为rman启用block change tracking，提高增量备份性能

--启用block change trace
alter database enable block change tracking using file '/oracle/changetrace/rman_change_track.f';

--查看当前的数据库是否启用了change trace
select bytes/1024/1024 m,status,filename from V$BLOCK_CHANGE_TRACKING;

--禁用change trace
alter database disable block change tracking;

--重用已存在的change trace
alter database enable block change tracking using file '/oracle/changetrace/rman_change_track.f' reuse;

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