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Question No. 1

Select two suitable statements regarding the data types of PostgreSQL.

A. One field can handle up to 1GB of data.
B. 'n' in CHARACTER(n) represents the number of bytes.
C. Only the INTEGER type can be declared as an array.
D. There is a non-standard PostgreSQL data type, called Geometric data type, which handles 2dimensional data.
E. A large object data type can be used to store data of unlimited size.

Answer: A, D

Question No. 2

PostgreSQL can use an index to access a table. Select two incorrect statements about indexes.

A. An index is created by 'CREATE INDEX', and deleted by 'DROP INDEX'.
B. By using an index effectively, searching and sorting performs faster.
C. There are B-tree, Hash, R-tree and GiST index types.
D. By creating an index, performance always improves.
E. Creating an unused index does not affect the performance of a database at all.

Answer: D, E

Question No. 3

Select two transaction isolation levels supported in PostgreSQL.

A. DIRTY READ
B. READ COMMITTED
C. REPEATABLE READ
D. PHANTOM READ
E. SERIALIZABLE

Answer: B, E

Question No. 4

Select two suitable statements regarding the following SQL statement:

CREATE TRIGGER trigger_1 AFTER UPDATE ON sales FOR EACH ROW EXECUTE PROCEDURE write_log();

A. It is defining a trigger "trigger_1".
B. Every time 'UPDATE' is executed on the "sales" table, the "write_log" function is called once.
C. The "write_log" function is called before 'UPDATE' takes place.
D. 'UPDATE' is not executed if "write_log" returns NULL.
E. 'DROP TRIGGER trigger_1 ON sales;' deletes the defined trigger.

Answer: A, E

Question No. 5

Select two correct descriptions about views.

A. A view is created by 'DECLARE VIEW', and deleted by 'DROP VIEW'.
B. A view is a virtual table which does not exist.
C. A view is created to simplify complicated queries.
D. You can create a view with the same name as already existing tables.
E. A view only exists while the postmaster is running, and is deleted when the postmaster stops.

Answer: B, C

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