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Oracle 1Z0-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

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

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

2. Which is true about inserting an additional line in a single document stored in MySQL document store?

A) Any new lines can only be inserted at the end of the document.
B) You specify the new element,s position in the JSON_ARRAY_INSERT statement.
C) The path specified must be an array position past the end of an array using the JSON_POSITION statement.
D) You cannot insert a single line, you have to replace the entire document with a new document.

3. Which component of MySQL Enterprise Monitor provides trend analysis and capacity planning for MySQL databases?
Response:

A) MySQL Advisors
B) MySQL Query Analyzer
C) Query Analyzer
D) MySQL Dashboard

4. Consider this SQL statement which is using the innoDB storage engine and with global AUTOCOMMIT = 1:

What is the result after issuing the rollback command?

A) Only the t2 table is created.
B) Both the tables, t1 and t2, are not created because there is an explicit ROLLBACK.
C) Both the tables, t1 and t2, are created.
D) Only the t1 table is created.

5. What are Security Lists in Oracle Cloud Infrastructure?

A) They are essentially firewall rules that help control traffic between OCI instances.
B) They allow administrators access to applications in the cloud and external servers.
C) They contain rules established by HIPAA for securing end-user data.
D) They are user-role designations that assign rights to certain internal users and external users.
E) Security lists are data encryption levels that control who can see the data.

Solutions: