PDF (New 2022) Actual Oracle 1z1-908 Exam Questions
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NEW QUESTION 17
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 active session instance is invalid and must be re-created by using the command shell.connect ('host3:3377').
- B. The instance deployed on host3 must be synchronized from a donor deployed on host1 by using the command cluster.addInstance('host1:3377').
- C. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
- D. The instance deployed on host3 must be rebuilt with a backup from the primary instance.
- E. The cluster is running and there is at least one ONLINE instance.
Answer: B
NEW QUESTION 18
Examine this statement:
mysql> DROP ROLE r_role1, r_role2;
Which two are true? (Choose two.)
- A. It fails if any of the roles is specified in the mandatory_roles variable.
- B. Existing connections can continue to use the roles' privileges until they reconnect.
- C. It fails if you do not have the ADMIN OPTION of the roles r_role1 and r_role2.
- D. You must revoke all privileges from r_role1 and r_role2 before dropping the roles.
- E. It fails if at least one of the roles does not exist.
- F. You must revoke r_role1 and r_role2 from all users and other roles before dropping the roles.
Answer: B,C
NEW QUESTION 19
What does the binlog dump thread do?
- A. It acquires a lock on the binary log for reading each event to be sent to the slave.
- B. It reads the relay log and executes the events contained in them.
- C. It monitors and schedules the rotation/deletion of the binary logs.
- D. It connects to the master and asks it to send updates recorded in its binary logs.
Answer: D
NEW QUESTION 20
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. ib_logfile*files
- C. *.CSMfiles
- D. *.ibdfiles
- 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 21
Examine this query and output:
Which two statements are true? (Choose two.)
- A. The query returns exactly 125 rows.
- B. It takes more than 8 milliseconds to sort the rows.
- C. 35 rows from the city table are included in the result.
- D. The country table is accessed as the first table, and then joined to the city table.
- E. The optimizer estimates that 51 rows in the country table have Continent = 'Asia'.
Answer: C,E
NEW QUESTION 22
Which two are use cases of MySQL asynchronous replication? (Choose two.)
- A. It allows backup to be done on the slave without impacting the master.
- B. It guarantees near real-time replication between a master and a slave.
- C. MySQL Enterprise Backup will automatically back up from an available slave.
- D. You can scale reads by adding multiple slaves.
- E. You can scale writes by creating a replicated mesh.
Answer: A,D
NEW QUESTION 23
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_doublewrite=0
- B. innodb_undo_directory=/dev/shm
- C. innodb_flush_log_at_trx_commit=1
- D. sync_binlog=0
- E. max_connections=10000
- F. buffer_pool_size=24G
- G. innodb_log_file_size=1G
Answer: C,E,G
NEW QUESTION 24
You have configured GTID-based asynchronous replication with one master and one slave.
A user accidentally updated some data on the slave.
To fix this, you stopped replication and successfully reverted the accidental changes. Examine the current GTID information:
You must fix GTID sets on the slave to avoid replicating unwanted transactions in case of failover. Which set of actions would allow the slave to continue replicating without erroneous transactions?
- A. RESET MASTER;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167; - B. RESET SLAVE;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167; - C. SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-2312,bbbbbbbb- bbbb-bbbb-bbbb-bbbbbbbbbbbb:1-9; SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167;
- D. RESET SLAVE;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-3820;
SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10300; - E. RESET MASTER;
SET GLOBAL gtid_purged-aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-2312;
SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167;
Answer: E
NEW QUESTION 25
Examine this command, which executes successfully:
mysqlpump -–user=root --password > full_backup.sql
Which two databases will be excluded from this dump? (Choose two.)
- A. world
- B. sys
- C. mysql
- D. information_schema
- E. employee
Answer: B,D
Explanation:
Explanation/Reference: https://mysqlserverteam.com/introducing-mysqlpump/
NEW QUESTION 26
Examine this query and output:
Which two statements are true? (Choose two.)
- A. The countrytable is accessed as the first table, and then joined to the city table.
