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MySQL Database Administration 1Z0-908 Exam Practice Test Questions Dumps Bundle!
Introduction to Oracle 1Z0-908: MySQL 8.0 Database Administrator Exam
Oracle 1Z0-908: MySQL 8.0 Database Administrator Administration Exam assesses the abilities of the Database Administrators and System Administrators who have at least 1 year of experience in RAC and Grid Infrastructure. The candidates should have the ability to install, manage, tracking, tuning, and restoring RAC databases, cluster, and Oracle Automatic Storage Management (ASM). They should have a good understanding of the architectures of the ASM, Clusterware, and Oracle RAC databases. They should also know how to install, setup, backup, and recovery monitoring and tuning of these components.
Oracle Real Application Clusters (RAC) in database computing is a choice for Oracle Database software developed by Oracle Corporation, it provides clustering software and high availability in Oracle database environments. With the Enterprise Version, Oracle Corporation includes RAC, provided the nodes are clustered using Oracle Clusterware. Oracle RAC allows several machines when accessing a single database, to run Oracle RDBMS software simultaneously, offering to cluster.
The Oracle Grid Infrastructure for an independent server is the Oracle software that offers system support for a database including the file system, volume management, and automation of the restart process. If you want to utilize the Oracle restart or Oracle Automatic Storage Management (ASM) services, you have to install Oracle grid infrastructure before installing Oracle Database.
How to book the Oracle 1Z0-908: MySQL 8.0 Database Exam
If you are looking to appear in the Oracle 1Z0-908: MySQL 8.0 Database Exam, you can do so by either redeeming a voucher that you must buy from Oracle or paying directly with a credit card. After payment, you can schedule the test via Oracle’s external testing provider, PearsonVue.
NEW QUESTION 11
What does the binlog dump thread do?
- A. It reads the relay log and executes the events contained in them.
- B. It monitors and schedules the rotation/deletion of the binary logs.
- C. It acquires a lock on the binary log for reading each event to be sent to the slave.
- D. It connects to the master and asks it to send updates recorded in its binary logs.
Answer: D
NEW QUESTION 12
Examine this statement:
mysql> DROP ROLE r_role1, r_role2;
Which two are true? (Choose two.)
- A. It fails if you do not have the ADMIN OPTION of the roles r_role1 and r_role2.
- B. It fails if any of the roles is specified in the mandatory_roles variable.
- C. It fails if at least one of the roles does not exist.
- D. You must revoke all privileges from r_role1 and r_role2 before dropping the roles.
- E. Existing connections can continue to use the roles' privileges until they reconnect.
- F. You must revoke r_role1 and r_role2 from all users and other roles before dropping the roles.
Answer: A,E
NEW QUESTION 13
An attempt to recover an InnoDB Cluster fails.
Examine this set of messages and responses:
host3:3377 ssl JS > dba.rebootClusterFromCompleteOutage() Reconfiguring the default cluster from complete outage...
The instance 'host1:3377'' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y The instance 'host2:3377' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y Dba.rebootClusterFromCompleteOutage: The active session instance isn't the most updated in comparison with the ONLINE instances of the Cluster's metadat a. Please use the most up to date instance: 'host1:3377'. (RuntimeError) Which statement is true?
- A. The instance deployed on host3 must be synchronized from a donor deployed on host1 by using the command cluster.addInstance('host1:3377').
- B. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
- C. The instance deployed on host3 must be rebuilt with a backup from the primary instance.
- D. The cluster is running and there is at least one ONLINE instance.
- E. The active session instance is invalid and must be re-created by using the command shell.connect ('host3:3377').
Answer: A
NEW QUESTION 14
You are upgrading a MySQL instance to the latest 8.0 version.
Examine this output:
You plan to add this parameter to the configuration:
innodb_directories=’/innodb_extras’
Which statement is true?
- A. It is not necessary because innodb_data_home_diris already defined.
- B. It defines all innodb tablespace options relative to a starting parent directory.
- C. It adds more temporary workspace in addition to the innodb_tmpdirlocation.
- D. It allows scanning of other locations to discover more innodb tablespaces.
- E. It moves all innodb tablespaces to the /innodb_extrasdirectory to enable a new innodb_data_home_dirto be defined.
Answer: A
NEW QUESTION 15
Examine these statements, which execute successfully:
CREATE ROLE r_world_rd;
GRANT SELECT ON world.* TO r_world_rd;
CREATE USER john IDENTIFIED BY 'P@ssw0rd';
GRANT r_world_rd TO john;
Examine these statements issued by user John:
What is the reason for the error?
- A. The DBA needs to execute FLUSH PRIVILEGES.
- B. John has not activated the role.
- C. John needs to reconnect to the database.
- D. The statement was blocked by MySQL Firewall.
Answer: B
NEW QUESTION 16
You are backing up raw InnoDB files by using mysqlbackup.
Which two groups of files will be backed up during a full backup? (Choose two.)
- A. *.sdifiles
- B. *.ibdfiles
- C. *.CSMfiles
- D. ib_logfile*files
- E. ibbackupfiles
Answer: B,D
Explanation:
Explanation/Reference:
Reference: https://dev.mysql.com/doc/mysql-backup-excerpt/5.7/en/innodb-backup.html
NEW QUESTION 17
Which two MySQL Shell commands are excluded from the InnoDB Cluster creation procedure? (Choose two.)
- A. dba.createCluster()
- B. cluster.addInstance()
- C. cluster.setPrimaryInstance()
- D. dba.configureLocalInstance()
- E. dba.configureInstance()
- F. dba.checkInstanceConfiguration()
- G. cluster.forceQuorumUsingPartitionOf()
Answer: C,G
Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-shell-8.0-relnotes-en/news-8-0-16.html
NEW QUESTION 18
Examine this command and output:
Which two options will improve the security of the MySQL instance? (Choose two.)
- A. Remove world read privileges from the server-cert.pemcertificate file.
- B. Remove the world read/execute privilege from the accountingdirectory.
- C. Remove world read privileges from the public_key.pemfile.
- D. Change the parent directory owner and group to mysql.
- E. Change the group ownership of the mysqldirectory to the mysqluser group.
- F. Remove group read/write privileges from the private_key.pemfile.
Answer: D,E
NEW QUESTION 19
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. The metadata is serialized in JSON format in Serialized Dictionary Information (SDI).
- D. MySQL keeps InnoDB metadata changes in .sdi files in datadir.
- E. MySQL writes SDI to the binary log for distributed backups.
Answer: A,C
NEW QUESTION 20
You must run multiple instances of MySQL Server on a single host.
Which three methods are supported? (Choose three.)
- A. Start mysqld or mysqld_safe using different option files for each instance.
- B. Run MySQL Server docker containers.
- C. Use systemd with different settings for each instance.
- D. Use resource groups to lock different instances on separate CPUs.
- E. Run mysqld with --datadir defined for each instance.
- F. Use system tools to lock each instance to its own CPU.
Answer: A,C,E
NEW QUESTION 21
Examine this command, which executes successfully:
cluster.addInstance('<user>@<host>:<port>', {recoveryMethod: 'clone'})
Which three statements are true? (Choose three.)
- A. It is always slower than {recoveryMethod: 'incremental'}.
- B. The account used to perform this recovery needs the BACKUP_ADMIN privilege.
- C. A target instance must exist, then it will be provisioned with data from an instance already in the cluster and joined to the cluster.
- D. A new instance is installed, initialized, and provisioned with data from an instance already in the cluster and joined to the cluster.
- E. InnoDB tablespaces outside the datadir are able to be cloned.
- F. InnoDB redo logs must not rotate for the duration of the execution; otherwise, the recovery will fail.
Answer: A,B,F
NEW QUESTION 22
The data in this instance is transient; no backup or replication will be required. It is currently under performing.
* The database size is static and including indexes is 19G.
* Total system memory is 32G.
After profiling the system, you highlight these MySQL status and global variables:
The OS metrics indicate that disk is a bottleneck.
Other variables retain their default values.
Which three changes will provide the most benefit to the instance? (Choose three.)
