db_file损坏恢复 之 用户表空间的数据文件损坏

用户表空间的数据文件损坏

备份

SQL> alter tablespace users begin backup;

Tablespace altered.

SQL> select name from v$datafile;

NAME

--------------------------------------------------

/erikxue/system01.dbf

/erikxue/undotbs01.dbf

/erikxue/sysaux01.dbf

/erikxue/users01.dbf

/erikxue/mytbs01.dbf

SQL> ! cp /erikxue/users01.dbf /u01/oracle/

SQL> alter tablespace users end backup;

Tablespace altered.

SQL>

产生多次交易

update scott.emp set sal=sal+1;

commit;

alter system switch logfile;

.....

SQL> select * from scott.emp;

    EMPNO ENAME      JOB       MGR HIREDATE    SAL       COMM     DEPTNO

---------- ---------- --------- ---------- --------- ---------- ---------- ----------

     7369 SMITH      CLERK      7902 17-DEC-80    809   20

     7499 ALLEN      SALESMAN      7698 20-FEB-81   1609        300   30

     7521 WARD       SALESMAN      7698 22-FEB-81   1259        500   30

     7566 JONES      MANAGER      7839 02-APR-81   2984   20

     7654 MARTIN     SALESMAN      7698 28-SEP-81   1259       1400   30

     7698 BLAKE      MANAGER      7839 01-MAY-81   2859   30

     7782 CLARK      MANAGER      7839 09-JUN-81 2461.2   10

     7788 SCOTT      ANALYST      7566 19-APR-87   3009   20

     7839 KING       PRESIDENT   17-NOV-81 5011.2   10

     7844 TURNER     SALESMAN      7698 08-SEP-81   1509 0   30

     7876 ADAMS      CLERK      7788 23-MAY-87   1109   20

     7900 JAMES      CLERK      7698 03-DEC-81    959   30

     7902 FORD       ANALYST      7566 03-DEC-81   3009   20

     7934 MILLER     CLERK      7782 23-JAN-82 1311.2   10

14 rows selected.

SQL> ! ls

1  1.txt  afiedt.buf  arc1  a.sh  Desktop  mystat2.sqlmystat.sql  oratab

SQL> select name from v$datafile;

NAME

--------------------------------------------------

/erikxue/system01.dbf

/erikxue/undotbs01.dbf

/erikxue/sysaux01.dbf

/erikxue/users01.dbf

/erikxue/mytbs01.dbf

SQL> ! cp 1.txt /erikxue/users01.dbf

将数据文件损坏 还能查到数据 因为db_buffer_cache中有缓存块

SQL> select * from scott.emp;

    EMPNO ENAME      JOB       MGR HIREDATE    SAL       COMM     DEPTNO

---------- ---------- --------- ---------- --------- ---------- ---------- ----------

     7369 SMITH      CLERK      7902 17-DEC-80    809   20

     7499 ALLEN      SALESMAN      7698 20-FEB-81   1609        300   30

     7521 WARD       SALESMAN      7698 22-FEB-81   1259        500   30

     7566 JONES      MANAGER      7839 02-APR-81   2984   20

     7654 MARTIN     SALESMAN      7698 28-SEP-81   1259       1400   30

     7698 BLAKE      MANAGER      7839 01-MAY-81   2859   30

     7782 CLARK      MANAGER      7839 09-JUN-81 2461.2   10

     7788 SCOTT      ANALYST      7566 19-APR-87   3009   20

     7839 KING       PRESIDENT   17-NOV-81 5011.2   10

     7844 TURNER     SALESMAN      7698 08-SEP-81   1509 0   30

     7876 ADAMS      CLERK      7788 23-MAY-87   1109   20

     7900 JAMES      CLERK      7698 03-DEC-81    959   30

     7902 FORD       ANALYST      7566 03-DEC-81   3009   20

     7934 MILLER     CLERK      7782 23-JAN-82 1311.2   10

14 rows selected.

