Oracle正确删除归档并回收空间的方法
一个Oracle归档日志经常满，表现为/oraarchive 这个文件空间占用100％大家一定抱怨Oracle为何没有归档维护工具，很多人直接删除了
一个Oracle归档日志经常满，表现为/oraarchive 这个文件空间占用100％大家一定抱怨Oracle为何没有归档维护工具，很多人直接删除了事，错了，Oracle有，而且很智能，可以正确的删除归档和 FLASHBACK，不过切记,Oracle归档日志对于Oracle的数据恢复和备份非常重要，不到万不得已不要删除归档日志。
删除归档日志的过程
以Oracle用户身份登录到数据库服务器主机或通过网络连接
进入Oracle数据备份工具
rman target/
或rman target/@orcl
在命令窗口里面执行
DELETE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE-7';
说明
SYSDATA-7，，表明当前的系统时间7天前，before关键字表示在7天前的归档日志，如果使用了闪回功能，也会删除闪回的数据。
同样道理，也可以删除从7天前到现在的全部日志，不过这个命令要考虑清楚，做完这个删除，最好马上进行全备份数据库
DELETE ARCHIVELOG FROM TIME 'SYSDATE-7';
UNIX/LINUX下也可以通过FIND找到7天前的归档数据，使用EXEC子操作删除
find /oraarchive -xdev -mtime +7 -name "*.dbf" -exec rm -f {} ;
这样做仍然会在RMAN里留下未管理的归档文件
仍需要在RMAN里执行下面2条命令
crosscheck archivelog all;
delete expired archivelog all;
所以还不如上面的方法好用，不过用FIND的好处就是，可以在条件上，和EXEC子项上做很多操作，实现更复杂的功能
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