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Topics of Oracle 1Z0-908: MySQL 8.0 Database Exam
The Oracle 1Z0-908 exam tests the abilities and knowledge of the candidates by checking the following objectives:
Architecture
- Understand and use the Data Dictionary
- Understand how MySQL stores data
- Understand how InnoDB stores data and logs
- Configure client connections to the server
- Configure buffers and caches
Server Installation and Configuration
- Launch multiple MySQL servers on the same host
- Configure MySQL variables
- Start and stop MySQL
Security
- Prevent SQL injection attacks
- Create user accounts and roles
- Recognize common security risks
- Encrypt MySQL data
- Provide the password and login security
- Use authentication plug-ins
Monitoring and Maintenance
- Use MySQL Enterprise Monitor to view activity in MySQL
- Configure MySQL Enterprise Audit
- Monitor MySQL processes and status
Query Optimization
- Analyze queries with MySQL Enterprise Monitor
- Create indexes to improve server performance
- Examine how MySQL optimizes queries
- Monitor and understand index statistics
Backups and Recovery
- Back up the binary log
- Explain when and how to use raw file backups
- Implement a backup strategy
High Availability Techniques
- Explain the role of replication threads
- Explain how replication provides high availability and scalability
- Configure replication
- Perform an InnoDB cluster recovery
- Describe MySQL InnoDB Cluster and Group Replication
- Configure multisource replication
Oracle 1Z0-908: MySQL 8.0 Database Administrator Exam is a valuable certification for individuals who work with MySQL databases. By demonstrating proficiency in database administration, individuals can increase their career opportunities and earning potential. With the right preparation and study resources, passing the exam can be a valuable achievement for any MySQL database administrator.
NEW QUESTION # 63
A colleague complains about slow response time on your website.
Examine this query and output:
What is the most likely cause for the high number of lock waits?
- A. The Innodb Buffer pool is full.
- B. You use the InnoDB storage engine and statements wait while data is inserted.
- C. You use the MyISAM storage engine for most common tables.
- D. Your table accesses wait for the operating system level flush.
Answer: B
NEW QUESTION # 64
You have an InnoDB Cluster configured with three servers.
Examine this command, which executes successfully:
mysqldump -uroot -p -d mydatabase > mydatabase_backup.sql
Due to data loss, the cluster is initialized and a restore is attempted resulting in this error:
ERROR 13176 (HY000) at line 23: Cannot update GTID_PURGED with the Group Replication plugin running Which two actions, either one of which, can fix this error and allow a successful restore of the cluster?
(Choose two.)
- A. Remove the group replication plugin from each instance before restoring.
- B. Stop all instances except the primary read/write master instance and run the restore.
- C. Restore using the --set-gtid-purged=OFF option.
- D. Remove the @@GLOBAL.gtid_purged statement from the dump file.
- E. Remove the @@GLOBAL.gtid_executed statement from the dump file.
- F. Create the backup by using the --set-gtid-purged=OFF option.
Answer: D,F
NEW QUESTION # 65
User account baduser@hostname on your MySQL instance has been compromised.
Which two commands stop any new connections using the compromised account? (Choose two.)
- A. ALTER USER baduser@hostname MAX_USER_CONNECTIONS 0;
- B. ALTER USER baduser@hostname IDENTIFIED WITH mysql_no_login;
- C. ALTER USER baduser@hostname ACCOUNT LOCK;
- D. ALTER USER baduser@hostname PASSWORD DISABLED;
- E. ALTER USER baduser@hostname DEFAULT ROLE NONE;
Answer: B,C
NEW QUESTION # 66
Examine this query:
What information does this query provide?
- A. total memory used by the first 10 connections
- B. total memory used by thread number 10
- C. total memory used by the first 10 threads
- D. total memory used across all connections associated with the user on connection number 10
- E. total memory used across all connections associated with the user on thread number 10
- F. total memory used by connection number 10
Answer: F
NEW QUESTION # 67
Your my.cnf file contains these settings:
You want to log queries that looked at a minimum of 5000 records and either took longer than 5 seconds to run or did not use indexes.
Which contains all the settings that you need to add to or modify the slow log configuration?
- A. long_query_time=5
log_throttle_queries_not_using_indexes=5
min_examined_row_limit=5000 - B. long_query_time=5
- C. log_throttle_queries_not_using_indexes=5
min_examined_ row_limit=5000 - D. log_throttle_queries_not_using_indexes=5
- E. min_examined_row_limit=5000
- F. long_query_time=5
log_throttle_queries_not_using_indexes=5 - G. long_query_time=5
min_examined_row_limit=5000
Answer: C
NEW QUESTION # 68
What does the binlog dump thread do?
- A. It connects to the master and asks it to send updates recorded in its binary logs.
- B. It reads the relay log and executes the events contained in them.
- C. It acquires a lock on the binary log for reading each event to be sent to the slave.
- D. It monitors and schedules the rotation/deletion of the binary logs.
Answer: A
NEW QUESTION # 69
You made some table definition changes to a schema in your MySQL Server.
Which two statements reflect how MySQL Server handles the table definition changes? (Choose two.)
- A. MySQL Server stores a copy of the serialized data in the InnoDB user tablespace.