SQL> alter system switch logfile;

System altered.

SQL> select * from scott.emp;

select * from scott.emp

*

ERROR at line 1:

ORA-00376: file 4 cannot be read at this time

ORA-01110: data file 4: '/erikxue/users01.dbf'

SQL> select * from v$recover_file;

    FILE# ONLINE  ONLINE_ ERROR       CHANGE# TIME

---------- ------- ------- ---------------------------------------- ---------- ---------

4 OFFLINE OFFLINE WRONG FILE TYPE     0

SQL> ! cp /u01/oracle/users01.dbf /erikxue/users01.dbf

SQL> select * from v$recover_file;

    FILE# ONLINE  ONLINE_ ERROR       CHANGE# TIME

---------- ------- ------- ---------------------------------------- ---------- ---------

4 OFFLINE OFFLINE868427 28-FEB-11

SQL> alter tablespace users online;

alter tablespace users online

*

ERROR at line 1:

ORA-01113: file 4 needs media recovery

ORA-01110: data file 4: '/erikxue/users01.dbf'

SQL> select * from v$recovery_log;

  THREAD#  SEQUENCE# TIMEARCHIVE_NAME

---------- ---------- --------- ---------------------------------------------

1   67 28-FEB-11 /home/oracle/arc1/67_1_744004808.arc

1   68 28-FEB-11 /home/oracle/arc1/68_1_744004808.arc

1   69 28-FEB-11 /home/oracle/arc1/69_1_744004808.arc

SQL> recover datafile 4;

ORA-00279: change 868427 generated at 02/28/2011 17:38:17 needed for thread 1

ORA-00289: suggestion : /home/oracle/arc1/67_1_744004808.arc

ORA-00280: change 868427 for thread 1 is in sequence #67

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

auto

ORA-00279: change 868522 generated at 02/28/2011 17:41:32 needed for thread 1

ORA-00289: suggestion : /home/oracle/arc1/68_1_744004808.arc

ORA-00280: change 868522 for thread 1 is in sequence #68

ORA-00278: log file '/home/oracle/arc1/67_1_744004808.arc' no longer needed for this recovery

ORA-00279: change 868527 generated at 02/28/2011 17:41:33 needed for thread 1

ORA-00289: suggestion : /home/oracle/arc1/69_1_744004808.arc

ORA-00280: change 868527 for thread 1 is in sequence #69

ORA-00278: log file '/home/oracle/arc1/68_1_744004808.arc' no longer needed for this recovery

Log applied.

Media recovery complete.

SQL> alter tablespace users online;

Tablespace altered.

SQL> select * from scott.emp;

    EMPNO ENAME      JOB       MGR HIREDATE    SAL       COMM     DEPTNO

---------- ---------- --------- ---------- --------- ---------- ---------- ----------

     7369 SMITH      CLERK      7902 17-DEC-80    809   20

     7499 ALLEN      SALESMAN      7698 20-FEB-81   1609        300   30

     7521 WARD       SALESMAN      7698 22-FEB-81   1259        500   30

     7566 JONES      MANAGER      7839 02-APR-81   2984   20

     7654 MARTIN     SALESMAN      7698 28-SEP-81   1259       1400   30

     7698 BLAKE      MANAGER      7839 01-MAY-81   2859   30

     7782 CLARK      MANAGER      7839 09-JUN-81 2461.2   10

     7788 SCOTT      ANALYST      7566 19-APR-87   3009   20

     7839 KING       PRESIDENT   17-NOV-81 5011.2   10

     7844 TURNER     SALESMAN      7698 08-SEP-81   1509 0   30

     7876 ADAMS      CLERK      7788 23-MAY-87   1109   20

     7900 JAMES      CLERK      7698 03-DEC-81    959   30

     7902 FORD       ANALYST      7566 03-DEC-81   3009   20

     7934 MILLER     CLERK      7782 23-JAN-82 1311.2   10

14 rows selected.

SQL>