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Oracle MySQL 8.0 Database Developer Sample Questions (Q49-Q54):

NEW QUESTION # 49
Examine these MySQL Shell statements:

What is the true about the attempts to add document to the collection?

• A. First two documents are added, then mismatched field names cause an error.
• B. All documents are added without any error or warning.
• C. First two documents are added, then mismatched field names cause a warning.
• D. First three documents are added, then different number of fields cause an error.
• E. All documents are added and cause a warning.

Answer: E
NEW QUESTION # 50
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. The socket can only be accessed from the local host.
• C. Java treats the socket file as insecure.
• D. socket is a reserved word in Java.
• E. The socket is not implemented in Connector/J driver.

Answer: C,E
NEW QUESTION # 51
Examine the structure of the emp table:

Examine the structure of the empvu1 view based on the emp table:

Now, examine this statement:
mysq1> INSERT INTO empvul VALUES ('Alice',20000) ;
What is true about executing the statement?

• A. It inserts a row in the view only.
• B. It inserts a row in the emp table.
• C. It returns an error because an insert operation is not allowed on views.
• D. It returns an error because the PRIMARY ACCOUNT column is not selected for the view definition.

Answer: B
NEW QUESTION # 52
Examine the Test.php script which is numbered for clarity, and its output:

PHP Fatal error: Uncaught Error: call to underined function mysqli_connect () in Test.php:2 Which action will fix this error?

• A. Enable the mysqli extension in the php.ini file.
• B. Replace line 2 With: Slink = mysql_xdevapi\getSession
  ("mysqlx://username:[email protected]:3306","schema");
• C. Replace line 2 with Slink = mysql.connect {"localhost: 3306n, "username", "pas "schema") ;
• D. Install the PHP executable in the path used by the MySQL installation.

Answer: A
NEW QUESTION # 53
Which two are true about indexes?

• A. Secondary index access will always be faster than a table scan.
• B. Indexes reduce disk space used.
• C. Indexes are used to enforce unique constraints.
• D. Indexing all of a table's columns improves performance.
• E. Indexes contain rows sorted by key values.

Answer: B,D
NEW QUESTION # 54
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