第110題-OCP認證062考試題庫2019最新考題解析
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QUESTION 110
You create a table with t he PERIOD FOR clause to enable the use of t he Temporal Validity feature of Oracle Database 12c.
Examine the table definition:
create table employees
(empno number,
salary number,
deptid number,
name varchar2(100),
period for employee_time);
Which three statements are true concerning the use of t he Valid Time Temporal feature for the EMPLOYEES table?
A. The valid time columns employee_time_start and employee_time_end are automatically created.
B. The same statement may filter on both transaction time and valid temporal time by using the AS OF TIMESTAMP and PERIOD FOR clauses.
C. The valid time columns are not populated by the Oracle Server automatically.
D. The valid time columns are visible by default when t he table is described.
E. Setting the session valid time using DBMS_FLASHBACK_ARCHIVE.ENABLE_AT_VALID_TIME sets t he visibility for data manipulation language (DML), data definition language (DDL), and queries performed by the session.
Correct Answer: ABE
