053第383题

标签：ocp

原题答案是E，有的版本答案选C，个人觉得正确答案是E

首先flashback drop 命令中没有指定SCN或者TIMESTAMP的选项，所以ABD不对，然后FLASHBACK DROP命令不会在RECYCLE BIN里面创建对象，所以C不对。

当处理回收站里面有多个相同original name的对象时，可以使用 对象在回收站中的名字(unique name)，如题目中所示。本题目中最可能的原因是DBA对 recycle bin中的对象drop time 判断错误，进而导致使用了错误的unique name.

You can also retrieve any table from the recycle bin, regardless of any collisions among original names, by using the unique recycle bin name of the table. For example, assume that you query the recycle bin as follows (sample output included):

SELECT object_name, original_name, createtime 
FROM   recyclebin;    

OBJECT_NAME                    ORIGINAL_NAME   CREATETIME
------------------------------ --------------- -------------------
BIN$yrMKlZaLMhfgNAgAIMenRA==$0 TEMP_EMPLOYEES  2007-02-05:21:05:52
BIN$yrMKlZaVMhfgNAgAIMenRA==$0 TEMP_EMPLOYEES  2007-02-05:21:25:13
BIN$yrMKlZaQMhfgNAgAIMenRA==$0 TEMP_EMPLOYEES  2007-02-05:22:05:53

You can use the following command to retrieve the middle table:

FLASHBACK TABLE BIN$yrMKlZaVMhfgNAgAIMenRA==$0 TO BEFORE DROP;

参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmflash.htm#BRADV81330

053第383题

标签：ocp

原文地址：http://blog.csdn.net/adeline_pan/article/details/46874145