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Oracle 1Z1-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

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

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

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

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

3. Which two statements are true about MySQL Enterprise Firewall?

A) Server-side plug-ins named MYSQL_FIREWALL_USERS and MYSQL_FIREWALL-WHITELIST implement INFORMATION_SCHEMA tables that provide views into the firewall data cache.
B) On Windows systems, MySQL Enterprise Firewall is controlled and managed by using the Windows Internet Connection Firewall control panel.
C) MySQL Enterprise Firewall is available only in MySQL Enterprise versions 5.7.10.and later.
D) System tables named firewall_users and firewall_whitelist in the mysql database provide persistent storage of firewall data.
E) MySQL Enterprise Firewall shows only notifications blocked connections, which originated outside of your network's primary domain.
F) The firewall functionality is dependent upon SHA-256 and ANSI-specific functions built in to the mysql.firewall table. These functions cannot be deleted, even by the root user.

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

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

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

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