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Oracle 1Z1-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

1. How would you restrict a user Joe from accessing all MySQL database objects?

A) Insert Joe,s name into the mysql.user_restriction cable, and issue the FLUSH PRIVILEGES command.
B) CREATE USER ,joe'@,0.0.0.0, SET Password=PASSWORD(,% ! %,)
C) UPDATE mysql.user SET Password=PASSWORD(,Invalid,) WHERE User=,joe';
D) REVOKE ALL PRIVILEGES, GRANT OPTION FROM ,joe,@,%,;
E) CREATE USER , joe,@1' %' DENY ALL PRIVILEGES

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

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

3. What SQL keyword must be specified when creating a foreign key constraint?

A) the SET_FOREGIN variable in the my .cnf file
B) a REFERENCES in the child table to the parent table
C) a TRIGGER on the child table for cascading delete statements
D) unique PRIMARY key values for both child and parent tables
E) an index on the foreign key

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

5. Which three are characteristics of the JSON data type?

A) Key or array references enable quick read-access to look up document elements directly.
B) It is based on the TEXT data type.
C) A set of SQL functions substantially support the SQL utilization of the data type.
D) It supports indexing directly against the JSON-defined column.
E) Comparisons of JSON values are not case-sensitive.
F) It validates the JSON syntax on insert or merge.

Solutions: