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Oracle MySQL 2021 Implementation Essentials Sample Questions:

1. Which two deployment architectures could you use for scaling-out database reads?

A) Adding a memcached-tier for caching data and objects in RAM to reduce the number of times an external data source must be read.
B) Implementing a three-node, single-primary InnoDB Cluster.
C) Changing the system setting with memory stickiness to true in order not to swap out mysq1dfrom memory.
D) Edit the configuration file and increase the value for parallel_read_workers and reboot the server
E) Altering the storage engine for all tables to memory to increase performance.

2. Consider this SQL statement which is using the innoDB storage engine and with global AUTOCOMMIT = 1:

What is the result after issuing the rollback command?

A) Only the t1 table is created.
B) Only the t2 table is created.
C) Both the tables, t1 and t2, are not created because there is an explicit ROLLBACK.
D) Both the tables, t1 and t2, are created.

3. After installing MySQL 8.0, you initialize the data directory with the --initialize command. Which two are places where you can find the root password?

A) As root, execute the show password command by using the SHA-256 password encryption plug-in.
B) The root password displayed on the screen via a [warning] message.
C) The root password inserted in the error log set by the --log-error=[file_name] variable
D) The root password is not given and is blank. You must manually set the root password.
E) The root_pw variable stored in the mysq1.install table.

4. MySQL is installed on a Linux server with the configuration:
Which two methods can change the default options to use the authentication plug-in that implements SHA-256 hashing for user account passwords?

A) Create user by using CREATE USER 'newuser'@'localhost' IDENTIFIED WITH 'Sh@256Pa33';
B) Create user by using CREATE USER 'newuser' @'localhost' SET PASSWORD AS 'Sh@256Pa33';
C) Add --default_authentication_plugin=sha256_password on the command line when you invoke the server.
D) Add default_authentication_plugin=sha256_password under [mysqld] in the configuration file.

5. You just installed MySQL by Using a Package Manager on Linux.
Where are the default InnoDB redo log files stored?

A) /usr/mysql
B) /usr/bin/logs
C) /usr/redo
D) /etc/my.cnf
E) /var/lib/mysql
F) /var/lib/mysql/innodb

Solutions: