标签归档：达梦redo丢失

通过模拟事务不提交,并删除掉redo来模仿达梦数据库故障的恢复过程
模拟达梦事务并不提交直接abort掉库

[dmdba@xifenfei ~]$ disql SYSDBA/Oracle123@localhost:5236

Server[localhost:5236]:mode is normal, state is open
login used time : 5.575(ms)
disql V8
SQL> 
SQL> create table t1 as select * from dba_objects;
executed successfully
used time: 85.929(ms). Execute id is 601.
SQL> select count(1) from t1;

LINEID     COUNT(1)            
---------- --------------------
1          1067

used time: 2.106(ms). Execute id is 602.
SQL> delete from t1;
affect rows 1067

used time: 3.726(ms). Execute id is 603.
SQL> shutdown abort;
executed successfully
used time: 1.324(ms). Execute id is 0.

删除掉redo文件

[dmdba@xifenfei ~]$ cd /dmdb/data/DAMENG/
[dmdba@xifenfei DAMENG]$ rm -rf DAMENG0
DAMENG01.log  DAMENG02.log  
[dmdba@xifenfei DAMENG]$ rm -rf DAMENG0*.log

尝试启动达梦数据库

[dmdba@xifenfei bin]$ ./dmserver  /dmdb/data/DAMENG/dm.ini 
file dm.key not found, use default license!
version info: develop
csek2_vm_t = 9456
nsql_vm_t = 336
prjt2_vm_t = 176
ltid_vm_t = 272
nins2_vm_t = 1144
nset2_vm_t = 272
ndlck_vm_t = 192
ndel2_vm_t = 760
slct2_vm_t = 352
nli2_vm_t = 200
aagr2_vm_t = 312
pscn_vm_t = 416
dist_vm_t = 1000
DM Database Server 64 V8 03134284458-20251113-301923-20178 startup...
Normal of FAST
Normal of DEFAULT
Normal of RECYCLE
Normal of KEEP
Normal of ROLL
Database mode = 0, oguid = 0
/dmdb/data/DAMENG/DAMENG01.log not exist, can not startup

重命名现在的库文件,然后参考当时的创建库的init.log 进行重新初始化一个新库

[dmdba@xifenfei data]$ cat DAMENG_BAK/dminit_DAMENG_20260315093214.log 
start init database: V8, 2026-03-15 09:32:14
init params:
        db path: /dmdb/data/DAMENG
        db name: DAMENG
        auto overwrite: 0
        page size: 8192
        extent size: 16
        char_fix_storage: 0
        sql_log_forbid: 0
        secur_flag: 2
        enable mac: 0
        page checksum policy: 1
        time zone: +08:00
        string case sensitive: 1
        charset: 0
        page check mode: 3
        page check algorithm id: 0
        priv flag: 0
        env label: 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: 1
        pseg_mgr_flag: 0
        auto_adj_para: 0

[dmdba@xifenfei data]$ dminit PATH=/dmdb/data/DAMENG  PAGE_SIZE=8 EXTENT_SIZE=16 
> LOG_SIZE=256 PORT_NUM=5236 CASE_SENSITIVE=Y CHARSET=0 DB_NAME=DAMENG INSTANCE_NAME=DMSERVER
> SYSDBA_PWD=Oracle123 SYSAUDITOR_PWD=Oracle123 RLOG_POSTFIX_NAME=log
initdb V8
db version: 0x7000d
file dm.key not found, use default license!
License will expire on 2026-11-13
Normal of FAST
Normal of DEFAULT
Normal of RECYCLE
Normal of KEEP
Normal of ROLL

 log file path: /dmdb/data/DAMENG/DAMENG/DAMENG01.log


 log file path: /dmdb/data/DAMENG/DAMENG/DAMENG02.log

write to dir [/dmdb/data/DAMENG/DAMENG].
create dm database success. 2026-06-27 23:40:17

正常启动这个新库并干净关闭

[dmdba@xifenfei bin]$ disql SYSDBA/Oracle123@localhost:5236

Server[localhost:5236]:mode is normal, state is open
login used time : 5.523(ms)
disql V8
SQL> shutdown normal
2   ;
executed successfully
used time: 1.417(ms). Execute id is 0.
SQL> 

直接拷贝redo文件替换尝试启动

[dmdba@xifenfei bin]$ ./dmserver  /dmdb/data/DAMENG/dm.ini 
file dm.key not found, use default license!
version info: develop
csek2_vm_t = 9456
nsql_vm_t = 336
prjt2_vm_t = 176
ltid_vm_t = 272
nins2_vm_t = 1144
nset2_vm_t = 272
ndlck_vm_t = 192
ndel2_vm_t = 760
slct2_vm_t = 352
nli2_vm_t = 200
aagr2_vm_t = 312
pscn_vm_t = 416
dist_vm_t = 1000
DM Database Server 64 V8 03134284458-20251113-301923-20178 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 2026-11-13
rfil grp log file error in (db_magic, permanent_magic), 
        log file /dmdb/data/DAMENG/DAMENG01.log is (475644558, 854749702), 
        dbfile is(92637567, 1763199417).
Floating point exception
[dmdba@xifenfei bin]$ 

提示db_magic和permanent_magic不匹配,使用dmmdf修改新库redo文件

[dmdba@xifenfei DAMENG]$ dmmdf type=1 FILE=SYSTEM.DBF
dmmdf V8
**********************************************************
1 db_magic=92637567
2 next_trxid=38064
3 pemnt_magic=1763199417
4 enable_page_check=3
**********************************************************
Please input which parameter you want to change(1-4), q to quit: Q

然后在使用dmmdf type=2 修改redo文件的db_magic和pemnt_magic修改之后,设置PSEG_RECV = 0，RLOG_CHECK_SPACE = 2尝试启动库

[dmdba@xifenfei bin]$ ./dmserver  /dmdb/data/DAMENG/dm.ini
file dm.key not found, use default license!
version info: develop
csek2_vm_t = 9456
nsql_vm_t = 336
prjt2_vm_t = 176
ltid_vm_t = 272
nins2_vm_t = 1144
nset2_vm_t = 272
ndlck_vm_t = 192
ndel2_vm_t = 760
slct2_vm_t = 352
nli2_vm_t = 200
aagr2_vm_t = 312
pscn_vm_t = 416
dist_vm_t = 1000
DM Database Server 64 V8 03134284458-20251113-301923-20178 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 2026-11-13
file lsn: 49136
ndct db load finished, code:100
ndct fill fast pool finished
pseg_set_gtv_trxid_low next_trxid in mem:[40065]
pseg recv finished
nsvr_startup end.
uthr_pipe_create, create pipe[read:10, write:11]
uthr_pipe_create, create pipe[read:12, write:13]
uthr_pipe_create, create pipe[read:14, write:15]
uthr_pipe_create, create pipe[read:16, write:17]
uthr_pipe_create, create pipe[read:18, write:19]
uthr_pipe_create, create pipe[read:20, write:21]
uthr_pipe_create, create pipe[read:22, write:23]
uthr_pipe_create, create pipe[read:24, write:25]
uthr_pipe_create, create pipe[read:26, write:27]
uthr_pipe_create, create pipe[read:28, write:29]
uthr_pipe_create, create pipe[read:30, write:31]
uthr_pipe_create, create pipe[read:32, write:33]
uthr_pipe_create, create pipe[read:34, write:35]
uthr_pipe_create, create pipe[read:36, write:37]
uthr_pipe_create, create pipe[read:38, write:39]
uthr_pipe_create, create pipe[read:40, write:41]
aud sys init success.
aud rt sys init success.
systables desc init success.
ndct_db_load_info finished, code:100.
nsvr_process_before_open begin.
nsvr_process_before_open success.
SYSTEM IS READY.

查询拉起来库中的数据

[dmdba@xifenfei DAMENG]$ disql SYSDBA/Oracle123@localhost:5236

Server[localhost:5236]:mode is normal, state is open
login used time : 6.192(ms)
disql V8
SQL> select count(1) from t1;

LINEID     COUNT(1)            
---------- --------------------
1          1067

used time: 8.976(ms). Execute id is 601.
SQL>