在一次数据库实例重启的过程中，数据库启动失败，报如下的错误

[dmdba@dsc3 bin]$ ./DmServiceDMSERVER restart

Stopping DmServiceDMSERVER:                                [ OK ]
Starting DmServiceDMSERVER:                                [ FAILED ]
file dm.key not found, use default license!
version info: develop
DM Database Server x64 V8 1-2-38-21.07.09-143359-10018-ENT  startup...
Normal of FAST
Normal of DEFAULT
Normal of RECYCLE
Normal of KEEP
Normal of ROLL
Database mode = 0, oguid = 0
License will expire on 2022-07-09
rfil grp init log file /d|  |


mdata/DAMENG/DAMENG01.log error, code = -717

在初步诊断后，发现日志文件DAMENG01.log损坏。

处理过程

重新初始化一个新的数据库，初始化参数要和原库一样，比如页大小、大小写敏感、字符集等。
查看初始化数据库时产生的日志

[dmdba@dsc3 DAMENG.bak]$ cat dminit20211107224222.log

start init database: V8, 2021-11-07 22:42:22
init params:
        db path: /dmdata/DAMENG
        db name: DAMENG
        auto overwrite: 0
        page size: 32768
        extent size: 16
        time zone: +08:00
        string case sensitive: 1
        charset: 1
        length in char: 1
        page check mode: 0
        priv flag: 0
        rlog enc flag: 0
        use new hash: 1
        blank pad mode: 0
        sec priv mode: 0
        huge with delta: 1
        rlog gen for huge: 0
        pseg_mgr_flag: 0
        char_fix_storage: 0
        sql_log_forbid: 0
        secur_flag: 2

 log file path: /dmdata/DAMENG/DAMENG01.log


 log file path: /dmdata/DAMENG/DAMENG02.log

create ini file /dmdata/DAMENG/dm.ini success.

create rlog file /dmdata/DAMENG/DAMENG01.log success.

create rlog file /dmdata/DAMENG/DAMENG02.log success.

SYSTEM file : /dmdata/DAMENG/SYSTEM.DBF

MAIN file : /dmdata/DAMENG/MAIN.DBF

ROLL file : /dmdata/DAMENG/ROLL.DBF

create dm database success. 2021-11-07 22:42:25

查看原数据库的魔数
[dmdba@dsc3 bin]$ ./dmmdf TYPE=1 FILE=/dmdata/DAMENG/SYSTEM.DBF

dmmdf V8
**********************************************************
**1 db_magic=1502558514**
2 next_trxid=5040
3 pemnt_magic=429000718
**********************************************************
Please input which parameter you want to change(1-3), q to quit: 

将原数据库备份后，初始化新的数据库
[dmdba@dsc3 bin]$ ./dminit path=/dmdata PAGE_SIZE=32 EXTENT_SIZE=16

CHARSET=1
initdb V8
db version: 0x7000c
file dm.key not found, use default license!
License will expire on 2022-07-09
Normal of FAST
Normal of DEFAULT
Normal of RECYCLE
Normal of KEEP
Normal of ROLL

 log file path: /dmdata/DAMENG/DAMENG01.log


 log file path: /dmdata/DAMENG/DAMENG02.log

write to dir [/dmdata/DAMENG].
create dm database success. 2021-11-09 10:52:54

将新生产的DAMENG01.log复制到原库的目录下
[dmdba@dsc3 DAMENG]$ cp DAMENG01.log …/DAMENG.bak/

使用 dmmdf 工具设置 DAMENG01.log 文件的 db_magic，设置为步骤 中记录的值。

[dmdba@dsc3 bin]$ ./dmmdf TYPE=2 FILE=/dmdata/DAMENG/DAMENG01.log

dmmdf V8
**********************************************************
1 sig = DMRLOG
2 ver = 7006
3 chksum = 145635124
4 sta = 1
5 n_magic = 7
6 **db_magic = 121732074**
7 len = 268435456
8 free = 7222784
9 clsn = 33282
10 clsn_fil = 0
11 clsn_off = 7222784
12 pemnt_magic = 429000718
13 fil_id = 0
15 next_seq = 3622
16 g_next_seq = 3622
17 arch_lsn = 0
18 arch_seq = 0
19 dbversion = 0x7000c
20 min_exec_version = V8.1.1.1
21 min_dct_version  = 4
22 p_db_magic = 0
23 n_apply_ep = 0
24 apply_info_lsn = 0
   pkg_seq_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
   apply_lsn_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
25 recv_p_db_magic = 0
26 recv_n_apply_ep = 0
   recv_pkg_seq_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
   recv_apply_lsn_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
**********************************************************
You can only reset sta(4) or db_magic (6) or clsn (9) or clsn_fil(10) or clsn_off(11) or pemnt_magic(12) or fil_id(13) or next_seq(15) or g_next_seq(16) or p_db_magic(20) or n_apply_ep(21).
**Please input the num which one you want to change, q to quit: 6** 
**Input the new value: 1502558514**
**********************************************************
1 sig = DMRLOG
2 ver = 7006
3 chksum = 1449162220
4 sta = 1
5 n_magic = 7
6 db_magic = 1502558514
7 len = 268435456
8 free = 7222784
9 clsn = 33282
10 clsn_fil = 0
11 clsn_off = 7222784
12 pemnt_magic = 429000718
13 fil_id = 0
15 next_seq = 3622
16 g_next_seq = 3622
17 arch_lsn = 0
18 arch_seq = 0
19 dbversion = 0x7000c
20 min_exec_version = V8.1.1.1
21 min_dct_version  = 4
22 p_db_magic = 0
23 n_apply_ep = 0
24 apply_info_lsn = 0
   pkg_seq_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
   apply_lsn_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
25 recv_p_db_magic = 0
26 recv_n_apply_ep = 0
   recv_pkg_seq_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
   recv_apply_lsn_arr: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
**********************************************************
Do you want to quit and save the change to file (y/n): y
Save to file success!
[dmdba@dsc3 bin]$ 

修改魔数成功后，重启数据库服务
[dmdba@dsc3 bin]$ ./DmServiceDMSERVER start

Starting DmServiceDMSERVER:                                [ OK ]

数据库启动成功

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