归档丢失-数据文件离线-恢复案例

11g库的sysaux表空间因缺少历史归档,导致无法正常online使数据库的很多功能受限，通过BBED实现恢复过程.

 

还原故障

查看状态

SQL> col name for a50 SQL> select file#,name,status from v$datafile;      FILE# NAME                                                               STATUS ---------- ------------------------------------------------------------    -------------          1 /u01/app/oracle/oradata/liyuper/system01.dbf     SYSTEM          2 /u01/app/oracle/oradata/liyuper/sysaux01.dbf     ONLINE          3 /u01/app/oracle/oradata/liyuper/undotbs01.dbf   ONLINE          4 /u01/app/oracle/oradata/liyuper/users01.dbf       ONLINE          5 /u01/app/oracle/oradata/liyuper/example01.dbf  ONLINE          6 /u01/lizi01.dbf                                                      ONLINE          7 /u01/lizi02.dbf                                                      ONLINE          8 /u01/lizi03.dbf                                                      ONLINE          9 /u01/app/oracle/oradata/liyuper/ogg01.dbf          ONLINE 9 rows selected. SQL>

offline数据文件

SQL> alter database datafile 2 offline; Database altered. SQL>

查看归档路径

SQL> archive log list; Database log mode              Archive Mode Automatic archival             Enabled Archive destination            USE_DB_RECOVERY_FILE_DEST Oldest online log sequence     68 Next log sequence to archive   70 Current log sequence           70 SQL> show parameter RECOVERY NAME                                 TYPE        VALUE ------------------------------------ ----------- ------------------------------ db_recovery_file_dest                string      /u01/app/oracle/fast_recovery_                                                  area db_recovery_file_dest_size           big integer 4182M recovery_parallelism                 integer     0 SQL>

切换归档

SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL>

删除归档

[oracle@rac1 ~]$ cd /u01/app/oracle/fast_recovery_area/LIYUPER/archivelog/ [oracle@rac1 archivelog]$ ls -l total 12 drwxr-x--- 2 oracle oinstall 4096 Mar 11 22:58 2019_03_11 drwxr-x--- 2 oracle oinstall 4096 Mar 12 07:26 2019_03_12 drwxr-x--- 2 oracle oinstall 4096 Mar 16 11:35 2019_03_16 [oracle@rac1 archivelog]$ rm * -rf [oracle@rac1 archivelog]$ ls -l total 0 [oracle@rac1 archivelog]$

故障现象

SQL> col name for a50 SQL> select file#,name,status from v$datafile;      FILE# NAME                                               STATUS ---------- -------------------------------------------------- -------          1 /u01/app/oracle/oradata/liyuper/system01.dbf        SYSTEM          2 /u01/app/oracle/oradata/liyuper/sysaux01.dbf        RECOVER          3 /u01/app/oracle/oradata/liyuper/undotbs01.dbf       ONLINE          4 /u01/app/oracle/oradata/liyuper/users01.dbf           ONLINE          5 /u01/app/oracle/oradata/liyuper/example01.dbf      ONLINE          6 /u01/lizi01.dbf                                                          ONLINE          7 /u01/lizi02.dbf                                                          ONLINE          8 /u01/lizi03.dbf                                                          ONLINE          9 /u01/app/oracle/oradata/liyuper/ogg01.dbf             ONLINE 9 rows selected. SQL>

online数据文件

SQL> alter database datafile 2 online; alter database datafile 2 online * ERROR at line 1: ORA-01113: file 2 needs media recovery ORA-01110: data file 2: '/u01/app/oracle/oradata/liyuper/sysaux01.dbf' SQL>

recover数据文件

SQL> recover datafile 2; ORA-00279: change 1308625 generated at 03/16/2019 11:32:15 needed for thread 1 ORA-00289: suggestion : /u01/app/oracle/fast_recovery_area/LIYUPER/archivelog/2019_03_16/o1_mf_1_69_g8rvmhw2_.arc ORA-00280: change 1308625 for thread 1 is in sequence #69 Specify log: {=suggested | filename | AUTO | CANCEL} ORA-00308: cannot open archived log '/u01/app/oracle/fast_recovery_area/LIYUPER/archivelog/2019_03_16/o1_mf_1_69_g8rvmhw2_.arc' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 SQL>

              由于归档被删除，导致数据文件无法recover

修改数据文件头

              现在datafile 2不能恢复，需要修改的就是该datafile header 相关的scn信息，由于只是归档丢失，只需要推进scn即可。

datafile 2 scn

BBED> info  File#  Name                                                                               Size(blks)  -----  ----                                                                                       ----------      1  /u01/app/oracle/oradata/liyuper/system01.dbf                     96000      2  /u01/app/oracle/oradata/liyuper/sysaux01.dbf                     69120      3  /u01/app/oracle/oradata/liyuper/undotbs01.dbf                    11520      4  /u01/app/oracle/oradata/liyuper/users01.dbf                        640      5  /u01/app/oracle/oradata/liyuper/example01.dbf                   40080      6  /u01/lizi01.dbf                                                                       1280      7  /u01/lizi02.dbf                                                                       1280      8  /u01/lizi03.dbf                                                                       1280      9  /u01/app/oracle/oradata/liyuper/ogg01.dbf                           6400 BBED> set file 2 block 1         FILE#           2         BLOCK#          1 BBED> set count 16         COUNT           16 BBED> dump /v offset 484  File: /u01/app/oracle/oradata/liyuper/sysaux01.dbf (2)  Block: 1       Offsets:  484 to  499  Dba:0x00800001 -------------------------------------------------------  d1f71300 00000000 bf77c93b 01000000 l .........w.;....  <16 bytes per line> BBED>

查看数据库scn

SQL> col name for a50 SQL> select file#,name,status,checkpoint_change# from v$datafile;      FILE# NAME                                                                  STATUS         CHECKPOINT_CHANGE# ---------- ------------------------------------------------------------------ ------------------ ------------------          1 /u01/app/oracle/oradata/liyuper/system01.dbf         SYSTEM           1315215          2 /u01/app/oracle/oradata/liyuper/sysaux01.dbf         RECOVER         1308625          3 /u01/app/oracle/oradata/liyuper/undotbs01.dbf        ONLINE             1315215          4 /u01/app/oracle/oradata/liyuper/users01.dbf            ONLINE             1315215          5 /u01/app/oracle/oradata/liyuper/example01.dbf        ONLINE            1315215          6 /u01/lizi01.dbf                                                            ONLINE            1315215          7 /u01/lizi02.dbf                                                            ONLINE            1315215          8 /u01/lizi03.dbf                                                            ONLINE            1315215          9 /u01/app/oracle/oradata/liyuper/ogg01.dbf               ONLINE             1315215 9 rows selected. SQL>

转换16进制

SQL> select to_char('&number','xxxxxxxx') from dual; Enter value for number: 1308625 old   1: select to_char('&number','xxxxxxxx') from dual new   1: select to_char('1308625','xxxxxxxx') from dual TO_CHAR(' ---------    13f7d1 SQL> select to_char('&number','xxxxxxxx') from dual; Enter value for number: 1315215 old   1: select to_char('&number','xxxxxxxx') from dual new   1: select to_char('1315215','xxxxxxxx') from dual TO_CHAR(' ---------    14118f SQL>

bbed修改scn

BBED> modify /x 8f1114 offset 484  File: /u01/app/oracle/oradata/liyuper/sysaux01.dbf (2)  Block: 1                Offsets:  484 to  499           Dba:0x00800001 ------------------------------------------------------------------------  8f111400 00000000 bf77c93b 01000000   <32 bytes per line> BBED> sum apply Check value for File 2, Block 1: current = 0xb120, required = 0xb120 BBED> verify DBVERIFY - Verification starting FILE = /u01/app/oracle/oradata/liyuper/sysaux01.dbf BLOCK = 1 DBVERIFY - Verification complete Total Blocks Examined         : 1 Total Blocks Processed (Data) : 0 Total Blocks Failing   (Data) : 0 Total Blocks Processed (Index): 0 Total Blocks Failing   (Index): 0 Total Blocks Empty            : 0 Total Blocks Marked Corrupt   : 0 Total Blocks Influx           : 0 Message 531 not found;  product=RDBMS; facility=BBED BBED>

恢复数据文件

recover数据文件

SQL> recover datafile 2 Media recovery complete. SQL>

online数据文件

SQL> alter database datafile 2 online; Database altered. SQL>

切归档换

SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL> alter system switch logfile; System altered. SQL>

查看状态

SQL> select file#,name,status,checkpoint_change# from v$datafile;      FILE# NAME                                               STATUS  CHECKPOINT_CHANGE# ---------- -------------------------------------------------- ------- ------------------          1 /u01/app/oracle/oradata/liyuper/system01.dbf       SYSTEM             1316727          2 /u01/app/oracle/oradata/liyuper/sysaux01.dbf       ONLINE             1316727          3 /u01/app/oracle/oradata/liyuper/undotbs01.dbf      ONLINE             1316727          4 /u01/app/oracle/oradata/liyuper/users01.dbf          ONLINE             1316727          5 /u01/app/oracle/oradata/liyuper/example01.dbf      ONLINE             1316727          6 /u01/lizi01.dbf                                                          ONLINE             1316727          7 /u01/lizi02.dbf                                                          ONLINE             1316727          8 /u01/lizi03.dbf                                                          ONLINE             1316727          9 /u01/app/oracle/oradata/liyuper/ogg01.dbf             ONLINE             1316727 9 rows selected. SQL>

 

故障恢复！

 

备注：ub4 kscnbas                        @484        — —真正2号文件的检查点SCN 8f1114  (倒：14118f)