07 归档模式 Active redo log丢失或损坏的恢复

环境同上一篇

模拟处于active状态的redo log损坏

sesion 1

SYS@ orcl >/                         

    GROUP#    THREAD#  SEQUENCE#      BYTES  BLOCKSIZE      MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
     1        1          19   52428800       512        2 NO  CURRENT             9777054 06-JUN-19     2.8147E+14
     2        1          17   52428800       512        1 YES ACTIVE             9776201 06-JUN-19        9776627 06-JUN-19
     3        1          18   52428800       512        1 YES ACTIVE             9776627 06-JUN-19        9777054 06-JUN-19

session 2

[oracle@DSI ~]$ sqlplus test/test
SQL> create table t7 (id int,name varchar2(100));
Table created.

SQL> begin
for i in 1 .. 50000000
loop
insert into t7 values(i,'AAAAAA');
end loop;
commit;
end;
/  

session 1

SYS@ orcl >shutdown abort;
ORACLE instance shut down.

session 2 报错

/  2    3    4    5    6    7    8
begin
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 6269
Session ID: 141 Serial number: 527

SQL> conn /as sysdba
Connected to an idle instance.

SQL> startup mount;
ORACLE instance started.

Total System Global Area  784998400 bytes
Fixed Size            2257352 bytes
Variable Size          478154296 bytes
Database Buffers      297795584 bytes
Redo Buffers            6791168 bytes
Database mounted.
SQL> set linesize 1000
SQL> select * from v$log;

    GROUP#    THREAD#  SEQUENCE#      BYTES  BLOCKSIZE      MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
     1        1          19   52428800       512        2 YES ACTIVE             9777054 06-JUN-19        9777480 06-JUN-19
     3        1          18   52428800       512        1 YES ACTIVE             9776627 06-JUN-19        9777054 06-JUN-19
     2        1          20   52428800       512        1 NO  CURRENT             9777480 06-JUN-19     2.8147E+14

SQL> select * from v$logfile;

    GROUP# STATUS  TYPE    MEMBER                       IS_
---------- ------- ------- ---------------------------------------------------------------- ---
     2       ONLINE  /u01/app/oracle/oradata/orcl/redo02.log        NO
     1       ONLINE  /u01/app/oracle/oradata/orcl/redo01.log        NO
     3       ONLINE  /u01/app/oracle/oradata/orcl/redo03.log        NO
     1       ONLINE  /u01/app/oracle/oradata/orcl/redo11.log    

损坏active的3号文件

[oracle@DSI ~]$ dd if=/dev/null of=/u01/app/oracle/oradata/orcl/redo03.log bs=512 count=20
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000121828 s, 0.0 kB/s

打开报错

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/u01/app/oracle/oradata/orcl/redo03.log'
ORA-27047: unable to read the header block of file
Linux-x86_64 Error: 25: Inappropriate ioctl for device
Additional information: 1
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery

SQL> recover database until cancel;
ORA-00279: change 9776627 generated at 06/06/2019 09:25:59 needed for thread 1
ORA-00289: suggestion : /u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_18_ghjtxbjq_.arc
ORA-00280: change 9776627 for thread 1 is in sequence #18

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

ORA-00279: change 9777054 generated at 06/06/2019 09:26:02 needed for thread 1
ORA-00289: suggestion : /u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_19_ghjtxfjt_.arc
ORA-00280: change 9777054 for thread 1 is in sequence #19
ORA-00278: log file '/u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_18_ghjtxbjq_.arc' no longer needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

ORA-00279: change 9777480 generated at 06/06/2019 09:26:05 needed for thread 1
ORA-00289: suggestion : /u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_20_%u_.arc
ORA-00280: change 9777480 for thread 1 is in sequence #20
ORA-00278: log file '/u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_19_ghjtxfjt_.arc' no longer needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

ORA-00308: cannot open archived log '/u01/app/oracle/fra/ORCL/archivelog/2019_06_06/o1_mf_1_20_%u_.arc'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3

ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/u01/app/oracle/oradata/orcl/system01.dbf'

SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/u01/app/oracle/oradata/orcl/system01.dbf'
[oracle@DSI ~]$ tail -n 100 /tmp/pfile.ora

修改隐含参数

*._allow_resetlogs_corruption=true
*._allow_error_simulation=true

[oracle@DSI ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Jun 6 09:32:52 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup pfile='/tmp/pfile.ora' mount;
ORACLE instance started.

Total System Global Area  784998400 bytes
Fixed Size            2257352 bytes
Variable Size          478154296 bytes
Database Buffers      297795584 bytes
Redo Buffers            6791168 bytes
Database mounted.
SQL> alter database open resetlogs;

Database altered.
SQL> select * from v$log;

    GROUP#    THREAD#  SEQUENCE#      BYTES  BLOCKSIZE      MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ ---------
     1        1           1   52428800       512        2 YES ACTIVE             9777481 06-JUN-19        9778409 06-JUN-19
     2        1           2   52428800       512        1 YES ACTIVE             9778409 06-JUN-19        9778925 06-JUN-19
     3        1           3   52428800       512        1 NO  CURRENT             9778925 06-JUN-19     2.8147E+14
SQL> alter system switch logfile;

System altered.

SQL> /

System altered.

SQL> /

System altered.
SQL> select * from test.t7;

no rows selected

查看错误日志
[oracle@DSI ~]$ tail -f -n 100 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.log
##处于active/current redo log损坏，进行强制启动打开的话，比较小的库最好是进行导出导出，防止出现其他错误，比较大的库（上百t）迁移的时间就比较长
如果有报错，有些可能修复，有些不能修复的致命错误比如ora-600等，还是导出导入修复比较安全