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Oracle 1Z1-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

1. You have been using mysqldump for logical backups of your MySQL databases. Your MySQL database size has been growing. Which two options can reduce the backup size and speed up the backup time?

A) Use MySQL Enterprise Backup with the - -compress option to compress the backup files and use - - compress-level to select the level of compression.
B) Use mysqldump with the - -changesonly option.
C) Use mysqldump with - -incremental together with the - -compress option to back up incrementally based on previous full backup and compress the incremental backup files.
D) Use MySQL Enterprise Backup with the - -size=compress to compress the backup file.
E) Use MySQL Enterprise Backup with the - - incremental policy to back up incrementally based on previous full backup.

2. An Oracle Cloud Infrastructure customer already has many database instances configured and running in the cloud; however, they are reporting that they are unable to create any more instances.
What could be the problem?

A) The customer account might have reached resource quota/limits.
B) The customer reached the database instance limit of 32.
C) The customer has not kept up with their patching requirements; new instances cannot be created unless the majority or the template of existing instances are up-to-date.
D) The customer does not have proper user rights.

3. You want to create an encrypted table. So, you enter this command:
CREATE TABLE 'test_encryption2% (
'id' int(10) unsigned NOT NULL AUTO_INCREMENT,
'server_name' varchar(15) NOT NULL,
PRIMARY KEY ('id') ) ENGINE=MYISAM AUTO_INCREMENT=l DEFAULT CHARSET=latin1 ENCRYPTION = 'Y1; You receive the following error:
ERROR 1031 (HY000): Table storage engine for 'test_encryption2' doesn't have this option Which statement correctly explains the reason for this error?

A) The term "server_name" is a reserved MySQL term. You cannot use it for the new table. This is what is causing the error.
B) You cannot use the AUTO_INCREMENT option to create an encrypted table. This is what is causing the error.
C) The encryption feature only works with InnoDB tables. You are creating a MylSAM table, and it is causing the error.
D) The test_encryption2 already exist. You are not using the correct option to recreate it and it is causing the error.

4. Which three components can MySQL InnoDB Cluster use to Achieve database high availability?

A) MySQL Router to ensure client requests are load balanced and routed to the correct servers.
B) MySQL Shell to create and administer InnoDB Clusters using the built-in AdminAPI.
C) MySQL Online Hot Backup to keep data consistent and always ready to be used.
D) MySQL X Plugin to enable MySQL to use the X Protocol to speed up and monitor data replication.
E) MySQL Servers with Group Replication to replicate data to all members of the cluster.

5. Which query will find rows in a table that have no counterpart in another table?

A) SELECT t1.name, t2.name2FROM employee t1 INNER JOIN info t2 WHERE t1.name=t2.name;
B) SELECT left_tbl.*FROM left_tbl LEFT JOIN right_tbl ON left_tbl.id=right_tbl.idWHERE right_tbl.id IS NULL;
C) SELECT t1.name, t2.name2FROM employee AS t1 INNER JOIN info AS t2 ON t1.name= t2.name2;
D) SELECT *FROM table1 INNER JOIN table2 ON table1.id=table2.id WHERE table1.id=! table2.id;

Solutions: