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标题：Oracle 12c redo 丢失恢复

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

模拟redo丢失
对数据库的一个pdb模拟事务操作，然后abort库，并且删除所有redo，模拟生产环境redo丢失的case

[oracle@ora1221 oradata]$ ss

SQL*Plus: Release 12.2.0.0.3 Production on Wed Jun 15 10:13:20 2016

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 2516582400 bytes
Fixed Size                  8260048 bytes
Variable Size             671090224 bytes
Database Buffers         1828716544 bytes
Redo Buffers                8515584 bytes
Database mounted.
Database opened.
SQL> 
SQL> 
SQL> set pages 100
SQL> show pdbs;

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB1                           MOUNTED
         4 PDB2                           MOUNTED
SQL> select con_id,file#,checkpoint_change# from v$datafile_header order by 1;

    CON_ID      FILE# CHECKPOINT_CHANGE#
---------- ---------- ------------------
         1          1            1500157
         1          3            1500157
         1          4            1500157
         1          7            1500157
         2          5            1371280
         2          6            1371280
         2          8            1371280
         3          9            1499902
         3         12            1499902
         3         11            1499902
         3         10            1499902
         4         15            1499903
         4         14            1499903
         4         13            1499903
         4         16            1499903

15 rows selected.

SQL> alter PLUGGABLE database pdb1 open;                                      

Pluggable database altered.

SQL> show pdbs;

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB1                           READ WRITE NO
         4 PDB2                           MOUNTED
SQL> alter session set container=pdb1;

Session altered.

SQL> create user chf identified by oracle;

User created.

SQL> grant dba to chf;

Grant succeeded.

SQL> create table chf.t_pdb1_xifenfei as select * from dba_objects;

Table created.

SQL> delete from chf.t_pdb1_xifenfei;

72426 rows deleted.

--另外一个节点
[oracle@ora1221 ~]$ ss

SQL*Plus: Release 12.2.0.0.3 Production on Wed Jun 15 10:19:21 2016

Copyright (c) 1982, 2016, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.0.3 - 64bit Production

SQL> shutdown abort
ORACLE instance shut down.

[oracle@ora1221 orcl12c2]$ ls redo*
redo01.log  redo02.log  redo03.log
[oracle@ora1221 orcl12c2]$ rm redo0*
[oracle@ora1221 orcl12c2]$ ls -l redo*
ls: cannot access redo*: No such file or directory

尝试启动数据库

[oracle@ora1221 orcl12c2]$ ss

SQL*Plus: Release 12.2.0.0.3 Production on Wed Jun 15 10:26:20 2016

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup mount;
ORACLE instance started.

Total System Global Area 2516582400 bytes
Fixed Size                  8260048 bytes
Variable Size             671090224 bytes
Database Buffers         1828716544 bytes
Redo Buffers                8515584 bytes
Database mounted.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/orcl12c2/redo01.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7

使用隐含参数启动

----pfile里面增加
_allow_error_simulation=TRUE
_allow_resetlogs_corruption=true
~

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


Database dismounted.
ORACLE instance shut down

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

Total System Global Area 2516582400 bytes
Fixed Size                  8260048 bytes
Variable Size             671090224 bytes
Database Buffers         1828716544 bytes
Redo Buffers                8515584 bytes
Database mounted.
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-00603: ORACLE server session terminated by fatal error
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [],
[], [], [], [], [], [], []
Process ID: 36797
Session ID: 16 Serial number: 24277

继续重启库
ORA-600 kcbzib_kcrsds_1错误尝试重启数据库,如果不行,考虑使用bbed修改文件头信息

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

Total System Global Area 2516582400 bytes
Fixed Size                  8260048 bytes
Variable Size             671090224 bytes
Database Buffers         1828716544 bytes
Redo Buffers                8515584 bytes
Database mounted.

SQL> recover database until cancel;
ORA-00283: recovery session canceled due to errors
ORA-16433: The database or pluggable database must be opened in read/write
mode.


SQL> alter database backup controlfile to trace as '/tmp/ctl';
alter database backup controlfile to trace as '/tmp/ctl'
*
ERROR at line 1:
ORA-16433: The database or pluggable database must be opened in read/write
mode.

重建控制文件

SQL> startup nomount pfile='/tmp/pfile'
ORACLE instance started.

Total System Global Area 2516582400 bytes
Fixed Size                  8260048 bytes
Variable Size             671090224 bytes
Database Buffers         1828716544 bytes
Redo Buffers                8515584 bytes
SQL> CREATE CONTROLFILE REUSE DATABASE "orcl12c2" RESETLOGS  NOARCHIVELOG  
  2      MAXLOGFILES 50  
  3      MAXLOGMEMBERS 5  
  4      MAXDATAFILES 100  
  5      MAXINSTANCES 1  
  6      MAXLOGHISTORY 226  
  7  LOGFILE  
  8    GROUP 1 '/u01/app/oracle/oradata/orcl12c2/redo01.log'  SIZE 200M,  
  9    GROUP 2 '/u01/app/oracle/oradata/orcl12c2/redo02.log'  SIZE 200M,  
 10    GROUP 3 '/u01/app/oracle/oradata/orcl12c2/redo03.log'  SIZE 200M  
 11  DATAFILE  
 12  '/u01/app/oracle/oradata/orcl12c2/system01.dbf',
 13  '/u01/app/oracle/oradata/orcl12c2/sysaux01.dbf',
 14  '/u01/app/oracle/oradata/orcl12c2/undotbs01.dbf',
 15  '/u01/app/oracle/oradata/orcl12c2/pdbseed/system01.dbf',
 16  '/u01/app/oracle/oradata/orcl12c2/pdbseed/sysaux01.dbf',
 17  '/u01/app/oracle/oradata/orcl12c2/users01.dbf',
 18  '/u01/app/oracle/oradata/orcl12c2/pdbseed/undotbs01.dbf',
 19  '/u01/app/oracle/oradata/orcl12c2/pdb1/system01.dbf',
 20  '/u01/app/oracle/oradata/orcl12c2/pdb1/sysaux01.dbf',
 21  '/u01/app/oracle/oradata/orcl12c2/pdb1/undotbs01.dbf',
 22  '/u01/app/oracle/oradata/orcl12c2/pdb1/users01.dbf',
 23  '/u01/app/oracle/oradata/orcl12c2/pdb2/system01.dbf',
 24  '/u01/app/oracle/oradata/orcl12c2/pdb2/sysaux01.dbf',
 25  '/u01/app/oracle/oradata/orcl12c2/pdb2/undotbs01.dbf',
 26  '/u01/app/oracle/oradata/orcl12c2/pdb2/users01.dbf'
 27  CHARACTER SET AL32UTF8  
 28  ;  

Control file created.

SQL> recover database until cancel;
ORA-00283: recovery session canceled due to errors
ORA-01610: recovery using the BACKUP CONTROLFILE option must be done


SQL> recover database until cancel using backup controlfile;
ORA-00279: change 1500161 generated at 06/15/2016 10:40:42 needed for thread 1
ORA-00289: suggestion :
/u01/app/oracle/product/12.2.0/db_2/dbs/arch1_1_914582438.dbf
ORA-00280: change 1500161 for thread 1 is in sequence #1


Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/u01/app/oracle/oradata/orcl12c2/redo01.log
Log applied.
Media recovery complete.
SQL> alter database open resetlogs;

Database altered.
1
<strong>open过程alert日志</strong>
1
<strong>open pdb1</strong>
1
SQL> alter PLUGGABLE database pdb1  open;

Pluggable database altered.

pdb1 open alert日志

2016-06-15T11:13:39.423057+08:00
alter PLUGGABLE database pdb1  open
PDB1(3):Autotune of undo retention is turned on. 
2016-06-15T11:13:39.495559+08:00
PDB1(3):Endian type of dictionary set to little
PDB1(3):[40547] Successfully onlined Undo Tablespace 2.
PDB1(3):Undo initialization finished serial:0 start:371149831 end:371149872 diff:41 ms (0.0 seconds)
PDB1(3):Database Characterset for PDB1 is AL32UTF8
PDB1(3):*********************************************************************
PDB1(3):WARNING: The following temporary tablespaces in container(PDB1)
PDB1(3):         contain no files.
PDB1(3):         This condition can occur when a backup controlfile has
PDB1(3):         been restored.  It may be necessary to add files to these
PDB1(3):         tablespaces.  That can be done using the SQL statement:
PDB1(3): 
PDB1(3):         ALTER TABLESPACE <tablespace_name> ADD TEMPFILE
PDB1(3): 
PDB1(3):         Alternatively, if these temporary tablespaces are no longer
PDB1(3):         needed, then they can be dropped.
PDB1(3):           Empty temporary tablespace: TEMP
PDB1(3):*********************************************************************
PDB1(3):Opatch validation is skipped for PDB PDB1 (con_id=0)
PDB1(3):Opening pdb with no Resource Manager plan active
Pluggable database PDB1 opened read write
Completed: alter PLUGGABLE database pdb1  open

open pdb2

SQL> alter PLUGGABLE database pdb2 open;
alter PLUGGABLE database pdb2 open
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [17090], [], [], [], [], [], [], [],
[], [], [], []

分析alert日志和trace文件

--alert日志部分
PDB1(3):alter PLUGGABLE database pdb2 open
PDB1(3):ORA-65118 signalled during: alter PLUGGABLE database pdb2 open...
2016-06-15T11:28:57.439963+08:00
PDB1(3):Unified Audit: Audit record write to table failed due to ORA-25153. 
Writing the audit record to OS spillover file. Please grep in the trace files for ORA-25153 for more diagnostic information.
Errors in file /u01/app/oracle/diag/rdbms/orcl12c2/orcl12c2/trace/orcl12c2_ora_40547.trc  (incident=29073) (PDBNAME=PDB1):
ORA-00600: internal error code, arguments: [17090], [], [], [], [], [], [], [], [], [], [], []
PDB1(3):Incident details in: /u01/app/oracle/diag/rdbms/orcl12c2/orcl12c2/incident/incdir_29073/orcl12c2_ora_40547_i29073.trc
PDB1(3):*****************************************************************
PDB1(3):An internal routine has requested a dump of selected redo.
PDB1(3):This usually happens following a specific internal error, when
PDB1(3):analysis of the redo logs will help Oracle Support with the
PDB1(3):diagnosis.
PDB1(3):It is recommended that you retain all the redo logs generated (by
PDB1(3):all the instances) during the past 12 hours, in case additional
PDB1(3):redo dumps are required to help with the diagnosis.
PDB1(3):*****************************************************************
2016-06-15T11:28:59.123041+08:00
PDB1(3):Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
2016-06-15T11:28:59.945667+08:00
Dumping diagnostic data in directory=[cdmp_20160615112859], requested by (instance=1, osid=40547), summary=[incident=29073].
2016-06-15T11:35:59.987419+08:00
PDB1(3): alter PLUGGABLE database pdb2 open
PDB1(3):ORA-65118 signalled during:  alter PLUGGABLE database pdb2 open...


--trace部分
PARSING IN CURSOR #0x7f051a3d7650 len=118 dep=1 uid=0 oct=3 lid=0 tim=372490287736 hv=1128335472 ad='0x6ca82f00' sqlid='gu930gd1n223h'
select tablespace_name, tablespace_size, allocated_space, free_space, con_id  from cdb_temp_free_space order by con_id
END OF STMT
EXEC #0x7f051a3d7650:c=0,e=144,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,plh=2538033465,tim=372490287732
FETCH #0x7f051a3d7650:c=0,e=290,p=0,cr=14,cu=0,mis=0,r=0,dep=1,og=4,plh=2538033465,tim=372490288109
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 52 FileOperation=2 fileno=0 filetype=36 obj#=402 tim=372490288373
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 17 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490288577
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 3 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490288655
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 690 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490289365
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 6 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490289470
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 445 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490289934
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 3 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490289983
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 375 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490290374
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 6 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490290453
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 367 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490290839
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 3 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490290882
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 355 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291252
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 4 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291298
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 276 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291590
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 1 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291614
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 256 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291879
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 2 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490291903
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 261 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490292172
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 30 FileOperation=3 fileno=0 filetype=36 obj#=402 tim=372490292225
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 934 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490293171
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 3 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490293208
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 245 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490293465
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 262 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490293755
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 1 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490293780
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 250 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490294039
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 256 FileOperation=8 fileno=1 filetype=36 obj#=402 tim=372490294323
WAIT #0x7f051bd5f870: nam='Disk file operations I/O' ela= 8 FileOperation=5 fileno=0 filetype=36 obj#=402 tim=372490294359
2016-06-15T11:36:00.055196+08:00
Incident 29074 created, dump file: /u01/app/oracle/diag/rdbms/orcl12c2/orcl12c2/incident/incdir_29074/orcl12c2_ora_40547_i29074.trc
ORA-00600: internal error code, arguments: [17090], [], [], [], [], [], [], [], [], [], [], []

从中可以判断出来是由于CDB$ROOT的未增加tempfile导致

SQL> alter tablespace temp add tempfile '/u01/app/oracle/oradata/orcl12c2/temp01.dbf' reuse;

Tablespace altered.

SQL>  alter PLUGGABLE database pdb2 open;

Pluggable database altered.

查看数据库恢复情况

SQL> show pdbs;

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB1                           READ WRITE NO
         4 PDB2                           READ WRITE NO

SQL> select con_id,file#,checkpoint_change#,resetlogs_change# from v$datafile_header;

    CON_ID      FILE# CHECKPOINT_CHANGE# RESETLOGS_CHANGE#
---------- ---------- ------------------ -----------------
         1          1            2500167           1500164
         1          3            2500167           1500164
         1          4            2500167           1500164
         2          5            1371280           1341067
         2          6            1371280           1341067
         1          7            2500167           1500164
         2          8            1371280           1341067
         3          9            2501017           1500164
         3         10            2501017           1500164
         3         11            2501017           1500164
         3         12            2501017           1500164
         4         13            2502748           1500164
         4         14            2502748           1500164
         4         15            2502748           1500164
         4         16            2502748           1500164

15 rows selected.

至此基本上测试完成在在cdb环境中丢失redo的恢复。在生产中，需要把temp加全，并且建议重建数据库

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