Oracleは2025年最新の1Z0-921テスト解説（更新されたのは78問があります) [Q30-Q50]

Oracleは2025年最新の1Z0-921テスト解説（更新されたのは78問があります)

1Z0-921試験問題集を提供していますOracle問題

Oracle 1Z0-921（MySQL 2021 Implementation Essentials）試験は、MySQLデータベースの実装における専門知識を証明したいプロフェッショナル向けの認定プログラムです。この試験は、インストールと設定、セキュリティ管理、バックアップと復旧、パフォーマンス最適化、トラブルシューティングなど、MySQLデータベース実装の様々な側面についての候補者の知識とスキルをテストするように設計されています。この試験は、MySQLに強い基盤を持ち、潜在的な雇用主に技術的なスキルと知識を示したい個人を対象としています。

 

質問 # 30
Which two statements about the download of MySQL Enterprise Backup are correct?

• A. MySQL Enterprise Backup can be downloaded from My Oracle Support (MOS).
• B. MySQL Enterprise Backup comes with MySQL Connector and is freely available for download.
• C. MySQL Enterprise Backup is a separate package from MySQL Enterprise Edition. It can be downloaded from https://edelivery.oracle.com.
• D. MySQL Enterprise Backup comes with MySQL Utilities Package, which is available for download publicly on http://www.mysql.com.
• E. MySQL Enterprise Backup comes with all MySQL editions including community edition.

正解：C、E

質問 # 31
Which statement will display the status of the partitioning plug-in?

• A. USE SYS SCHEMA; SHOW PLUGINS STATUS;
• B. SHOW STATUS PLUGINS WHERE Name= 'PARTITIONING';
• C. SHOW PLUGINS WHERE Name= 'partition';
• D. SELECT PLUGIN_NAME, PLUGIN_VERSION, PLUGIN_STATUS FROM INFOMRATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME= 'partition';

正解：D

質問 # 32
Which two methods help prevent MySQL security risks?

• A. Use the secure installation script "mysql_alays_secure_installation".
• B. Use a firewall to control access to MySQL ports.
• C. Grant only permissions that a user requires.
• D. Allow unauthorized clients to connect to the server.
• E. Ensure that MySQL accounts have short and easy passwords.
• F. Transmit plain (unencrypted) data over networks.

正解：D、F

質問 # 33
When should you perform a backup in a MySQL database?
Response:

• A. Only when the database size exceeds a certain limit.
• B. Only during scheduled maintenance windows.
• C. After critical data updates or before making significant changes to the database.
• D. After every successful query execution.

正解：C

質問 # 34
You are testing a new application and want to use data masking but the database is empty. What option will generate dummy data for you to use for testing?

• A. Alter the table with the statement: ALTER TABLE IMPORT DATA WITH data_masking plugin;
• B. Use mysqldump to import data from the sakila_dummy database sample data set.
• C. Use MySQL Enterprise High Availability to access one of the available data tables
• D. Execute the sakila-data. sqi script to populate the database

正解：A

質問 # 35
You establish MySQL Enterprise Server on Oracle Cloud Infrastructure connection via Secure Shell (SSH).
When accessing a new MySQL Enterprise Edition Oracle Cloud Infrastructure (OCI) instance, you want to use MySQL Enterprise Workbench for SQL and remote management.
What are two ways to successfully configure Workbench based on the MySQL access credentials?

• A. Open the MySQL OCI instance access port 3306. For the MySQL connection, you use this port, and, in addition, you configure the remote management based on SSH based on the provided key.
• B. Configure the MySQL Router first and based on those settings, you access your MySQL CS instance.
• C. Convert the private key to ppk format first. Based on TCP/IP over SSH and based on the created private key, opc-user, and MySQL access credentials, you can access the MySQL CS instance.
• D. Configure TCP/IP over SSH and based on the created private key, opc-User, and MySQL access credentials, you can access the MySQL OCI instance.

正解：A

質問 # 36
Which features of MySQL Enterprise Edition should you use to proactively monitor and track data changes in your databases?

• A. MySQL Audit and MySQL Workbench
• B. SQL Enterprise Monitor and MySQL Enterprise Authentication
• C. MySQL Enterprise Monitor and MySQL Audit
• D. MySQL Workbench and MySQL Enterprise Firewall

正解：B

質問 # 37
An Oracle Cloud Infrastructure customer already has many database instances configured and running in the cloud; however, they are reporting that they are unable to create any more instances.
What could be the problem?

• A. The customer does not have proper user rights.
• B. The customer has not kept up with their patching requirements; new instances cannot be created unless the majority or the template of existing instances are up-to-date.
• C. The customer account might have reached resource quota/limits.
• D. The customer reached the database instance limit of 32.

正解：D

質問 # 38
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. Execute the purge binary logs statement without argument.
• B. Set the expire_logs_days system variable to expire binary log files automatically after a given number of days.
• C. To safely purge binary log files, perform these steps:
• D. Delete all binlog files manually on the file system to release storage spaces.
• E. On the Master server, disable binlog by removing the --log-bin option.

正解：B、C

質問 # 39
Which three installation options are available for installing the MySQL Enterprise Monitor/Agent on Linux?

• A. A script (with an option file) for installing MySQL Enterprise Monitor, Agent, and a MySQL Repository database
• B. A CLI-based wizard MySQL Enterprise Monitor, Agent, and a MySQL Repository database
• C. A browser-based wizard to remotely deploy the MySQL Monitor Agent
• D. A MySQL Enterprise Monitor to remotely deploy the MySQL Monitor Agent
• E. A GUI for installing MySQL Enterprise Monitor, Agent, and a MySQL Repository database

正解：A、B、E

質問 # 40
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;

正解：C

質問 # 41
You have created your Compute instance using an Oracle-provided Oracle Linux image.
You want to log in to your OCI Compute instance using SSH. Which three items do you need for this process?

• A. Public IP address
• B. SSH private key
• C. User Password
• D. The opc user
• E. SSH public key
• F. The root user

正解：D

質問 # 42
Which statement would you use to remove the population column from the city table?

• A. DELETE population FROM city;
• B. DROP population FROM city;
• C. ALTER TABLE city LESS population;
• D. ALTER TABLE city DELETE population;
• E. ALTER TABLE city DROP population;

正解：E

質問 # 43
Which three options are valid reasons for using a primary key in a table?

• A. to make it easier to change the PRIMARY KEY value
• B. automatic storage of data in a sorted order
• C. increasing performance when using select statements
• D. exporting data faster with mysqldump
• E. maintaining a history of row insertions or updates
• F. preventing duplicate keys

正解：C、D、F

質問 # 44
You have a MySQL Server instance (running with Port# 3306) monitored by the Service Manager in MySQL Enterprise Monitor. You cloned the MySQL Database instance and configured it to be a replicated MySQL instance as Slave using Port# 3316 on the same machine as the Master Server. The replication configuration is working correctly. The Master and Slave Servers are running.
You are trying to add the newly created MySQL Slave instance to the Monitor. The Service Manager in MySQL Enterprise Monitor notifies you that the new instance is successfully added; however, it is not added correctly at the newly added configuration points to the old Master monitored items. The Monitor shows only one monitored MySQL instance for Master and Slave.
Which two are possible reasons for this problem?

• A. The mysql.instance table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
• B. The MASTER and SLAVE are grouped as one instance for monitoring.
• C. All the MySQL instances (Master and Slave) have the same server_uuid in <datadir>/auto.cnf.
• D. The mysql.inventory table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
• E. The SLAVE and MASTER instances are started with the same configured value for the option - - monitor_server_uuid.

正解：A、B

質問 # 45
Which four authentication protocols are allowed when using MySQL Enterprise Authentication?

• A. authentication using SHA-256 password hashing
• B. authentication via Pluggable Authentication Modules (PAMs)
• C. connections through the local host via the UNIX socket file
• D. Native Windows services
• E. SECURID authentication and authorization identity
• F. Simple Authentication and Security Layer

正解：A、B、C、D

質問 # 46
Which is a correct example of creating an Enterprise Encryption function?

• A. SET @function = CREATE_ASYMMETRIC_PRIV_KEY(@algo, @key_len);
• B. VALIDATE FUNCTION create_asymmetric_priv_key WITH ,openssl_udf.so';
• C. CREATE FUNCTION asymmetric_decrypt RETURNS STRING SONAME ,openss1_udf.so,;
• D. INSERT INTO t1 (key_co1) FUNCTION(CREATE_ASYMMETRIC_PRIV_KEY(,RSA,, 1024));

正解：C

質問 # 47
How would you restrict a user Joe from accessing all MySQL database objects?

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

正解：C

質問 # 48
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. Cloud tape library
• B. Both Cloud storage and local storage
• C. Cloud storage only
• D. Flash-archive recovery area

正解：B、C

質問 # 49
How does MySQL HeatWave improve query performance?
Response:

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

正解：B

質問 # 50
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