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()
 CHANGE#                        NUMBER
 TIME                            DATE

SQL> select * from v$backup;

     FILE# STATUS         CHANGE# TIME
---------- ------------------ ---------- ---------
      NOT ACTIVE
      NOT ACTIVE
      NOT ACTIVE
      ACTIVE          -NOV-
      NOT ACTIVE               

SQL> 

SQL> shutdown abort
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area   bytes
Fixed Size             bytes
Variable Size           bytes
Database Buffers       bytes
Redo Buffers             bytes
Database mounted.
ORA-: file  needs media recovery
ORA-: data file :
'/u01/app/oracle/product/10.2.0/db_2/oradata/orcl/users01.dbf'

SQL> select * from v$backup;

     FILE# STATUS         CHANGE# TIME
---------- ------------------ ---------- ---------
      NOT ACTIVE
      NOT ACTIVE
      NOT ACTIVE
      ACTIVE          -NOV-
      NOT ACTIVE               

SQL> alter tablespace users end backup;

Tablespace altered.

SQL> alter database open;

Database altered.

SQL>