block change tracking，修改块的跟踪
1：通过试图查找
SQL> select * from v$block_change_tracking;
STATUS FILENAME BYTES
---------- -------------------- ----------
DISABLED
2：启动功能，并指定文件
SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING using file '/u01/bck';
Database altered.
3：确定生效
SQL> select * from v$block_change_tracking;
STATUS FILENAME BYTES
---------- -------------------- ----------
ENABLED /u01/bck 11599872
4：关闭功能
SQL> ALTER DATABASE disABLE BLOCK CHANGE TRACKING;
Database altered.
5：确定生效
SQL> select * from v$block_change_tracking;
STATUS FILENAME BYTES
---------- -------------------- ----------
DISABLED
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