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NEW QUESTION # 149
What is the default binary log format used by MySQL for replication?
- A. STATEMENT
- B. ROW
- C. TABLE
- D. MIXED
Answer: B
Explanation:
The default binary log format in MySQL is ROW. This format logs changes at the row level, meaning that individual changes to each row of a table are recorded. This approach provides more consistency and accuracy during replication, especially with complex queries.
NEW QUESTION # 150
Which two commands can be used to restore a MySQL database from a backup?
- A. mysql --restore
- B. mysqlbackup --apply-log
- C. mysql < backup.sql
- D. mysql --start-replication
Answer: B,C
Explanation:
The mysql < backup.sql command is used to restore a database from a logical backup created by mysqldump. The mysqlbackup command with the --apply-log option is used to prepare a physical backup for restoration.
NEW QUESTION # 151
Which MySQL feature allows an organization to track user activities for regulatory compliance, such as GDPR or HIPAA?
- A. MySQL InnoDB Cluster
- B. MySQL Enterprise Backup
- C. MySQL Enterprise Audit
- D. MySQL Query Optimizer
Answer: C
Explanation:
MySQL Enterprise Audit logs user activities and access to ensure that organizations can track database operations and meet regulatory compliance standards, such as GDPR or HIPAA.
NEW QUESTION # 152
Which feature in MySQL Enterprise Edition ensures that backups can be created without locking tables?
- A. MySQL Enterprise Backup
- B. MySQL Enterprise Firewall
- C. MySQL Dump
- D. MySQL Shell
Answer: A
Explanation:
MySQL Enterprise Backup allows for online backups without locking tables, ensuring that the database remains available for transactions during the backup process, which is a significant advantage over traditional mysqldump.
NEW QUESTION # 153
Which of the following is a core requirement for setting up a MySQL InnoDB Cluster?
- A. Query caching must be turned off
- B. Binary log and GTID must be enabled
- C. Full-text indexing must be active
- D. Only one node can act as a primary
Answer: B
Explanation:
A core requirement for setting up a MySQL InnoDB Cluster is that binary logs and Global Transaction Identifiers (GTIDs) must be enabled. These are necessary for tracking and applying transactions consistently across all nodes in the cluster.
NEW QUESTION # 154
Which command is used to shut down the MySQL server on a Linux system?
- A. mysqladmin --stop
- B. systemctl stop mysqld
- C. mysql shutdown
- D. service mysql-server shutdown
Answer: B
Explanation:
On most Linux distributions, you can stop the MySQL server using the systemctl stop mysqld command, which sends a shutdown signal to the MySQL service.
NEW QUESTION # 155
Which type of replication topology would you use to enable read scaling by distributing read queries across multiple replicas?
- A. Primary-replica replication
- B. Circular replication
- C. Star replication
- D. Multi-primary replication
Answer: A
Explanation:
In a Primary-Replica replication topology, read queries can be distributed across multiple replicas to enable read scaling, while all write operations are directed to the primary server.
NEW QUESTION # 156
Which command is used to stop MySQL replication on a replica server?
- A. STOP REPLICA;
- B. END REPLICATION;
- C. STOP SLAVE;
- D. HALT REPLICATION;
Answer: C
Explanation:
The STOP SLAVE; command is used to halt replication on a MySQL replica server. This stops the replica from receiving and applying updates from the primary server.
NEW QUESTION # 157
Which two settings can be configured in my.cnf to optimize the performance of MySQL?
- A. query_cache_size
- B. binlog_format
- C. max_connections
- D. innodb_buffer_pool_size
Answer: C,D
Explanation:
innodb_buffer_pool_size optimizes data caching, and max_connections helps handle concurrent connections, both critical for performance tuning. binlog_format is related to replication, not performance.
NEW QUESTION # 158
Which file format should be used to store InnoDB table data separately from the shared tablespace?
- A. .ibd
- B. .frm
- C. .MYD
- D. .csv
Answer: A
Explanation:
InnoDB tables can store their data in separate .ibd files if the innodb_file_per_table option is enabled. These files contain both the table data and indexes for each table.
NEW QUESTION # 159
Which MySQL command is used to perform a logical backup using the mysqldump utility?
- A. mysqlbackup --backup-log
- B. mysqldump --all-databases > backup.sql
- C. mysqlbackup --dump
- D. mysqldump --backup-databases
Answer: B
Explanation:
The mysqldump utility is used to perform logical backups by exporting databases into SQL files. The command mysqldump --all-databases > backup.sql dumps all databases to the specified backup file.
