Oracle 11G OCP 1Z0-053 215
(215)Which two statements regarding the Flashback Table feature are correct?(Choose two.)
答案:(B、D)
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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