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Oracle Database SQL Sample Questions (Q143-Q148):

NEW QUESTION # 143
Which two statements about INVISIBLE indexes are true?

Answer: D,E

Explanation:
INVISIBLE indexes are a feature in Oracle Database 12c and later versions that allow an index to be maintained but not used by the optimizer unless explicitly hinted.
A). False. An INVISIBLE index still consumes storage space as it is maintained in the background.
B). False. There is no such restriction. You can create multiple INVISIBLE indexes on the same column list.
C). False. The optimizer can consider INVISIBLE indexes if they are hinted at in the query.
D). True. You can alter the visibility of an index using the ALTER INDEX command to make an INVISIBLE index VISIBLE.
E). True. Even though they are invisible to the optimizer by default, all DML operations such as INSERT, UPDATE, and DELETE continue to maintain the index as they would with a VISIBLE index.


NEW QUESTION # 144
An Oracle database server session has an uncommitted transaction in progress which updated 5000 rows in a table.
In which three situations does the transactions complete thereby committing the updates? (Choose three.)

Answer: B,C,F

Explanation:
Explanation/Reference:


NEW QUESTION # 145
Which two are true about the data dictionary?

Answer: D,E


NEW QUESTION # 146
Examine the description of the EMPLOYEES table:

Which query is valid?

Answer: B

Explanation:
When using the GROUP BY clause, every column in the SELECT clause that is not an aggregate function must be included in the GROUP BY clause:
A . SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date: This is a valid query because all non-aggregate columns in the SELECT list (dept_id and join_date) are included in the GROUP BY clause.
Queries B and C are invalid because they attempt to nest aggregate functions, which is not allowed. Query D is invalid because join_date is not included in the GROUP BY clause.
Reference:
Oracle Database SQL Language Reference 12c, specifically the section on GROUP BY clause constraints.


NEW QUESTION # 147
Which two statements are true regarding savepoints? (Choose two.)

Answer: A,D

Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/cd/B19306_01/server.102/b14200/
statements_10001.htm#SQLRF01701


NEW QUESTION # 148
......

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