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Oracle 1Z0-082: Oracle Database Administration I exam is designed to test an individual's knowledge in administering Oracle databases. 1Z1-082 Exam is a part of the Oracle Certified Associate program and is essential for individuals seeking a career in database administration. 1Z1-082 exam is designed to test a candidate's knowledge of database architecture, installation, configuration, backup and recovery, security, and performance tuning.

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Oracle 1Z0-082 exam is a certification exam designed for professionals who are interested in becoming Oracle Database Administrators. 1Z1-082 exam is a part of the Oracle Database Administrator certification track and is the first exam in the series. 1Z1-082 Exam is designed to test the candidate's knowledge of database concepts, SQL, and PL/SQL programming languages. It also covers topics such as database architecture, backup and recovery, and security.

Oracle Database Administration I Sample Questions (Q74-Q79):

NEW QUESTION # 74
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. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
C. An UNUSED column's space is reclaimed automatically when the block containing that column is next queried.
D. A column that is set to UNUSED still counts towards the limit of 1000 columns per table
E. An UNUSED column's space is reclaimed automatically when the row containing that column is next queried.
F. Partition key columns cannot be dropped.

Answer: B,C,D

NEW QUESTION # 75
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 less well than using the >= and <= conditions
D. The BETWEEN condition always performs better than using the >= and <= conditions
E. Table aliases can improve performance

Answer: B,E

Explanation:
https://stackoverflow.com/questions/58476906/1z0-071-oracle-exam-question-which-answers-is-correc

NEW QUESTION # 76
Which three statements are true regarding single row subqueries?

A. They must be placed on the right side of the comparison operator or condition.
B. They can be used in the where clause.
C. A SQL statement may have multiple single row subquery blocks.
D. They can be used in the having clause.
E. They must return a row to prevent errors in the SQL statement.
F. They must be placed on the left side of the comparison operator or condition.

Answer: B,C,D

NEW QUESTION # 77
Examine this SQL statement:
SELECT cust_id, cust_last_name "Last Name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses, any one of which can complete the query successfully. (Choose three.)

A. ORDER BY "Last Name"
B. ORDER BY 2, cust_id
C. ORDER BY 2, 1
D. ORDER BY CUST_NO
E. ORDER BY "CUST_NO"

Answer: B,C,D

NEW QUESTION # 78
Examine this command:

Which two statements are true? (Choose two.)

A. The tablespace containing SALES1.DBF must be altered OFFLINE before executing the command.
B. The file is renamed and stored in the same location
C. If Oracle Managed Files (OMF) is used, then the file is renamed but moved to DB_CREATE_FILE_DEST.
D. DML may be performed on tables with one or more extents in this data file during the execution of this command.
E. The tablespace containing SALES1.DBF must be altered READ ONLY before executing the command.

Answer: D,E

NEW QUESTION # 79
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