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Oracle Database Administration I Sample Questions (Q18-Q23):

NEW QUESTION # 18
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 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.
C. The number, but not names, of columns must be identical for all SELECT statements in the 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.

Answer: D,E

NEW QUESTION # 19
Which two are true about instance recovery for a database that is open in read write mode?
(Choose two.)

A. No users can log on until instance recovery has completed.
B. It is guaranteed to complete within fast_start_mttr_target number of seconds.
C. It is always performed when opening a database.
D. It always occurs during instance startup performed immediately after a SHUTDOWN ABORT.
E. The database opens after the roll forward phase of instance recovery has completed.
F. Only the CURRENT REDO log group is required to perform instance recovery.

Answer: C,D

NEW QUESTION # 20
Which three statements are true about dropping and unused columns in an Oracle database? (Choose three.)

A. A DROP COLUMN command can be rolled back
B. An UNUSED column's space is reclaimed automatically when the block containing that column is next queried.
C. Partition key columns cannot be dropped.
D. A column that is set to UNUSED still counts towards the limit of 1000 columns per table
E. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
F. An UNUSED column's space is reclaimed automatically when the row containing that column is next queried.

Answer: C,D,E

NEW QUESTION # 21
You execute this query:
SELECT TO_CHAR(NEXT_DAY(LAST_DAY(SYSDATE), 'MON'), 'dd "Monday for" fmMonth rrrr') What is the result?

A. It generates an error
B. It executes successfully but does not return any result
C. It returns the date for the last Monday of the current month
D. It returns the date for the first Monday of the next month

Answer: D

NEW QUESTION # 22
Which two statements are true about single row functions? (Choose two.)

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

Answer: B,E

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

NEW QUESTION # 23
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