- A. innodb_log_file_size=1G
- B. innodb_flush_log_at_trx_commit=1
- C. sync_binlog=0
- D. innodb_undo_directory=/dev/shm
- E. max_connections=10000
- F. buffer_pool_size=24G
- G. innodb_doublewrite=0
Answer: A,B,E
Explanation:
Explanation/Reference: https://aws.amazon.com/blogs/database/best-practices-for-configuring-parameters-for-amazon- rds-for-mysql-part-1-parameters-related-to-performance/
NEW QUESTION 23
Which two commands will display indexes on the partstable in the manufacturing schema? (Choose two.) \
- A. SHOW INDEXES FROM manufacturing.parts;
- B. SELECT * FROM information_schema.COLUMN_STATISTICS;
- C. EXPLAIN SELECT INDEXES FROM manufacturing.parts;
- D. SELECT * FROM information_schema.statistics WHERE table_schema=’manufacturing’
AND TABLE_NAME=’parts’; - E. DESCRIBE manufacturing.parts;
Answer: B,D
Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E11882_01/server.112/e40540/indexiot.htm#CNCPT912
NEW QUESTION 24
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 IDENTIFIED WITH mysql_no_login;
- B. ALTER USER baduser@hostname MAX_USER_CONNECTIONS 0;
- C. ALTER USER baduser@hostname DEFAULT ROLE NONE;
- D. ALTER USER baduser@hostname PASSWORD DISABLED;
- E. ALTER USER baduser@hostname ACCOUNT LOCK;
Answer: A,E
NEW QUESTION 25
You wish to protect your MySQL database against SQL injection attacks.
Which method would fail to do this?
- A. using PREPARED STATEMENTS
- B. avoiding concatenation of SQL statements and user-supplied values in an application
- C. installing and configuring the Connection Control plugin
- D. using stored procedures for any database access
Answer: D
NEW QUESTION 26
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. On the slave, alter the MySQL master connection setting with:
ALTER channel CHANGE MASTER TO MASTER_AUTO_POSITION = 1; - C. Enable GTID by executing this on the master and the slave:
SET GLOBAL GTID_ENABLED=on; - D. On the slave, alter the MySQL master connection setting with:
CHANGE MASTER TO MASTER_AUTO_POSITION = 1; - E. Execute this on the slave to enable GTID:
RESET SLAVE; START SLAVE GTID_NEXT=AUTOMATIC; - F. Execute this on the slave to enable GTID:
START SLAVE IO_THREAD WITH GTID;
Answer: A,D
NEW QUESTION 27
You wish to protect your MySQL database against SQL injection attacks.
Which method would fail to do this?
- A. using PREPARED STATEMENTS
- B. avoiding concatenation of SQL statements and user-supplied values in an application
- C. installing and configuring the Connection Control plugin
- D. using stored procedures for any database access
Answer: D
Explanation:
Explanation/Reference: https://www.ptsecurity.com/ww-en/analytics/knowledge-base/how-to-prevent-sql-injection-attacks/
NEW QUESTION 28
Examine this command, which executes successfully:
$ mysqlrouter --bootstrap user@hostname:port --directory=directory_path Which activity is performed?
- A. MySQL Router configures itself based on the information retrieved from the InnoDB cluster metadata server.
- B. MySQL Router is configured based on the information in files in directory_path.
- C. MySQL Router configures all the cluster nodes based on the information retrieved from the InnoDB cluster metadata server.
- D. MySQL Router is restarted.
Answer: A
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/mysql-router/8.0/en/mysqlrouter.html
NEW QUESTION 29
On examination, your MySQL installation datadir has become recursively world read/write/executable.
What are two major concerns of running an installation with incorrect file privileges? (Choose two.)
- A. Data files could be deleted.
- B. Extra startup time would be required for the MySQL server to reset the privileges.
- C. Users could overwrite configuration files.
- D. MySQL binaries could be damaged, deleted, or altered.
- E. SQL injections could be used to insert bad data into the database.
Answer: A,B
NEW QUESTION 30
Your MySQL server is running on the Microsoft Windows platform.
Which three local connection protocols are available to you? (Choose three.)
- A. UDP
- B. X Protocol
- C. shared memory
- D. SOCKET
- E. named pipes
- F. TCP/IP
Answer: C,E,F
Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-8.0-en/mysql-installer-workflow.html
NEW QUESTION 31
Which two are contained in the InnoDB system tablespace (ibdata1) by default? (Chose two.)
- A. primary indexes
- B. user privileges
- C. InnoDB Data Dictionary
- D. table data
- E. change buffer
- F. doublewrite buffer
Answer: C,F
NEW QUESTION 32
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