Question 1

Examine this statement, which executes successfully:

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You want to improve the performance of this query:

Other-Image-4d087695c-370a-4149-9dae-43fdb2993133

Which change enables the query to succeed while accessing fewer rows?

Options :

A : ALTER TABLE world.city ADD SPATIAL INDEX (Name);

B : ALTER TABLE world.city ADD SPATIAL INDEX (Population);

C : ALTER TABLE world.city ADD INDEX (Population);

D : ALTER TABLE world.city ADD INDEX (Name);

E : ALTER TABLE world.city ADD FULLTEXT INDEX (Name);

F : ALTER TABLE world.city ADD FULLTEXT INDEX (Population);

Answer: B

Question 2

You are considering using file-system snapshots to back up MySQL.

Which three statements are true? (Choose three.)

Options :

A : They take roughly twice as long as logical backups.

B : They allow direct copying of table rows with operating system copy commands.

C : They work best for transaction storage engines that can perform their own recovery when restored.

D : The backup window is almost zero from the perspective of the application.

E : They do not back up views, stored procedures, or configuration files.

F : There is a slight performance cost while the snapshot is active.

G : They do not use additional disk space.

Answer: A,C

Question 3

Your MySQL server was upgraded from an earlier major version.

The sales database contains three tables, one of which is the transactions table, which has 4 million rows.

You are running low on disk space on the datadir partition and begin to investigate.

Examine these commands and output:

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Which two statements are true? (Choose two.)

Options :

A :

Executing SET GLOBAL innodb_row_format=COMPRESSED and then ALTER TABLE transactions

will free up disk space.

B : Executing ALTER TABLE transactions will enable you to free up disk space.

C : Truncating the sales and leads table will free up disk space.

D : Truncating the transactions table will free up the most disk space.

E : The transactions table was created with innodb_file_per_table=OFF.

Answer: A

Question 4

You have just created a replication slave from a backup of the master made with mysqldump:

2020-03-14-14-37-11-4ec4153145d3e66368ed58ed6f5922f5

You try to log in to the slave with the application user, but fail as follows:

The login works on the master.

Which two changes to the process can fix the issue?

Options :

A : After the restore, log in to the database and execute FLUSH PRIVILEGES.

B : Use the --flush-privileges with mysqldump.

C : Add a second dump for the 'mysql' database; --all-databases does not include it.

D : Use the --grants option to include GRANT statements in the dump.

Answer: B

Question 5

You adjust a default configuration to the following /etc/my.cnf on a Linux installation:

[mysqld]

Loq-bin

Binrylog_format=ROW

You do not notice the spelling error in binrylog_format and restart your production server.

How does the MySQL server behave with incorrectly spelled options?

Options :

A : Mysqld uses internal configuration versioning and reverts to the previous configuration.

B : When using mysql_config_editor for configuration adjustments, it detects incorrect syntax and typing mistakes.

C : The mysqld_safe script skips the unknown variable and starts using the remaining configuration changes.

D : Mysqld prints to the error log about an unknown variable, and then exits.

Answer: D

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