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

2. When using an Oracle Cloud Infrastructure Compute Instance with MySQL Enterprise Edition installed, you have two choices for backup destinations. What are these two choices?

A) Flash-archive recovery area
B) Cloud tape library
C) Cloud storage only
D) Both Cloud storage and local storage

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

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

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

5. The replication for a Master and Slave MySQL Servers is up and running. The disk space for Master Server is continuously growing. The binlog size keeps growing. Which two methods can fix the issue?

A) On the Master server, disable binlog by removing the --log-bin option.
B) Delete all binlog files manually on the file system to release storage spaces.
C) Set the expire_logs_days system variable to expire binary log files automatically after a given number of days.
D) To safely purge binary log files, perform these steps:
E) Execute the purge binary logs statement without argument.

Solutions: