DM7使用dmrestore工具还原数据库

使用dmrestore工具还原数据库
1. 概述
DM支持利用还原工具对数据库进行还原。根据不同备份类型,包括联机备份、脱机备份、完全备份以及增量备份,还原工具选择不同的还原策略实现恢复用户数据的目的。首先讨论联机备份与脱机备份,脱机备份仅包含数据页文件的内容,而联机备份文件除了包含数据页文件内容以外,可能还包括备份过程中产生的日志文件内容。因此在利用联机备份还原时,除了拷贝数据页至数据库文件以外,可能还需要重做备份的日志文件内容,达到还原数据库的目的。在还原联机库备份且不带日志的备份时,需要用户指定归档目录,由用户保证备份期间的归档日志存在且完好,在还原库时,需要重做该日志。如果日志不存在,则备份文件就无效,报错归档日志错误。

接下来讨论完全备份与增量备份,对于增量备份,还原工具会根据用户提供备份的信息搜集它的基础备份,若基础备份仍然为增量备份,则工具会继续搜集,直至搜集到一个类型为完全备份的基础备份为止。因此在这个过程中,工具会构造一个基础备份链表,备份链表基于备份间的依赖关系组织。比如,备份A是备份B的增量备份,则可以说A依赖于B。若用户首先进行了一次完全备份A,然后在A的基础上做了增量备份B,随后基于增量备份B又做了增量备份C,最后基于增量备份C做了增量备份D。那么此时利用增量备份D还原数据库时,系统搜集到得备份链表如30.1所示,执行还原时,首先利用完全备份恢复A进行还原,然后依次利用增量备份B,C和D还原,最终完成整个还原过程。需要说明的是,若备份类型为B树备份的数据库备份是不存在增量备份的。

脱机库还原支持无备份文件的还原,原理就是利用归档文件,在目标库上执行REDO操作,把库还原到指定的时间点或者LSN。限制条件是,
1)目标库和归档必须是源自同一个库;2)必须保证源库的归档是完整,否则会出现不可预知的错误,即要保证备份之后产生的归档是完整的。要利用归档还原,需要利用备份文件还原一个目标库,修改目标库db_magic和源库中归档文件的db_magic一致。然后就可以执行还原操作了。库db_magic的修改可以使用dmmdf工具。
dmmdf工具的用法如下:

dmmdf KEYWORD=value
</preM
在Windows“命令提示符”窗口中输入带参数的dmmdf命令启动该工具,参数说明见
[dmdba@shard1 dmdbms]$ dmmdf help
Format:  ./dmmdf KEYWORD=value

Example: ./dmmdf TYPE=1 FILE=/opt/data/DAMENG/SYSTEM.DBF

Keyword            Explanation
--------------------------------------------------------------------------------
TYPE                type
                    1: for dbf
                    2: for rlog
                    3: for original bak
                    4: for bakset meta
                    5: for bakset bkp
                    6: for bakset
                    7: batch modify db_magic for arch file
                    8: for database degrades
                    9:batch modify crc_check for DB specified by dm.ini.
                    10:batch modify crc_check for archive log in archive directory.
FILE                file path
DCR_INI             dmdcr.ini path
DB_MAGIC_SRC        db_magic_src,for TYPE=7 and 10
DB_MAGIC_DST        db_magic_dst,for TYPE=7
CRC_CHECK           crc_check,for TYPE=9 and 10
HELP                show this help info

--------------------------------------------------
Example: ./dmmdf TYPE=1 FILE=/opt/data/DAMENG/SYSTEM.dbf
         ./dmmdf TYPE=2 FILE=/opt/data/DAMENG/DAMENG01.log
         ./dmmdf TYPE=3 FILE=/opt/data/DAMENG/bak/dmdb.bak
         ./dmmdf TYPE=4 FILE=/opt/data/DAMENG/bak/bset/nbak.meta
         ./dmmdf TYPE=5 FILE=/opt/data/DAMENG/bak/bset/nbak.bak
         ./dmmdf TYPE=6 FILE=/opt/data/DAMENG/bak/bset
         ./dmmdf TYPE=7 FILE=/opt/data/DAMENG/arch DB_MAGIC_SRC=4734373 DB_MAGIC_DST=4734366
         ./dmmdf TYPE=8 FILE=/opt/data/DAMENG/dm.ctl
         ./dmmdf TYPE=9 FILE=/opt/data/DAMENG/dm.ini,CRC_CHECK=1
         ./dmmdf TYPE=10 FILE=/opt/data/DAMENG/arch,CRC_CHECK=0,DB_MAGIC_SRC=4734373

使用说明:
dmmdf工具可以修改TYPE中指定的文件中的信息,例如db_magic。
DMRESTORE还原工具的用法如下:

DMRESTORE KEYWORD=value 或KEYWORD=(value1,value2,...,valueN)

确认DM数据库服务器已停止后,在Windows“命令提示符”窗口中输入带参数的DMRESTORE命令启动该工具

[dmdba@shard1 dmdbms]$ dmrestore help
Format: DMRESTORE  KEYWORD=value or KEYWORD=(value1,value2,...,valueN)

Eg: DMRESTORE  INI_PATH=/opt/dm7data/dameng/dm.ini FILE=/opt/dm7data/backup/test.bak

Imperative Argument: FILE

Keyword             explain(default value)
--------------------------------------------------------------------------------
INI_PATH            the path of the dmserver's dm.ini file
FILE                backup file
MAPPED_FIL              the path of mapped file, when res_type assign 4.
TIME                the timestamp of be going to recover
ARCHIVE_DIR         the directory at backup, Format (dir1,dir2,dir3,...)
BACKUP_DIR          the stored path of backup file, be used to search backup file, Format (dir1,dir2,dir3,...)
DATAFIL_PATH        the file path at the recovery, Format (id1,path1,id2,path2,id3,path3,...)
MIRROR_PATH         the mirror file path at the recovery, Format (id1,path1,id2,path2,id3,path3,...)
PARALLEL_DIR        the full path of parallel mapping file
RES_TYPE            restore type(0,1,2,3,4), 0: bakfil restore, 1: bakfil show, 2: archfil restore, 3: step increment restore, 4:output mapped file default(0)
END_LSN             restore to end_lsn
LOG                 restore output log file
DUMMY               quiet mode, {(Y)es,(N)o} default:No
PASSWORD            restore with password
ENCRYPT_NAME        restore decrypt with encrypt name
HELP                output help info

INI_PATH:配置文件路径,最大长度为256字节,可选参数
FILE:用于还原的备份文件完整路径,必选参数
MAPPED_FIL:当指定res_type为4时,输出备份文件的映射信息到该文件;如果指定res_type为0或3时,则还原时,会采用MAPPED_FIL文件中的data_path和mirror_path路径为准(如果用户希望使用相对路径策略还原,请删除相关的组,同时修改要修改的data_path和mirror_path)。此外,如果指定MAPPED_FIL参数,则本工具中datafil_path和mirror_path参数会失效;反之,则生效,可选参数
TIME:指定还原的时间点和指定还原的LSN,需要配合ARCHIVE_DIR使用,若指定了ARCHIVE_DIR,既没有指定TIME和END_LSN则会重做所有的归档;如果指定了某一个则会还原到指定的TIME或者LSN;如果都指定了,则会还原到早的一个时间点(或者LSN);如果指定END_LSN为1,则表示还原到备份的时候,不会redo归档,可选参数
END_LSN:指定还原的时间点和指定还原的LSN,需要配合ARCHIVE_DIR使用,若指定了ARCHIVE_DIR,既没有指定TIME和END_LSN则会重做所有的归档;如果指定了某一个则会还原到指定的TIME或者LSN;如果都指定了,则会还原到早的一个时间点(或者LSN);如果指定END_LSN为1,则表示还原到备份的时候,不会redo归档,可选参数。
BACKUP_DIR:备份文件存放路径,用于搜索备份文件(默认会搜索备份文件所在的目录,以及库的默认备份目录),可选参数
ARCHIVE_DIR:归档日志存放的目录,可以指定1~8个。在还原联机库备份且不带日志(WITHOUT LOG)的备份文件时,ARCHIVE_DIR为必选参数,可选参数。
DATAFIL_PATH:指定还原后的新文件路径([编号,路径],……,[编号,路径])。编号与路径成对出现,最多可以指定16个。编号为大于0的整数。MAPPED_FIL优先,可选参数。
PARALLEL_DIR:并行映射文件存放路径,用于搜索映射文件,可选参数
SHOW_BAK_INFO:可选值(0,1,2)0:表示利用备份还原;1:仅显示备份信息,不进行还原;2:表示使用归档日志进行还原;默认值为0。该参数已被RES_TYPE取代,为兼容之前版本,暂时保留。如果同时指定RES_TYPE和SHOW_BAK_INFO,则RES_TYPE有效,SHOW_BAK_INFO无效,可选参数。
RES_TYPE:可选值(0,1,2,3,4)0:表示利用备份还原;1:仅显示备份信息,不进行还原;2:表示使用归档日志进行还原;3:仅还原单个完全备份或者增量备份;4:仅仅输出备份文件映射信息到文件。默认值为0,可选参数。
MIRROR_PATH:指定备份库中的镜像文件路径在还原时的映射路径。([编号,路径],……,[编号,路径])。编号与路径成对出现,最多可以指定16个。编号为大于0的整数,映射路径绝对路径。MAPPED_FIL优先,可选参数。
LOG:指定一个文件,还原时日志会写入该文件,可选参数。
DUMMY:静默模式,可以指定{(Y)es,(N)o}。默认No。交互信息处理: 打印(P)。Y:打印所有交互信息。N:不打印交互信息。可选参数。
PASSWORD:还原时,指定备份时的加密密码
ENCRYPT_NAME:还原时用来解密的算法名。缺省算法为AES256_CFB
HELP:打印帮助信息

若设置SHOW_BAK_INFO参数为1,则不需要利用备份进行还原操作,可以不指定INI_PATH;指定了BACKUP_DIR参数时,则会收集备份目录下的所有的备份,并分组输出;如果指定了FILE,且该备份文件是增量备份,则会收集增量备份相关的所有备份输出。

数据库还原时,如果需要重做的日志量较大,将INI参数BUFFER适当设大,可以提高还原的性能。

2. 使用备份文件还原
例如,利用备份文件/dm_home/dmdba/dmdbms/data/jydm/bak/DB_jydm_20200711192046000434.bak还原数据库

[dmdba@shard1 backup]$ dmrestore ini_path=/dm_home/dmdba/dmdbms/data/jydm/dm.ini file=/dm_home/dmdba/dmdbms/data/jydm/bak/DB_jydm_20200711192046000434.bak
restore V7.1.6.46-Build(2018.02.08-89107)ENT
file dm.key not found, use default license!


backup sig:            BA
backup tool version:   12595
backup db name:        jydm
backup db magic:       -82313077
backup pemnt magic:    1250320462
backup name:           jydm
backup type:           full
backup level:          offline
backup range:          database
backup description:
compressed level:      0
encrypt_type:          0
encrypt_id:            2052
rac node:              0
page check:            0
rlog encrypt:          0
external cipher id:    0
external hash id:      0
length in char:        0
use new hash:          1
backup time:           2020-07-11 19:20:46
page size:             8 KB
extent size:           16
case sensitive:        1
log page size:         512 B
charset:               0
data version:          0x7000A
sys version:           V7.1.6.46-Build(2018.02.08-89107)ENT
enable policy:         0
mpp_timestamp:         0
crc_check:             TRUE
parallel type:         0
parallel info len:     0
backup db fil num:     8
archive flag:          1
after backup LSN:      27830642


$bak_seq |$file_path                                        |$size(K)       |$used(K)
        1|/dm_home/dmdba/dmdbms/data/jydm/bak/DB_jydm_20200711192046000434.bak|      294912.00|      284866.00


$file_seq |$type|$ts_name       |$state    |$size(K)  |$seq_in_bak    |$off_in_bak(B) |$len_in_bak(B) |$file_path                                        |$mirror_path
         1|DBF  |SYSTEM         |ONLINE    |     23552|              1|          43008|        6766592|/dm_home/dmdba/dmdbms/data/jydm/SYSTEM.DBF        |
         2|DBF  |ROLL           |ONLINE    |    229376|              1|        6809600|         401408|/dm_home/dmdba/dmdbms/data/jydm/ROLL.DBF          |
         3|DBF  |MAIN           |ONLINE    |    210944|              1|        7211008|      171753472|/dm_home/dmdba/dmdbms/data/jydm/MAIN.DBF          |
         4|DBF  |BOOKSHOP       |ONLINE    |    153600|              1|      178964480|         933888|/dm_home/dmdba/dmdbms/data/jydm/BOOKSHOP.DBF      |
         5|DBF  |DMHR           |ONLINE    |    131072|              1|      179898368|         425984|/dm_home/dmdba/dmdbms/data/jydm/DMHR.DBF          |
         6|DBF  |USERS          |ONLINE    |     51200|              1|      180324352|        1105920|/dm_home/dmdba/dmdbms/data/jydm/users01.dbf       |
         7|DBF  |SYSAUX         |ONLINE    |    179200|              1|      181430272|      110256128|/dm_home/dmdba/dmdbms/data/jydm/SYSAWR.DBF        |
         8|DBF  |FG_PERSON      |ONLINE    |    131072|              1|      291686400|          16384|/dm_home/dmdba/dmdbms/data/jydm/FG_PERSON.DBF     |

Continue?[Y/N]:Y
restore bak_file: /dm_home/dmdba/dmdbms/data/jydm/bak/DB_jydm_20200711192046000434.bak ...
start restore database...
start restore file: /dm_home/dmdba/dmdbms/data/jydm/SYSTEM.DBF(SYSTEM), pages: 826
end restore file: /dm_home/dmdba/dmdbms/data/jydm/SYSTEM.DBF(SYSTEM)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/ROLL.DBF(ROLL), pages: 49
end restore file: /dm_home/dmdba/dmdbms/data/jydm/ROLL.DBF(ROLL)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/MAIN.DBF(MAIN), pages: 20966
end restore file: /dm_home/dmdba/dmdbms/data/jydm/MAIN.DBF(MAIN)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/BOOKSHOP.DBF(BOOKSHOP), pages: 114
end restore file: /dm_home/dmdba/dmdbms/data/jydm/BOOKSHOP.DBF(BOOKSHOP)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/DMHR.DBF(DMHR), pages: 52
end restore file: /dm_home/dmdba/dmdbms/data/jydm/DMHR.DBF(DMHR)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/users01.dbf(USERS), pages: 135
end restore file: /dm_home/dmdba/dmdbms/data/jydm/users01.dbf(USERS)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/SYSAWR.DBF(SYSAUX), pages: 13459
end restore file: /dm_home/dmdba/dmdbms/data/jydm/SYSAWR.DBF(SYSAUX)
start restore file: /dm_home/dmdba/dmdbms/data/jydm/FG_PERSON.DBF(FG_PERSON), pages: 2
end restore file: /dm_home/dmdba/dmdbms/data/jydm/FG_PERSON.DBF(FG_PERSON)
end restore database data files.

Apply archive log LSN from 27830643 to 27830642, time used:0.000s.
restore finished, code = 0!

restore successfully!
restore time used: 7144.214(ms)


例如,利用归档文件/dm_home/dmdbms/backup/arch还原数据库,这里将使用备份文件还原新的目标库
1.先将原备份库的备份文件和归档文件复制到新还原库的主机上

[dmdba@shard1 backup]$ scp  -r /dm_home/dmdba/dmdbms/data/jydm/bak/DB_jydm_20200711192046000434.bak  dmdba@10.138.130.187:/dm_home/dmdbms/backup/
dmdba@10.138.130.187's password:
DB_jydm_20200711192046000434.bak                                                                                                                                                                          100%  288MB  96.0MB/s   00:03
[dmdba@shard1 backup]$ scp  -r /dm_home/dmdba/dmdbms/data/arch  dmdba@10.138.130.187:/dm_home/dmdbms/backup/
dmdba@10.138.130.187's password:
ARCHIVE_LOCAL1_20200603195207512_0.log                                                                                                                                                                    100%   84MB  21.0MB/s   00:04
ARCHIVE_LOCAL1_20200606020009584_0.log                                                                                                                                                                    100% 6588KB   6.4MB/s   00:00
ARCHIVE_LOCAL1_20200606061513930_0.log                                                                                                                                                                    100%   24KB  24.0KB/s   00:00
ARCHIVE_LOCAL1_20200606062617837_0.log                                                                                                                                                                    100% 7168     7.0KB/s   00:00
ARCHIVE_LOCAL1_20200606062943852_0.log                                                                                                                                                                    100%  300MB 100.0MB/s   00:03
ARCHIVE_LOCAL1_20200606142842948_0.log                                                                                                                                                                    100%  300MB 100.0MB/s   00:03
ARCHIVE_LOCAL1_20200606142846352_0.log                                                                                                                                                                    100%  300MB 100.0MB/s   00:03
ARCHIVE_LOCAL1_20200606142902741_0.log                                                                                                                                                                    100%  300MB  33.3MB/s   00:09
ARCHIVE_LOCAL1_20200606142909259_0.log                                                                                                                                                                    100%  300MB 150.0MB/s   00:02
ARCHIVE_LOCAL1_20200606220653158_0.log                                                                                                                                                                    100%  300MB  50.0MB/s   00:06
ARCHIVE_LOCAL1_20200613210000757_0.log                                                                                                                                                                    100%  300MB  14.3MB/s   00:21
ARCHIVE_LOCAL1_20200617093523748_0.log                                                                                                                                                                    100%   32MB   7.9MB/s   00:04
ARCHIVE_LOCAL1_20200617161801000_0.log                                                                                                                                                                    100% 3926KB   3.8MB/s   00:00
ARCHIVE_LOCAL1_20200617170101954_0.log                                                                                                                                                                    100% 1464KB   1.4MB/s   00:00
ARCHIVE_LOCAL1_20200617173005734_0.log                                                                                                                                                                    100% 8583KB   8.4MB/s   00:01
ARCHIVE_LOCAL1_20200617190859140_0.log                                                                                                                                                                    100%   20MB  20.1MB/s   00:01
ARCHIVE_LOCAL1_20200622160035411_0.log                                                                                                                                                                    100%  220KB 220.0KB/s   00:00
ARCHIVE_LOCAL1_20200623172303743_0.log                                                                                                                                                                    100%  300MB  11.1MB/s   00:27
ARCHIVE_LOCAL1_20200624180051432_0.log                                                                                                                                                                    100%  300MB  10.7MB/s   00:28
ARCHIVE_LOCAL1_20200626193023317_0.log                                                                                                                                                                    100%  300MB  10.7MB/s   00:28
ARCHIVE_LOCAL1_20200630024319628_0.log                                                                                                                                                                    100%   47MB   9.5MB/s   00:05
ARCHIVE_LOCAL1_20200630173436447_0.log                                                                                                                                                                    100%   39MB   9.6MB/s   00:04
ARCHIVE_LOCAL1_20200706091427214_0.log                                                                                                                                                                    100%  300MB   9.7MB/s   00:31
ARCHIVE_LOCAL1_20200710110030273_0.log                                                                                                                                                                    100%  113MB   8.7MB/s   00:13
ARCHIVE_LOCAL1_20200606062454805_0.log                                                                                                                                                                    100% 7680     7.5KB/s   00:00
ARCHIVE_LOCAL1_20200606062942967_0.log                                                                                                                                                                    100% 7680     7.5KB/s   00:00
ARCHIVE_LOCAL1_20200606064235117_0.log                                                                                                                                                                    100%   16KB  15.5KB/s   00:00
ARCHIVE_LOCAL1_20200606142853068_0.log                                                                                                                                                                    100%  300MB  10.0MB/s   00:30
ARCHIVE_LOCAL1_20200606142906087_0.log                                                                                                                                                                    100%  300MB  23.1MB/s   00:13
ARCHIVE_LOCAL1_20200606142912805_0.log                                                                                                                                                                    100% 5120     5.0KB/s   00:00
ARCHIVE_LOCAL1_20200617193955110_0.log                                                                                                                                                                    100%   83MB  10.4MB/s   00:08
ARCHIVE_LOCAL1_20200622160200765_0.log                                                                                                                                                                    100%  234KB 234.0KB/s   00:00
ARCHIVE_LOCAL1_20200711193829081_0.log                                                                                                                                                                    100%  300MB  13.6MB/s   00:22
[dmdba@shard1 backup]$

[dmdba@dmks backup]$ ls -lrt

drwxr-xr-x. 2 dmdba dinstall      4096 7月  11 19:47 arch
-rw-r--r--. 1 dmdba dinstall  33554432 7月  11 19:50 DB_dmks_FULL_2020_07_11_19_50_30.bak

2.使用原备份库还原新库

[dmdba@dmks backup]$ dmrestore ini_path=/dm_home/dmdbms/data/dameng_for_recover/dm.ini file=/dm_home/dmdbms/backup/DB_jydm_20200711192046000434.bak
restore V7.1.6.46-Build(2018.02.08-89107)ENT
file dm.key not found, use default license!


backup sig:            BA
backup tool version:   12595
backup db name:        jydm
backup db magic:       -82313077
backup pemnt magic:    1250320462
backup name:           jydm
backup type:           full
backup level:          offline
backup range:          database
backup description:
compressed level:      0
encrypt_type:          0
encrypt_id:            2052
rac node:              0
page check:            0
rlog encrypt:          0
external cipher id:    0
external hash id:      0
length in char:        0
use new hash:          1
backup time:           2020-07-11 19:20:46
page size:             8 KB
extent size:           16
case sensitive:        1
log page size:         512 B
charset:               0
data version:          0x7000A
sys version:           V7.1.6.46-Build(2018.02.08-89107)ENT
enable policy:         0
mpp_timestamp:         0
crc_check:             TRUE
parallel type:         0
parallel info len:     0
backup db fil num:     8
archive flag:          1
after backup LSN:      27830642


$bak_seq |$file_path                                        |$size(K)       |$used(K)
        1|/dm_home/dmdbms/backup/DB_jydm_20200711192046000434.bak|      294912.00|      284866.00


$file_seq |$type|$ts_name       |$state    |$size(K)  |$seq_in_bak    |$off_in_bak(B) |$len_in_bak(B) |$file_path                                        |$mirror_path
         1|DBF  |SYSTEM         |ONLINE    |     23552|              1|          43008|        6766592|/dm_home/dmdba/dmdbms/data/jydm/SYSTEM.DBF        |
         2|DBF  |ROLL           |ONLINE    |    229376|              1|        6809600|         401408|/dm_home/dmdba/dmdbms/data/jydm/ROLL.DBF          |
         3|DBF  |MAIN           |ONLINE    |    210944|              1|        7211008|      171753472|/dm_home/dmdba/dmdbms/data/jydm/MAIN.DBF          |
         4|DBF  |BOOKSHOP       |ONLINE    |    153600|              1|      178964480|         933888|/dm_home/dmdba/dmdbms/data/jydm/BOOKSHOP.DBF      |
         5|DBF  |DMHR           |ONLINE    |    131072|              1|      179898368|         425984|/dm_home/dmdba/dmdbms/data/jydm/DMHR.DBF          |
         6|DBF  |USERS          |ONLINE    |     51200|              1|      180324352|        1105920|/dm_home/dmdba/dmdbms/data/jydm/users01.dbf       |
         7|DBF  |SYSAUX         |ONLINE    |    179200|              1|      181430272|      110256128|/dm_home/dmdba/dmdbms/data/jydm/SYSAWR.DBF        |
         8|DBF  |FG_PERSON      |ONLINE    |    131072|              1|      291686400|          16384|/dm_home/dmdba/dmdbms/data/jydm/FG_PERSON.DBF     |

Continue?[Y/N]:Y
Warning: Backup file may has been modified !