- B. MySQL implicitly executes FLUSH TABLES and stores a snapshot backup of the metadata.
- C. MySQL keeps InnoDB metadata changes in .sdi files in datadir.
- D. MySQL writes SDI to the binary log for distributed backups.
- E. The metadata is serialized in JSON format in Serialized Dictionary Information (SDI).
Answer: A,E
NEW QUESTION # 70
Your MySQL server is running on the Microsoft Windows platform.
Which three local connection protocols are available to you? (Choose three.)
- A. UDP
- B. TCP/IP
- C. named pipes
- D. SOCKET
- E. X Protocol
- F. shared memory
Answer: B,C,F
NEW QUESTION # 71
Examine this statement, which executes successfully:
You want to improve the performance of this query:
Which change enables the query to succeed while accessing fewer rows?
- A. ALTER TABLE world.city ADD FULLTEXT INDEX (Name);
- B. ALTER TABLE world.city ADD SPATIAL INDEX (Population);
- C. ALTER TABLE world.city ADD INDEX (Population);
- D. ALTER TABLE world.city ADD INDEX (Name);
- E. ALTER TABLE world.city ADD SPATIAL INDEX (Name);
- F. ALTER TABLE world.city ADD FULLTEXT INDEX (Population);
Answer: B
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-indexes.html
NEW QUESTION # 72
You wish to store the username and password for a client connection to MySQL server in a file on a local file system.
Which is the best way to encrypt the file?
- A. Use mysql_config_editor to create an encrypted file.
- B. Use the AES_ENCRYPT() MySQL function on the option file.
- C. Use mysql_secure_installation to encrypt stored login credentials.
- D. Use a text editor to create a new defaults file and encrypt it from Linux prompt.
Answer: A
NEW QUESTION # 73
Examine this command and output:
Which two statements are true? (Choose two.)
- A. The lock is a shared lock.
- B. The lock is an exclusive lock.
- C. The lock is at the table object level.
- D. The lock is a row-level lock.
- E. The lock is at the metadata object level.
- F. The lock is an intentional lock.
Answer: B,C
NEW QUESTION # 74
Examine the modified output:
Seconds_Behind_ Mastervalue is steadily growing.
What are two possible causes? (Choose two.)
- A. The master is producing a large volume of events in parallel but the slave is processing them serially.
- B. The master is most probably too busy to transmit data and the slave needs to wait for more data.
- C. One or more large tables do not have primary keys.
- D. This value shows only I/O latency and is not indicative of the size of the transaction queue.
- E. The parallel slave threads are experiencing lock contention.
Answer: A,D
Explanation:
Explanation
NEW QUESTION # 75
Examine these statements, which execute successfully:
TRUNCATE test; BEGIN;
INSERT INTO test(id, name) VALUES(1, "Hello"); ROLLBACK;
SELECT id FROM test;
Which three storage engines would return a nonempty recordset for the test table when executing the statements? (Choose three.)
- A. MyISAM
- B. MEMORY
- C. ARCHIVE
- D. InnopB
- E. NDB
- F. BLACKHOLE
Answer: A,E,F
NEW QUESTION # 76
An existing asynchronous replication setup is running MySQL 8.
Which two steps are a part of implementing GTID replication? (Choose two.)
- A. Restart MySQL (master and slave) with these options enabled:
--gtid_mode=ON
--log-bin
--log-slave-updates
--enforce-gtid-consistency - B. Execute this on the slave to enable GTID:
START SLAVE IO_THREAD WITH GTID; - C. Enable GTID by executing this on the master and the slave:
SET GLOBAL GTID_ENABLED=on; - D. Execute this on the slave to enable GTID:
RESET SLAVE; START SLAVE GTID_NEXT=AUTOMATIC; - E. On the slave, alter the MySQL master connection setting with:
ALTER channel CHANGE MASTER TO MASTER_AUTO_POSITION = 1; - F. On the slave, alter the MySQL master connection setting with:
CHANGE MASTER TO MASTER_AUTO_POSITION = 1;
Answer: A,F
NEW QUESTION # 77
Which statement is true about MySQL Enterprise Transparent Data Encryption (TDE)?
- A. Lost tablespace encryption keys can be regenerated only if the master database key is known or present in the Key Vault specification.
- B. Both MyISAM and InnoDB tables can be encrypted by setting the keyring_engine = ALL variable in the MySQL configuration file.
- C. MySQL TDE uses an appropriate keyring plugin to store the keys in a centralized location.
- D. TDE can encrypt InnoDB and MyISAM tables only when the tables are stored in the SYSTEM tablespace.
Answer: A
NEW QUESTION # 78
You execute this command:
shell> mysqlpump --exclude-databases=% --users
Which statement is true?
- A. It creates a logical backup of all MySQL user accounts.
- B. It creates a logical backup of all metadata, but contains no table data.
- C. It creates a logical backup of only the users database.
- D. It returns an error because the mysqldump command should have been used.
Answer: A
Explanation:
Explanation
the command mysqlpump --exclude-databases=% --users creates a logical backup of all MySQL user accounts as CREATE USER and GRANT statements2. The option --exclude-databases=% excludes all databases from the backup, while the option --users includes all user accounts1.
NEW QUESTION # 79
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