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NEW QUESTION 39
Examine the appointments table definition which contains one million rows:

Now, examine this statement which executes successfully:

Which statement will improve query performance?

A. ALTER TABLE appointments add index IX_2(attendant_session_id, created_by)B. ALTER TABLE appointments add index IX_3(attendant_id, created_by)C. ALTER TABLE appointments add index IX_1(credit,payment)D. ALTER TABLE appointments add index IX_4<attendant_id, payment, credit)

Answer: D

 

NEW QUESTION 40
The continent column in the country table contains no null values.
Examine this output:

A)

B)

C)

D)

A. Option CB. Option AC. Option BD. Option D

Answer: B

 

NEW QUESTION 41
A server hosts MySQL Server and Apache Webserver supporting a PHP/PDO based application.
The application must be migrated from PHP to their Java application server on another host. The MySQL instance remains on the original host.
Examine the PDO connection string used in the existing application:
Mysql:host-localhost;dbname=sales;unix_socket=/var/run/mysql.sock
Which two prevent Java from using the Unix socket?

A. The X Dev API protocol must be enabled to use sockets in Connector/J driver.B. socket is a reserved word in Java.C. The socket can only be accessed from the local host.D. The socket is not implemented in Connector/J driver.E. Java treats the socket file as insecure.

Answer: D,E

 

NEW QUESTION 42
......


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