易理解的1Z0-082考試重點 & Oracle 1Z0-082測試題庫：Oracle Database Administration I壹次通過考試

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最新的 Oracle Database 19c 1Z0-082 免費考試真題 (Q38-Q43):

問題 #38
Evaluate these commands which execute successfully:

Which two statements are true about the ORD_ITEMS table and the ORD_SEQ sequence?
(Choose two.)

A. Column ORD_NO gets the next number from sequence ORD_SEQ whenever a row is inserted into ORD_ITEMS and no explicit value is given for ORD_NO
B. Sequence ORD_SEQ is guaranteed not to generate duplicate numbers
C. Any user inserting rows into table ORD_ITEMS must have been granted access to sequence ORD_SEQ
D. If sequence ORD_SEQ is dropped then the default value for column ORD_NO will be NULL for rows inserted into ORD_ITEMS
E. Sequence ORD_SEQ cycles back to 1 after every 5000 numbers and can cycle 20 times

答案：B,C

問題 #39
Which two statements are true about Database Instances and Real Application Clusters (RAC)?

A. Two RAC databases can share their instances.
B. A RAC database can have instances on separate servers.
C. A RAC database must have three or more Instances.
D. A RAC database can have one Instance.
E. A RAC database must have two or more instances.

答案：B,D

問題 #40
Examine this command:
SQL> ALTER TABLE ORDERS SHRINK SPACE COMPACT
Which two statements are true?

A. The shrink operation causes rows to be moved to empty space starting toward the end of the orders segment.
B. Only queries are allowed on ORDERS while the shrink is executing.
C. The shrink operation causes rows to be moved to empty space starting from the beginning of the orders segment.
D. The high-water mark (HWM) of orders is adjusted.
E. Queries and DML statements are allowed on ORDERS while the shrink is executing.
F. Dependent indexes become UNUSABLE.

答案：C,E

問題 #41
Which two are true about a SQL statement using SET operators such as UNION? (Choose two.)

A. The names and number of columns must be identical for all SELECT statements in the query.
B. The number, but not names, of columns must be identical for all SELECT statements in the query.
C. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query.
D. The data type of each column returned by the second query must exactly match the data type of the corresponding column returned by the first query.
E. The data type group of each column returned by the second query must match the data type of the corresponding column returned by the first query.

答案：D,E

問題 #42
Which two statements are true about single row functions? (Choose two.)

A. TRUNC : can be used to combine any number of values
B. MOD : returns the quotient of a division operation
C. FLOOR : returns the smallest integer greater than or equal to a specified number
D. CEIL : can be used for positive and negative numbers
E. CONCAT : can be used to combine any number of values

答案：A,B

解題說明：
Explanation/Reference: https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/Single-Row- Functions.html#GUID-B93F789D-B486-49FF-B0CD-0C6181C5D85C

問題 #43
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