一次恢复DB的过程：试用隐含参数_allow_resetlogs_corruption和重建undo tablespace

问题：

某个现场做数据库恢复的时侯有一个问题：DB恢复需要这个归档日志文件1_33160.dbf，但是在备份中没有。

SQL> recover database using backup controlfile until cancel;

ORA-00279: change 4207433305 generated at 04/23/2008 02:00:33 needed for thread 1

ORA-00289: suggestion :

/opt/oracle/db02/app/oracle/oradata/ORCL/archive/1_33160.dbf

ORA-00280: change 4207433305 for thread 1 is in sequence #33160


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


ORA-00308: cannot open archived log

'/opt/oracle/db02/app/oracle/oradata/ORCL/archive/1_33160.dbf'

ORA-27037: unable to obtain file status

SVR4 Error: 2: No such file or directory

Additional information: 3


ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below

ORA-01195: online backup of file 1 needs more recovery to be consistent

ORA-01110: data file 1: '/opt/oracle/db02/app/oracle/oradata/ORCL/system01.dbf'



解决过程：

SunOS 5.8

login: oracle
Password:
Last login: Sun May 4 10:39:57 from 172.19.136.49
Sun Microsystems Inc. SunOS 5.8 Generic Patch February 2004
$ ls
db01 db02 db03 db04 lost+found
$ sqlplus '/as sysdba'

SQL*Plus: Release 9.2.0.4.0 - Production on Sun May 4 11:49:10 2008

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production

SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /opt/oracle/db02/app/oracle/oradata/ORCL/archive
Oldest online log sequence 33159
Next log sequence to archive 33161
Current log sequence 33161
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open


SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01195: online backup of file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/opt/oracle/db02/app/oracle/oradata/ORCL/system01.dbf'

resetlogs的字面意思是重置重做日志。在创建控制文件的时候如果不需要在线重做日志的话可以用resetlogs选项，第二种情况是在做不完全恢复后，数据文件和重做日志的内容不同步了，这个时候打开数据库一定要用resetlogs选项。resetlogs 的时候数据库其实做了很多事，最主要的还是清空重做日志的内容，选定一个重做日志作为当前日志并将日志序列号重置为1，把resetlogs count和resetlogs scn写入控制文件、数据文件头部和重做日志的头部，当然还会做很多其它的事情。

SQL> shutdown immediate
ORA-01109: database not open


Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.

尝试一下基于时间点的不完全恢复：

SQL> recover database using backup controlfile until time '2008-04-30 01:00:00';
ORA-00279: change 4207433305 generated at 04/23/2008 02:00:33 needed for thread 1
ORA-00289: suggestion :
/opt/oracle/db02/app/oracle/oradata/ORCL/archive/1_33160.dbf
ORA-00280: change 4207433305 for thread 1 is in sequence #33160


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

ORA-00308: cannot open archived log
'/opt/oracle/db02/app/oracle/oradata/ORCL/archive/1_33160.dbf'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3


ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01195: online backup of file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/opt/oracle/db02/app/oracle/oradata/ORCL/system01.dbf'


SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01195: online backup of file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/opt/oracle/db02/app/oracle/oradata/ORCL/system01.dbf'

准备使用隐含参数_allow_resetlogs_corruption强制启动DB：

SQL> show parameter spfile;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string
SQL> create spfile from pfile;

File created.

SQL> shutdown immediate
ORA-01109: database not open


Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open


SQL> show parameter spfile;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string ?/dbs/[email protected]
SQL> alter system set "_allow_resetlogs_corruption"=true scope=spfile;

System altered.

提示：Oracle的隐含参数只应该在测试环境或者在Oracle Support的支持下使用。
设置此参数之后，在数据库Open过程中，Oracle会跳过某些一致性检查，从而使数据库可能跳过不一致状态。

SQL> shutdown immediate;
ORA-01109: database not open


Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
SQL> alter database open resetlogs;

alter database open resetlogs
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel


SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-03114: not connected to ORACLE


SQL> conn /as sysdba
Connected to an idle instance.
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01034: ORACLE not available


SQL> shutdown immediate
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
SVR4 Error: 2: No such file or directory
SQL> startup
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
ORA-00607: Internal error occurred while making a change to a data block
ORA-00600: internal error code, arguments: [4194], [53], [43], [], [], [], [],[]

以上强制启动后，产生Ora-600错误了，在预料之中。。。。

SQL> startup force;
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced


SQL> startup mount
ORACLE instance started.

Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
SQL> set pages 0 feedback off lines 132
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced


SQL>
SQL> !oerr ora 1092
01092, 00000, "ORACLE instance terminated. Disconnection forced"
// *Cause: The instance this process was connected to was terminated
// abnormally, probably via a shutdown abort. This process
// was forced to disconnect from the instance.
// *Action: Examine the alert log for more details. When the instance has been
// restarted, retry action.

SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-03114: not connected to ORACLE


SQL> startup force;
ORA-24324: service handle not initialized
ORA-01041: internal error. hostdef extension doesn't exist
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup force;
ORACLE instance started.
Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced

由于和undo表空间不同步，那好重建undo tablespace：

SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup mount
ORACLE instance started.
Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
SQL> show parameter undo
undo_management string AUTO
undo_retention integer 3600
undo_suppress_errors boolean FALSE
undo_tablespace string UNDOTBS1
SQL> alter system set undo_management=manual scope=spfile;
SQL> alter database open;

先改成不使用undo，可以启动DB，但没法新建对象：

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup;
ORACLE instance started.
Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
Database opened.
SQL>
SQL> conn wacos/oss
Connected.
SQL> select count(*) from tab;
2034
SQL> create table t_test (c1 date);
create table t_test (c1 date)
*
ERROR at line 1:
ORA-01552: cannot use system rollback segment for non-system tablespace 'WACOS'


SQL> !oerr ora 1552
01552, 00000, "cannot use system rollback segment for non-system tablespace '%s'"
// *Cause: Tried to use the system rollback segment for operations involving
// non-system tablespace. If this is a clone database then this will
// happen when attempting any data modification outside of the system
// tablespace. Only the system rollback segment can be online in a
// clone database.
// *Action: Create one or more private/public segment(s), shutdown and then
// startup again. May need to modify the INIT.ORA parameter
// rollback_segments to acquire private rollback segment. If this is
// a clone database being used for tablspace point in time recovery
// then this operation is not allowed.

那就新建一个undo表空间，并弃用原先的：

SQL> create undo tablespace UNDOTBS1 datafile '/opt/oracle/db02/app/oracle/oradata/ORCL/undotbs01.dbf' size 3000m;
create undo tablespace UNDOTBS1 datafile '/opt/oracle/db02/app/oracle/oradata/ORCL/undotbs01.dbf' size 3000m
*
ERROR at line 1:
ORA-01543: tablespace 'UNDOTBS1' already exists


SQL> create undo tablespace UNDOTBS2 datafile '/opt/oracle/db02/app/oracle/oradata/ORCL/undotbs02.dbf' size 3000m;

SQL> show parameter undo
undo_management string MANUAL
undo_retention integer 3600
undo_suppress_errors boolean FALSE
undo_tablespace string UNDOTBS1
SQL> alter system set undo_management=auto scope=spfile;
SQL> alter system set undo_tablespace=UNDOTBS2 scope=spfile;
SQL> shutdown immediate
ORA-01031: insufficient privileges
SQL> show user
USER is "WACOS"
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
Database opened.
SQL> conn wacos/oss
Connected.
SQL> create table t_test (c1 date);
SQL>
SQL> drop tablespace undotbs1;
SQL> create table t_test2 (c1 date);
SQL> select * from t_test;
SQL> insert into t_test values (sysdate);
SQL> commit;
SQL> select * from t_test;
04-MAY-08

现在没问题了，把隐含参数改回默认的：

SQL> alter system set "_allow_resetlogs_corruption"=false scope=spfile;
SQL> shutdown immediate
ORA-01031: insufficient privileges
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup;
ORACLE instance started.
Total System Global Area 826248288 bytes
Fixed Size 732256 bytes
Variable Size 503316480 bytes
Database Buffers 318767104 bytes
Redo Buffers 3432448 bytes
Database mounted.
Database opened.

重启没问题了，问题解决，哈！

SQL> show parameter undo
undo_management string AUTO
undo_retention integer 3600
undo_suppress_errors boolean FALSE
undo_tablespace string UNDOTBS2
SQL> show parameter spfile
spfile string ?/dbs/[email protected]
SQL>

通常使用此方法Open数据库之后，应该立即通过导出、导入重建数据库。

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