NEW QUESTION # 160
Which of the following describes a key feature of MySQL Enterprise Firewall?
- A. Real-time query encryption
- B. Performing database backups
- C. Learning and blocking unauthorized SQL statements
- D. Improving query execution time
Answer: C
Explanation:
MySQL Enterprise Firewall learns legitimate SQL query patterns by analyzing traffic and then blocks unauthorized or suspicious queries in real time, thus providing protection against threats like SQL injection attacks.
NEW QUESTION # 161
How does MySQL InnoDB Cluster prevent split-brain scenarios during network partitioning?
- A. By using only one primary server at a time
- B. By using quorum-based decision-making in Group Replication
- C. By relying on asynchronous replication
- D. By stopping all nodes until manual intervention
Answer: B
Explanation:
MySQL InnoDB Cluster uses quorum-based decision-making in Group Replication to prevent split-brain scenarios. This ensures that only a majority of nodes (the quorum) can make decisions about transaction commits and primary promotions, preventing conflicting data changes during network partitioning.
NEW QUESTION # 162
Which MySQL backup type requires less storage space and is faster because it backs up only the changed data since the last backup?
- A. Logical backup
- B. Cold backup
- C. Incremental backup
- D. Full backup
Answer: C
Explanation:
An incremental backup backs up only the data that has changed since the last backup (either full or incremental), reducing storage space and speeding up the backup process, especially for large databases.
NEW QUESTION # 163
Which MySQL feature is specifically designed to handle read scaling in a MySQL InnoDB Cluster?
- A. MySQL Query Cache
- B. MySQL Router with read/write split
- C. Asynchronous replication
- D. Multi-primary replication
Answer: B
Explanation:
MySQL Router can be configured to handle read/write splitting, directing read queries to replicas and write queries to the primary server. This improves read scaling in a MySQL InnoDB Cluster.
NEW QUESTION # 164
Which command would you use to remove a user from the MySQL system?
- A. REVOKE 'user'@'host';
- B. ALTER USER 'user'@'host';
- C. DELETE USER 'user'@'host';
- D. DROP USER 'user'@'host';
Answer: D
Explanation:
The DROP USER statement is used to remove a user from the MySQL system, including all their privileges.
NEW QUESTION # 165
What is the maximum length of a VARCHAR column in MySQL?
- A. 1,000 characters
- B. 32,767 characters
- C. 65,535 characters
- D. 255 characters
Answer: C
Explanation:
The VARCHAR datatype can store up to 65,535 characters. This limit depends on the maximum row size and the character set used.
NEW QUESTION # 166
Which command is used to change the definition of a table after it has been created?
- A. MODIFY TABLE
- B. UPDATE TABLE
- C. ALTER TABLE
- D. CHANGE TABLE
Answer: C
Explanation:
The ALTER TABLE command is used to change the structure of an existing table, such as adding or modifying columns or constraints.
NEW QUESTION # 167
Which command would you use to monitor replication status on a replica server?
- A. SHOW REPLICATION;
- B. SHOW SLAVE STATUS;
- C. EPLICATE STATUS;
- D. SHOW REPLICA STATUS; R
Answer: B
Explanation:
The SHOW SLAVE STATUS; command provides detailed information about the status of replication on a replica server, including the binary log position, relay log position, and any errors encountered.
NEW QUESTION # 168
Which of the following replication topologies allows for multi-master replication where updates can be made on multiple servers?
- A. Circular replication
- B. Primary-replica
- C. Group replication
- D. Multi-primary replication
Answer: D
Explanation:
Multi-primary replication (or multi-master replication) allows updates to be made on multiple servers, and those updates are propagated to the other servers in the replication group.
NEW QUESTION # 169
Which of the following components is responsible for handling user authentication in MySQL?
- A. Connection Manager
- B. Storage Engine
- C. MySQL Server
- D. Query Optimizer
Answer: C
Explanation:
The MySQL Server is responsible for handling user authentication, managing user accounts, and verifying permissions before processing queries. It is distinct from the storage engines that handle data.
NEW QUESTION # 170
Which MySQL datatype would be most appropriate for storing a social security number?
- A. VARCHAR
- B. INT
- C. FLOAT
- D. DECIMAL
Answer: A
Explanation:
VARCHAR is the best datatype for storing a social security number because it often contains non- numeric characters such as hyphens, and the number itself is not used in calculations.
NEW QUESTION # 171
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