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Oracle 1Z0-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

1. 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) 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.
C) mysqlbackup from MySQL Enterprise Backup allows logical backup with concurrency built in to get faster backup speed and restoration speed.
D) 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.
E) MySQL Enterprise Backup does not back up system data so that it is much faster.

2. How does MySQL HeatWave improve query performance?
Response:

A) By caching the entire database in memory.
B) By offloading analytics queries to an in-memory, highly parallel processing engine.
C) By replicating data across multiple servers.
D) By automatically creating indexes on frequently used columns.

3. Which three statements describe MySQL Enterprise Backup?

A) MySQL Enterprise Backup provides the point-in-time recovery functionality.
B) MySQL Enterprise Backup can be used to send backups to Oracle Cloud Infrastructure Storage Service.
C) MySQL Enterprise Backup offers backup based on Oracle RMAN with optimized row locking.
D) MySQL Enterprise Backup can be used to import/export data from on-premises MySQL installations.
E) MySQL Enterprise Backup is an optimized backup based on mysqldump with optimized row locking.

4. Which statement adds a column with the largest integer data type?

A) ALTER TABLE SCIENTIFIC ADD scientific_value DECIMAL(10,10);
B) ALTER TABLE SCIENTIFIC ADD scientific_value INTEGER;
C) ALTER TABLE SCIENTIFIC ADD scientific_value DECIMAL(15,10);
D) ALTER TABLE SCIENTIFIC ADD scientific_value BIGINT;

5. You need to load the MySQL Enterprise Audit plug-in at database startup and prevent the audit plug-in from being removed at run time.
Which two options should you include in the MySQL configuration file?

A) plugin-audit=ON, ALWAYS
B) audit_log_permanent=ON
C) audit-log=FORCE_PLUS_PERMANENT
D) LOAD PLUGIN=AUDIT_LOG
E) plugin-load=audit_log.so

Solutions: