1z0-071 Exam Dumps | which three statements are true about indexes and their administration in an Oracle database?

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Question 23/139

which three statements are true about indexes and their administration in an Oracle database?

A. The same table column can be part of a unique and non-unique index

B. A DESCENDING INDEX IS A type of function-based index

C. A DROP INDEX statement always prevents updates to the table during the drop operation

D. AN INVISIBLE INDEX is not maintained when DML is performed on its underlying table.

E. AN INDEX CAN BE CREATED AS part of a CREATE TABLE statement

F. IF a query filters on an indexed column then it will always be used during execution of query

Correct Answer: A,D,E

A). True, a single table column can be included in both a unique index and a non-unique index, provided they are different indexes.
D). True, an invisible index is maintained during DML operations, which means it is updated when insert, update, or delete operations are performed on the table. However, it is not used by the optimizer by default for query execution unless explicitly hinted or the session is altered to consider invisible indexes.
E). True, an index can be specified in the CREATE TABLE statement using the INDEX clause to create an index on a specific column at the time of table creation.
B, C, and F are not correct: B. A descending index is simply an index that is sorted in descending order, not a type of function-based index. C. A DROP INDEX

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