1z0-071 Exam Dumps | Which two statements are true about external tables?

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Question 21/144

Which two statements are true about external tables?

A. Indexes can be created on them.

B. You can populate them from existing data in the database by using the CREATE TABLE AS SELECT command.

C. DML statements cannot be used on them.

D. Their data can be retrieved by using only SQL or PL/SQL.

E. Their metadata and actual data are both stored outside the database.

Correct Answer: C,D

For external tables in Oracle:
C . DML statements cannot be used on them: External tables are read-only in Oracle. They allow access to data in external sources as if it were within a table in the database, but they do not support DML operations (INSERT, UPDATE, DELETE).
D . Their data can be retrieved by using only SQL or PL/SQL: You can query the data in external tables using SQL or PL/SQL, just as you would with regular database tables.
Incorrect options are:
A: You cannot create indexes directly on external tables.
B: External tables cannot be populated using the CREATE TABLE AS SELECT command since they are primarily meant for accessing data stored outside the database.
E: Only the metadata of an external tables is stored in the database; the actual data remains in external files.

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