB 160.0KB/s 00:00
ARCHIVE_LOCAL1_20200615165648166_0.log 100% 157KB 157.0KB/s 00:00
ARCHIVE_LOCAL1_20200528202150715_0.log 100% 277KB 277.0KB/s 00:00
ARCHIVE_LOCAL1_20200608151836879_0.log 100% 158KB 157.5KB/s 00:00
ARCHIVE_LOCAL1_20200609150852829_0.log 100% 157KB 157.0KB/s 00:00
ARCHIVE_LOCAL1_20200608152638617_0.log 100% 159KB 158.5KB/s 00:00
ARCHIVE_LOCAL1_20200609170732487_0.log 100% 161KB 160.5KB/s 00:00
ARCHIVE_LOCAL1_20200615172117341_0.log 100% 159KB 158.5KB/s 00:00
ARCHIVE_LOCAL1_20200615171042444_0.log 100% 159KB 159.0KB/s 00:00
ARCHIVE_LOCAL1_20200605154214367_0.log 100% 157KB 157.0KB/s 00:00
[dmdba@dmrac1 data]$ scp -r rac1_arch dmdba@10.10.10.187:/dm_home/dmdbms/backup/
dmdba@10.10.10.187 s password:
ARCH_REMOTE1_20200608152641970_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200609170737070_1.log 100% 159KB 159.0KB/s 00:00
ARCH_REMOTE1_20200609150857056_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200615172121038_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200608151838201_1.log 100% 5632 5.5KB/s 00:00
ARCH_REMOTE1_20200528202146001_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200615164957743_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200605154211189_1.log 100% 159KB 159.0KB/s 00:00
ARCH_REMOTE1_20200615165652504_1.log 100% 158KB 158.0KB/s 00:00
ARCH_REMOTE1_20200615171046600_1.log 100% 158KB 158.0KB/s 00:00
[dmdba@dmrac1 data]$
4) 检验备份
RMAN check backupset /dm_home/dmdbms/backup/db_rac_full_bak_recover_dbmagic
check backupset /dm_home/dmdbms/backup/db_rac_full_bak_recover_dbmagic
CMD END.CODE:[0]
check backupset successfully.
time used: 5.877(ms)5) 还原数据库
RMAN restore database /dm_home/dmdbms/data/dameng_for_recover/dm.ini from backupset /dm_home/dmdbms/backup/db_rac_full_bak_recover_dbmagic
restore database /dm_home/dmdbms/data/dameng_for_recover/dm.ini from backupset /dm_home/dmdbms/backup/db_rac_full_bak_recover_dbmagic
file dm.key not found, use default license!
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[4].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[3].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[2].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[1].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[0].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running, write dmrman info.
RESTORE DATABASE CHECK......
RESTORE DATABASE , dbf collect......
RESTORE DATABASE , dbf refresh ......
RESTORE BACKUPSET [/dm_home/dmdbms/backup/db_rac_full_bak_recover_dbmagic] START......
total 5 packages processed...
RESTORE DATABASE , UPDATE ctl file......
RESTORE DATABASE , REBUILD key file......
RESTORE DATABASE , CHECK db info......
RESTORE DATABASE , UPDATE db info......
total 7 packages processed!
CMD END.CODE:[0]
restore successfully.
time used: 16226.253(ms)6) 恢复数据库
RMAN recover database /dm_home/dmdbms/data/dameng_for_recover/dm.ini update db_magic ;
recover database /dm_home/dmdbms/data/dameng_for_recover/dm.ini update db_magic;
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[4].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[3].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[2].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[1].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[0].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running, write dmrman info.
EP[0] max_lsn: 76986
[-8308]:forbid updating database magic, need redo log这里使用 update db_magic 选项出错了，提示需要重做日志文件。下面去掉 update db_magic 选项，因为每次还原恢复时也是一定会更新 db_magic 值。
RMAN recover database /dm_home/dmdbms/data/dameng_for_recover/dm.ini with archivedir /dm_home/dmdbms/backup/rac0_arch , /dm_home/dmdbms/backup/rac1_arch
recover database /dm_home/dmdbms/data/dameng_for_recover/dm.ini with archivedir /dm_home/dmdbms/backup/rac0_arch , /dm_home/dmdbms/backup/rac1_arch
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[4].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[3].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[2].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[1].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[0].
checking if the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running, write dmrman info.
EP[0] max_lsn: 76986
min_ckpt_lsn =
The RAC recover total redo 0 ptx
EP(0) slot ctl page(1, 0, 16) trxid = 9986
EP(1) slot ctl page(1, 0, 17) trxid = 8457
EP[0] Recover LSN from 76987 to 77001.
EP[1] Recover LSN from 77002 to 77001.
Recover from archive log finished, time used:0.006s.
recover successfully!
time used: 7027.075(ms)7）检查数据，查询表 t1 的数据可以验证数据恢复成功
[dmdba@dmks ~]$ disql SYSDBA/SYSDBA@localhost:5336
Server[localhost:5336]:mode is normal, state is open
login used time: 10.727(ms)
disql V7.1.6.46-Build(2018.02.08-89107)ENT
Connected to: DM 7.1.6.46
SQL desc t1;
LINEID NAME TYPE$ NULLABLE
---------- ---- ----------- --------
1 ID INTEGER Y
2 NAME VARCHAR(20) Y
used time: 20.311(ms). Execute id is 3.
SQL select * from t1;
LINEID ID NAME
---------- ----------- ----
1 1 jy
2 2 hy
used time: 1.138(ms). Execute id is 4.8）检查 db_magic，还原恢复后 db_magic 从 -1632052820 变成了 1009602608，
SQL select permanent_magic;
LINEID PERMANENT_MAGIC
---------- ---------------
1 450923536
used time: 1.042(ms). Execute id is 5.
SQL select db_magic from v$rlog;
LINEID DB_MAGIC
---------- -----------
1 1009602608
used time: 1.332(ms). Execute id is 6.上述内容就是 DM7 RAC 数据库怎样恢复成单机数据库，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注丸趣 TV 行业资讯频道。
