Oracle：热备时，突然断电情况处理

    我们在热备时，如果此时突然停电，再次启动时会发生什么情况呢？

SQL> alter tablespace users begin backup;



Tablespace altered.





SQL> desc v$backup

 Name                       Null?    Type

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

 FILE#                            NUMBER

 STATUS                         VARCHAR2(18)

 CHANGE#                        NUMBER

 TIME                            DATE



SQL> select * from v$backup;



     FILE# STATUS         CHANGE# TIME

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

     1 NOT ACTIVE               0

     2 NOT ACTIVE               0

     3 NOT ACTIVE               0

     4 ACTIVE         1376996 21-NOV-13

     6 NOT ACTIVE               0



SQL> 

SQL> shutdown abort

ORACLE instance shut down.

SQL> startup

ORACLE instance started.



Total System Global Area  599785472 bytes

Fixed Size            2022632 bytes

Variable Size          218104600 bytes

Database Buffers      377487360 bytes

Redo Buffers            2170880 bytes

Database mounted.

ORA-01113: file 4 needs media recovery

ORA-01110: data file 4:

'/u01/app/oracle/product/10.2.0/db_2/oradata/orcl/users01.dbf'





SQL> select * from v$backup;



     FILE# STATUS         CHANGE# TIME

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

     1 NOT ACTIVE               0

     2 NOT ACTIVE               0

     3 NOT ACTIVE               0

     4 ACTIVE         1376996 21-NOV-13

     6 NOT ACTIVE               0





SQL> alter tablespace users end backup;



Tablespace altered.



SQL> alter database open;



Database altered.



SQL>