Continue?[Y/N]:Y
restore bak_file: /dm_home/dmdbms/backup/DB_jydm_20200711192046000434.bak ...
start restore database...
start restore file: /dm_home/dmdbms/data/dameng_for_recover/SYSTEM.DBF(SYSTEM), pages: 826
end restore file: /dm_home/dmdbms/data/dameng_for_recover/SYSTEM.DBF(SYSTEM)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/ROLL.DBF(ROLL), pages: 49
end restore file: /dm_home/dmdbms/data/dameng_for_recover/ROLL.DBF(ROLL)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/MAIN.DBF(MAIN), pages: 20966
end restore file: /dm_home/dmdbms/data/dameng_for_recover/MAIN.DBF(MAIN)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/BOOKSHOP.DBF(BOOKSHOP), pages: 114
end restore file: /dm_home/dmdbms/data/dameng_for_recover/BOOKSHOP.DBF(BOOKSHOP)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/DMHR.DBF(DMHR), pages: 52
end restore file: /dm_home/dmdbms/data/dameng_for_recover/DMHR.DBF(DMHR)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/users01.dbf(USERS), pages: 135
end restore file: /dm_home/dmdbms/data/dameng_for_recover/users01.dbf(USERS)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/SYSAWR.DBF(SYSAUX), pages: 13459
end restore file: /dm_home/dmdbms/data/dameng_for_recover/SYSAWR.DBF(SYSAUX)
start restore file: /dm_home/dmdbms/data/dameng_for_recover/FG_PERSON.DBF(FG_PERSON), pages: 2
end restore file: /dm_home/dmdbms/data/dameng_for_recover/FG_PERSON.DBF(FG_PERSON)
end restore database data files.

Apply archive log LSN from 27830643 to 27830642, time used:0.000s.
restore finished, code = 0!

restore successfully!
restore time used: 44867.245(ms)

使用备份文件还原数据库归档日志LSN为27830643
3.使用dmmdbf工具查看原备份库中的db_magic为1371967312

[dmdba@shard1 backup]$ dmmdf type=1 file=/dm_home/dmdba/dmdbms/data/jydm/SYSTEM.DBF
dmmdf V7.1.6.46-Build(2018.02.08-89107)ENT
**********************************************************
1 db_magic=1371967312
2 next_trxid=3377415
3 pemnt_magic=1250320462
**********************************************************
Please input which parameter you want to change(1-3), q to quit: q
<?pre>
4.使用dmmdf工具查看目标库的system.dbf的db_magic并进行修改1371967312
[dmdba@dmks dameng_for_recover]$ dmmdf type=1 file=/dm_home/dmdbms/data/dameng_for_recover/SYSTEM.DBF
dmmdf V7.1.6.46-Build(2018.02.08-89107)ENT
**********************************************************
1 db_magic=-82313077
2 next_trxid=3377415
3 pemnt_magic=1250320462
**********************************************************
Please input which parameter you want to change(1-3), q to quit: 1
Please input new value: 1371967312
**********************************************************
1 db_magic=1371967312
2 next_trxid=3377415
3 pemnt_magic=1250320462
**********************************************************
Do you want to save the change to file (y/n): y
Save to file success!

5.使用dmmdf工具查看目标库的dameng_for_recover01.log和dameng_for_recover02.log的db_magic并进行修改-82313077

