MySQL 2021 Implementation Essentials: 1Z1-921 Exam
"MySQL 2021 Implementation Essentials", also known as 1Z1-921 exam, is a Oracle Certification. With the complete collection of questions and answers, ExamcollectionPass has assembled to take you through 78 Q&As to your 1Z1-921 Exam preparation. In the 1Z1-921 exam resources, you will cover every field and category in Oracle MySQL Certification helping to ready you for your successful Oracle Certification.
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- Exam Code: 1Z1-921
- Exam Name: MySQL 2021 Implementation Essentials
- Certification Provider: Oracle
- Corresponding Certification: Oracle MySQL
- Updated: Oct 14, 2026
- No. of Questions: 78 Questions & Answers with Testing Engine
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1Z1-921 Practice Q&A's
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Oracle 1Z1-921 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Backup, Recovery, and Replication | - Backup strategies - Replication concepts and configuration |
| Topic 2: MySQL Architecture and Installation | - Installation and configuration - MySQL server architecture |
| Topic 3: Security and User Management | - Authentication plugins (PAM, AD integration) - User accounts and privileges |
| Topic 4: Database Design and Development | - Schema design principles - Data types and normalization |
| Topic 5: Data Management and SQL Operations | - Indexing and optimization basics - SQL queries and DML operations |
| Topic 6: Monitoring and Troubleshooting | - Performance monitoring - Basic troubleshooting techniques |
Oracle MySQL 2021 Implementation Essentials Sample Questions:
You are using the innoDB engine and the innodb_f ile_per_table option is set.
You delete a significant number of rows of a large table named inventory and issue the command optimize table inventory.
What will happen to the inventory table?
- A. The table storage space will be reduced.
- B. The table statistics will be stored.
- C. The table will be checked for errors and repaired.
- D. The table will be optimized and replicated.
Correct Answer: D 🗳️
Which query will find rows in a table that have no counterpart in another table?
- A. SELECT left_tbl.*FROM left_tbl LEFT JOIN right_tbl ON left_tbl.id=right_tbl.idWHERE right_tbl.id IS NULL;
- B. SELECT t1.name, t2.name2FROM employee AS t1 INNER JOIN info AS t2 ON t1.name= t2.name2;
- C. SELECT *FROM table1 INNER JOIN table2 ON table1.id=table2.id WHERE table1.id=! table2.id;
- D. SELECT t1.name, t2.name2FROM employee t1 INNER JOIN info t2 WHERE t1.name=t2.name;
Correct Answer: A 🗳️
You need to change the password level for a test system.
Which two allow to change this level before you create new test user/passwords?
- A. SET GLOBAL force_password_complex_policy=0;
- B. SET GLOBAL validate_password_policy=,new level,;
- C. Add validate_password=,new level, in the [security] section of the MySQL configuration file.
- D. Add validate_password_policy=,new level, in the [mysqld] section of the MySQL configuration file.
Correct Answer: B,D 🗳️
Which three are recommended configurations for installing and running MySQL InnoDB Cluster?
- A. isolated machine resources
- B. use SSD,s for data and replication logs
- C. Groups must be in even numbers; 2, 4, 6, 8.
- D. Use Network-attached storage (NAS) for the data files.
- E. Networks must be in separate regions.
- F. The number of machines per group must be 3, 5, 7 or 9.
- G. smaller VM,s work best - with a maximum of eight vCPU,s and 16GB of RAM
Correct Answer: C,D,F 🗳️
Which two deployment architectures could you use for scaling-out database reads?
- A. Altering the storage engine for all tables to memory to increase performance.
- B. Changing the system setting with memory stickiness to true in order not to swap out mysq1dfrom memory.
- C. Implementing a three-node, single-primary InnoDB Cluster.
- D. Edit the configuration file and increase the value for parallel_read_workers and reboot the server
- E. Adding a memcached-tier for caching data and objects in RAM to reduce the number of times an external data source must be read.
Correct Answer: A,C 🗳️
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