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Oracle Database Administration I Sample Questions (Q20-Q25):

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

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

Answer: A,D,F

NEW QUESTION # 21
Which three activities are recorded in the database alert log? (Choose three.)

A. deadlock errors
B. block corruption errors
C. Data Definition Language (DDL) statements
D. non-default database parameters
E. session logins and logouts

Answer: A,B,D

NEW QUESTION # 22
You have been tasked to create a table for a banking application.
One of the columns must meet three requirements:
* Be stored in a format supporting date arithmetic without using conversion functions
* Store a loan period of up to 10 years
* Be used for calculating interest for the number of days the loan remains unpaid Which data type should you use?

A. INTERVAL DAY TO SECOND
B. TIMESTAMP WITH LOCAL TIMEZONE
C. TIMESTAMP WITH TIMEZONE
D. INTERVAL YEAR TO MONTH
E. TIMESTAMP

Answer: A

NEW QUESTION # 23
What is true about non-equijoin statement performance? (Choose two.)

A. The join syntax used makes no difference to performance
B. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax
C. The BETWEEN condition always performs better than using the >= and <= conditions
D. The BETWEEN condition always performs less well than using the >= and <= conditions
E. Table aliases can improve performance

Answer: B,E

NEW QUESTION # 24
In which three situations does a new transaction always start? (Choose three.)

A. when issuing a CREATE INDEX statement after a CREATE TABLE statement completed successfully in the same session
B. when issuing a CREATE TABLE statement after a SELECT statement was issued in the same session
C. when issuing a TRUNCATE statement after a SELECT statement was issued in the same session
D. when issuing the first Data Manipulation Language (DML) statement after a COMMIT OR ROLLBACK statement was issued in the same session
E. when issuing a SELECT FOR UPDATE statement after a CREATE TABLE AS SELECT statement was issued in the same session
F. when issuing a DML statement after a DML statement failed in the same session

Answer: A,D,E

Explanation:
https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/transactions.html#GUID-7690181F-8293-47B9-ADC1-905BD9C3AF57

NEW QUESTION # 25
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