[dmdba@dmks dameng_for_recover]$ dmmdf type=2 file=/dm_home/dmdbms/data/dameng_for_recover/dameng_for_recover01.log
dmmdf V7.1.6.46-Build(2018.02.08-89107)ENT
**********************************************************
1 sig = DMRLOG
2 ver = 7004
3 chksum = 0
4 dbversion = 0x7000a
5 sta = 0
6 n_magic = 35
7 db_magic = -82313077
8 clsn_fil = 0
10 next_seq = 304
11 arch_seq = 0
12 len = 268435456
13 free = 4096
14 clsn = 27830642
15 clsn_off = 4096
16 arch_lsn = 0
17 pemnt_magic = 1250320462
18 fil_id = 0
19 crc_check = 1
**********************************************************
You can only reset sta(5) or db_magic (7) or clsn (14) or pemnt_magic(17) or fil_id(18).
Please input the num which one you want to change, q to quit: 7
Input the new value: 1371967312
**********************************************************
1 sig = DMRLOG
2 ver = 7004
3 chksum = 0
4 dbversion = 0x7000a
5 sta = 0
6 n_magic = 35
7 db_magic = 1371967312
8 clsn_fil = 0
10 next_seq = 304
11 arch_seq = 0
12 len = 268435456
13 free = 4096
14 clsn = 27830642
15 clsn_off = 4096
16 arch_lsn = 0
17 pemnt_magic = 1250320462
18 fil_id = 0
19 crc_check = 1
**********************************************************
Do you want to quit and save the change to file (y/n): y
Save to file success!
[dmdba@dmks dameng_for_recover]$ dmmdf type=2 file=/dm_home/dmdbms/data/dameng_for_recover/dameng_for_recover02.log
dmmdf V7.1.6.46-Build(2018.02.08-89107)ENT
**********************************************************
1 sig = DMRLOG
2 ver = 7004
3 chksum = 0
4 dbversion = 0x7000a
5 sta = 0
6 n_magic = 35
7 db_magic = -82313077
8 clsn_fil = 0
10 next_seq = 0
11 arch_seq = 0
12 len = 268435456
13 free = 4096
14 clsn = 0
15 clsn_off = 0
16 arch_lsn = 0
17 pemnt_magic = 1250320462
18 fil_id = 1
19 crc_check = 1
**********************************************************
You can only reset sta(5) or db_magic (7) or clsn (14) or pemnt_magic(17) or fil_id(18).
Please input the num which one you want to change, q to quit: 7
Input the new value: 1371967312
**********************************************************
1 sig = DMRLOG
2 ver = 7004
3 chksum = 0
4 dbversion = 0x7000a
5 sta = 0
6 n_magic = 35
7 db_magic = 1371967312
8 clsn_fil = 0
10 next_seq = 0
11 arch_seq = 0
12 len = 268435456
13 free = 4096
14 clsn = 0
15 clsn_off = 0
16 arch_lsn = 0
17 pemnt_magic = 1250320462
18 fil_id = 1
19 crc_check = 1
**********************************************************
Do you want to quit and save the change to file (y/n): y
Save to file success!

6.使用归档文件还原数据库

[dmdba@dmks backup]$ dmrestore ini_path=/dm_home/dmdbms/data/dameng_for_recover/dm.ini archive_dir=(/dm_home/dmdbms/backup/arch) show_bak_info=2
-bash: syntax error near unexpected token `('

[dmdba@dmks backup]$ dmrestore ini_path=/dm_home/dmdbms/data/dameng_for_recover/dm.ini archive_dir=\(/dm_home/dmdbms/backup/arch\) show_bak_info=2
restore V7.1.6.46-Build(2018.02.08-89107)ENT
file dm.key not found, use default license!

Continue?[Y/N]:Y
try to apply archive log from LSN: 27830642 to LSN: 9223372036854775807.

Apply archive log LSN from 27830643 to 27832982, time used:2.811s.

restore successfully!
restore time used: 3840.401(ms)
[dmdba@dmks backup]$

使用归档文件还原数据库归档日志LSN从27830643(因为使用数据库备份文件还原数据库时LSN27830643)为应用到了27832982。

7.启动恢复目标库

[root@dmks init.d]# service DmServicedmrc start
Starting DmServicedmrc: [ OK ]

[dmdba@dmks dameng_for_recover]$ cat dm.ini | grep PORT_NUM
                PORT_NUM                        =  5336                 #Port number on which the database server will listen
                DCP_PORT_NUM                    =  5237                 #Port number on which DCP will listen
[dmdba@dmks dameng_for_recover]$ disql sysdba/xxzx7817600@localhost:5336

Server[localhost:5336]:mode is normal, state is open
login used time: 19.135(ms)
disql V7.1.6.46-Build(2018.02.08-89107)ENT
Connected to: DM 7.1.6.46
SQL> select * from t1;

LINEID     C1          C2
---------- ----------- -----------
1          1           1
2          2           2
3          3           3
4          4           4
5          5           5

used time: 1.767(ms). Execute id is 4.
SQL> select * from t1;

LINEID     C1          C2
---------- ----------- -----------
1          1           1
2          2           2
3          3           3
4          4           4
5          5           5

used time: 16.368(ms). Execute id is 4733.

原库

SQL> select * from t1;

LINEID     C1          C2
---------- ----------- -----------
1          1           1
2          2           2
3          3           3
4          4           4
5          5           5

used time: 16.368(ms). Execute id is 4733.
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