DM7 RAC数据库怎样恢复成单机数据库

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 todir [/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 Movethe service scriptfile(/dm_home/dmdbms/bin/DmServicedmrc to /etc/rc.d/init.d/DmServicedmrc) Finished to create the service (DmServicedmrc) [root@dmks root]# service DmServicedmrc start StartingDmServicedmrc: [ OK ] [dmdba@dmks ~]$ disqlSYSDBA/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 Connectedto: 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) cant 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@10.10.10.187s 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@10.10.10.187s 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@10.10.10.187s 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@10.10.10.187s 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. timeused: 5.877(ms)

5)还原数据库

RMAN> restore database /dm_home/dmdbms/data/dameng_for_recover/dm.inifrom 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.keynot found, use default license! checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[4]. checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[3]. checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[2]. checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[1]. checkingif the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[0]. checkingif 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...... total5packages processed... RESTORE DATABASE , UPDATE ctl file...... RESTORE DATABASE , REBUILD key file...... RESTORE DATABASE , CHECK db info...... RESTORE DATABASE , UPDATE db info...... total7packages processed! CMDEND.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.iniupdate db_magic ; recover database/dm_home/dmdbms/data/dameng_for_recover/dm.ini update db_magic; checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[4]. checking ifthe database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[3]. checkingif the database under system path [/dm_home/dmdbms/data/dameng_for_recover] is running...[2]. checkingif 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]:forbidupdating database magic, needredo 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; checkingif 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] isrunning...[2]. checking if the database under system path[/dm_home/dmdbms/data/dameng_for_recover] isrunning...[1]. checking if the database under system path[/dm_home/dmdbms/data/dameng_for_recover] isrunning...[0]. checking if the database under system path[/dm_home/dmdbms/data/dameng_for_recover] isrunning, write dmrman info. EP[0] max_lsn: 76986min_ckpt_lsn = The RAC recover total redo0 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 archivelog 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，欢迎关注行业资讯频道。