Oracle 当前redo 损坏恢复

Posted 2022-02-23 刘枫_Leo

测试一 insert

会话1

/*创建数据*/sqlplus scott/scott   
create table t6 (id int,name varchar2(100));
beginfor i in 1 .. 50000 
loop
insert into t6 values(i,AAAAAA);
end loop;
commit;
end;
/
begin for i in 1 .. 50000
loop
insert into t6 values(i,AAAAAA);
end loop;
end;
/

SQL> select count(*) from t6;  
COUNT(*)
----------  
100000

会话2

/*破坏redo文件*/
sqlplus / as sysdba
SQL> select group#,status from v$log;

    GROUP# STATUS
---------- ----------------
         1 CURRENT
         2 UNUSED
         3 UNUSED

[oracle@slave prod]$ dd if=/dev/null of=/u01/app/oracle/oradata/prod/redo01.log bs=512 count=10
记录了0+0 的读入
记录了0+0 的写出
0字节(0 B)已复制，0.000111934 秒，0.0 kB/秒

[oracle@slave prod]$ sqlplus / as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> alter system switch logfile;
alter system switch logfile
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 4449
Session ID: 38 Serial number: 5

alert 日志

Tue Feb 22 11:05:27 2022
Thread 1 cannot allocate new log, sequence 2
Private strand flush not complete
  Current log# 1 seq# 1 mem# 0: /u01/app/oracle/oradata/prod/redo01.log
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_lgwr_4313.trc:
ORA-00320: cannot read file header from log 1 of thread 1
ORA-00312: online log 1 thread 1: /u01/app/oracle/oradata/prod/redo01.log
ORA-27072: File I/O error
Additional information: 4
Additional information: 1
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_lgwr_4313.trc:
ORA-00320: cannot read file header from log 1 of thread 1
ORA-00312: online log 1 thread 1: /u01/app/oracle/oradata/prod/redo01.log
ORA-27072: File I/O error
Additional information: 4
Additional information: 1

不完全恢复

一. 启动
SQL> startup mount;

日志alert
Thread 1 cannot allocate new log, sequence 2
Private strand flush not complete
  Current log# 1 seq# 1 mem# 0: /u01/app/oracle/oradata/prod/redo01.log
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_lgwr_4313.trc:
ORA-00320: cannot read file header from log 1 of thread 1
ORA-00312: online log 1 thread 1: /u01/app/oracle/oradata/prod/redo01.log
ORA-27072: File I/O error
Additional information: 4

二. 不完全恢复
SQL> recover database until cancel;
auto

三. 隐含参数
*._allow_resetlogs_corruption=TRUE
*._allow_error_simulation=TRUE

四. 启动
SQL> startup mount pfile =/u01/backup/pfile.ora;
SQL> alter database open resetlogs;

五. 查看数据
SQL> select count(*) from Scott.t6;
  COUNT(*)
----------
     50000

测试二 delete

会话1

/*创建数据*/
SQL> select count(*) from t6;
  COUNT(*)
----------
     50000

SQL>  delete from t6 where rownum <10000;
9999 rows deleted.

SQL>  select count(*) from t6;
  COUNT(*)
----------
     40001

SQL> commit;
Commit complete.

会话2

/*破坏redo文件*/
一 SQL> select group#,status from v$log;
    GROUP# STATUS
---------- ----------------
         1 INACTIVE
         2 CURRENT
         3 INACTIVE

[oracle@slave prod]$ dd if=/dev/null of=/u01/app/oracle/oradata/prod/redo02.log bs=512 count=10
记录了0+0 的读入
记录了0+0 的写出
0字节(0 B)已复制，0.000118987 秒，0.0 kB/秒

SQL> shutdown immediate
ORA-03113: end-of-file on communication channel
Process ID: 7852
Session ID: 28 Serial number: 23

/*恢复操作*/

SQL> startup mount;
ORACLE instance started.
Total System Global Area 1202556928 bytes
Fixed Size                  2252704 bytes
Variable Size             771752032 bytes
Database Buffers          419430400 bytes
Redo Buffers                9121792 bytes
Database mounted.

SQL> recover database until cancel;
ORA-00279: change 1104809 generated at 02/22/2022 11:45:33 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/fast_recovery_area/PROD/archivelog/2022_02_22/o1_mf_1_5_%u_.arc
ORA-00280: change 1104809 for thread 1 is in sequence #5
Specify log: <RET>=suggested | filename | AUTO | CANCEL
auto

SQL> 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/prod/system01.dbf

SQL> shutdown abort;

SQL> startup mount pfile=/u01/backup/pfile.ora;
ORACLE instance started.
Total System Global Area 1202556928 bytes
Fixed Size                  2252704 bytes
Variable Size             771752032 bytes
Database Buffers          419430400 bytes
Redo Buffers                9121792 bytes
Database mounted.

SQL> alter database open resetlogs
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00600: internal error code, arguments: [2662], [0], [1104816], [0],
[1105040], [4194432], [], [], [], [], [], []
Process ID: 8037
Session ID: 1 Serial number: 5

SQL>  alter session set events 10015 trace name adjust_scn level 1
SQL>  alter database open;

open resetlogs 报错

SQL> alter database open resetlogs
  2  ;
alter database open resetlogs
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00600: internal error code, arguments: [2662], [0], [1104816], [0],
[1105040], [4194432], [], [], [], [], [], []
Process ID: 8037
Session ID: 1 Serial number: 5

alert 日志

日志 alert

Mon Feb 21 22:32:21 2022
SMON: enabling cache recovery
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_ora_5021.trc  (incident=9753):
ORA-00600: internal error code, arguments: [2662], [0], [1027755], [0], [1029748], [4194432], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/prod/prod/incident/incdir_9753/prod_ora_5021_i9753.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_ora_5021.trc:
ORA-00600: internal error code, arguments: [2662], [0], [1027755], [0], [1029748], [4194432], [], [], [], [], [], []
Errors in file /u01/app/oracle/diag/rdbms/prod/prod/trace/prod_ora_5021.trc:
ORA-00600: internal error code, arguments: [2662], [0], [1027755], [0], [1029748], [4194432], [], [], [], [], [], []
Error 600 happened during db open, shutting down database
USER (ospid: 5021): terminating the instance due to error 600
Instance terminated by USER, pid = 5021
ORA-1092 signalled during:  alter database open resetlogs...
opiodr aborting process unknown ospid (5021) as a result of ORA-1092
Mon Feb 21 22:32:23 2022

解释：
ORA-600 [2662] "Block SCN is ahead of Current SCN"，说明当前数据库的数据块的SCN早于当前的SCN，主要是和存储在UGA变量中的dependent SCN进行比较，如果当前的SCN小于它，数据库就会产生这个ORA-600 [2662]的错误了。这个错误一共有五个参数，分别代表不同的含义，
ORA-600 [2662] [a] [b] [c] [d] [e]
Arg [a] Current SCN WRAP
Arg [b] Current SCN BASE
Arg [c] dependent SCN WRAP
Arg [d] dependent SCN BASE
Arg [e] Where present this is the DBA where the dependent SCN came from.
当前的报错是当前的SCN=1027755 小于dependent SCN4194432！

恢复后建议导出导入一次。
参考blog

https://www.xifenfei.com/2011/12/%e5%bc%82%e5%b8%b8%e6%96%ad%e7%94%b5%e5%af%bc%e8%87%b4current-redo%e6%8d%9f%e5%9d%8f%e5%a4%84%e7%90%86.html
https://developer.aliyun.com/article/27940
https://blog.csdn.net/zhengwei125/article/details/50432605