Oracle 11G OCP 1Z0-053 215

LuiseDalian發表於2014-09-04
(215)Which two statements regarding the Flashback Table feature are correct?(Choose two.)

A. Flashback Table can be performed on system tables.

B. Flashback Table operation does not shrink the segments.

C. Flashback Table uses log mining to extract SQL_REDO and SQL_UNDO statements.

D. Flashback Table operation acquires exclusive data manipulation language (DML) locks.


答案:(B、D)

解析:

A(X),不能對系統表、遠端表和fixed table 執行閃回表操作

C(X),閃回表操作使用undo還原資料,不需要用logminer來挖掘redo_sql和undo_sql

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