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Oracle 1Z0-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

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

2. Which three prerequisites are needed for creating an Oracle Linux VM instance in the Oracle Cloud Infrastructure?

A) subnet configured on a Virtual Cloud Network (VCN)
B) bare metal Oracle Linux shape
C) Custom Image
D) existing VCN
E) ssh key pair
F) Object Storage

3. Which three statements are true about MySQL Enterprise Backup?

A) It performs logical backups.
B) It performs hot or warm backups.
C) It enables you to take non-locking backups.
D) It provides the ability to create incremental backups.
E) It cannot back up encrypted tablespaces.

4. An existing MySQL Database environment has been doing backup and restore in a logical way by using the mysq1dump and mysq1 client utilities. When the backup is started using mysqldump with single-transaction mode, the existing application has long wait time. When the restore is required, it takes more than three hours to restore.
What two are benefits of using mysqlbackup from MySQL Enterprise Backup in this situation?

A) MySQL Enterprise Backup provides tape backup integration by default. It has the virtual tape option, which allows backup to tape device directly without extra third-party software integration.
B) MySQL Enterprise Backup does not back up system data so that it is much faster.
C) mysqlbackup from MySQL Enterprise Backup allows logical backup with concurrency built in to get faster backup speed and restoration speed.
D) mysqlbackup can back up tables with the InnoDB engine without blocking. The backup is hot with InnoDB. Together with Incremental Backup, mysqlbackup from MySQL Enterprise Backup shortens the backup windows.
E) mysqlbackup utilities dump the full database into a SQL file, which is imported into the mysql client in single-thread mode. mysqlbackup restores data from physical backups. Physical backup methods are faster than logical methods because they involve only file coping without conversion.

5. Which three options are valid reasons for using a primary key in a table?

A) automatic storage of data in a sorted order
B) exporting data faster with mysqldump
C) increasing performance when using select statements
D) maintaining a history of row insertions or updates
E) preventing duplicate keys
F) to make it easier to change the PRIMARY KEY value

Solutions: