题目内容

轴承合金与轴承衬应结合牢固，轴承合金表面不得有（）、（）、（）、（）等缺陷。

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User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA, whichcommands must you execute to enable SCOTT to flash back the transactions? （）(Choose four.)

ALTER DATABASE FLASHBACK ON;
B. GRANT SELECT any transaction TO scott;
C. GRANT EXECUTE ON dbms_flashback TO scott;
D. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
E. ALTER TABLESPACE undots1 RETENTION GUARANTEE;
F. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS

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You are managing an Oracle 11g database with ASM storage， for which the COMPATIBLE initialization parameter is set to 11.1.0. In the ASM instance， the COMPATIBLE.RDBMS attribute for the disk group is set to 10.2 and the COMPATIBLE.ASM attribute is set to 11.1. Which two statements are true in this scenario for the features enabled for ASM？（）

A. The ASM-preferred mirror read feature is enabled.
B. The ASM supports variable sizes for extents of 1，8，and 64 allocation units.
C. The ASM disk is dropped immediately from a disk group when it becomes unavailable.
D. The RDBMS always reads the primary copy of a mirrored extent of the ASM disk group.

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语文素质

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两个ATC天线位于（）

A. 机腹中线前部区域
B. 机背中线前部区域
C. 机身中线前部区域上下各一个
D. 机身中线后部区域上下各一个

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