- B. The query returns exactly 125 rows.
- C. The optimizer estimates that 51 rows in the countrytable have Continent = ‘Asia’.
- D. It takes more than 8 milliseconds to sort the rows.
- E. 35 rows from the city table are included in the result.
Answer: C,E
NEW QUESTION 27
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 metadata. Please use the most up to date instance: ‘host1:3377’. (RuntimeError) Which statement is true?
- A. The cluster is running and there is at least one ONLINEinstance.
- B. The active session instance is invalid and must be re-created by using the command shell.connect (‘host3:3377’).
- C. The instance deployed on host3must be rebuilt with a backup from the primary instance.
- D. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
- E. The instance deployed on host3must be synchronized from a donor deployed on host1by using the command cluster.addInstance(‘host1:3377’).
Answer: E
NEW QUESTION 28
Examine this MySQL client command to connect to a remote database:
mysql -h remote.example.org -u root -p --protocol=TCP --ssl-mode=
Which two --ssl-mode values will ensure that an X.509-compliant certificate will be used to establish the SSL/TLS connection to MySQL?
- A. PREFERRED
- B. VERIFY_CA
- C. VERIFY_IDENTITY
- D. REQUIRED
- E. DISABLED
Answer: D
NEW QUESTION 29
You have just installed MySQL on Oracle Linux and adjusted your /etc/my.cnfparameters to suit your installation.
Examine the output:
What statement is true about the start attempt?
- A. MySQL server was not started due to a problem while executing process 2732.
- B. systemdwaited for 30 seconds before timing out and start up failed.
- C. systemdattempted to start mysqld, found another systemd mysqldprocess running, and shut it down.
- D. MySQL server continued to start up even though another process existed.
- E. systemd found the mysqldservice disabled and failed to start it.
Answer: C
NEW QUESTION 30
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 moves all innodb tablespaces to the /innodb_extrasdirectory to enable a new innodb_data_home_dirto be defined.
- C. It defines all innodb tablespace options relative to a starting parent directory.
- D. It adds more temporary workspace in addition to the innodb_tmpdirlocation.
- E. It allows scanning of other locations to discover more innodb tablespaces.
Answer: A
NEW QUESTION 31
Consider this shell output and executed commands:
[root@oel7 ~]# ps aux | grep mysqld
mysql 2076 3.5 24.6 1386852 372572 ? Ssl 12:01 0:01 /usr/sbin/mysqid
[root@oel7 ~]# kill -15 2076
Which statement is true about MySQL server shutdown?
- A. mysqld_safe prohibits commands that would harm the operation of the server. An error would be returned by the kill command.
- B. kill -15 carries out a normal shutdown process, such as mysqladmin shutdown.
- C. kill -15 should be avoided. Use other methods such as mysqladmin shutdown or systemctl stop mysqld.
- D. kill -15 and kill -9 are effectively the same forced shutdown that risk committed transactions not written to disk.
Answer: B
NEW QUESTION 32
You encountered an insufficient privilege error in the middle of a long transaction.
The database administrator is informed and immediately grants the required privilege:
GRANT UPDATE ON world.city TO 'user1';
How can you proceed with your transaction with the least interruption?
- A. Change the default database and re-execute the failed statement in your transaction.
- B. Roll back the transaction and start the transaction again in the same session.
- C. Close the connection, reconnect, and start the transaction again.
- D. Re-execute the failed statement in your transaction.
Answer: D
NEW QUESTION 33
You are using mysqlcheck for server maintenance.
Which two statements are true? (Choose two.)
- A. The mysqlcheck --optimize --all-databases command reclaims free space from table files.
- B. The mysqlcheck command can be renamed mysqlrepair so that it repairs tables by default.
- C. The mysqlcheck --analyze --all-databases command performs a series of checks to spot eventual table corruptions.
Section: (none)
Explanation - D. The mysqlcheck --repair --all-databases command can repair an InnoDB corrupted table.
- E. The mysqlcheck --check --all-databases command takes table write locks while performing a series of checks.
Answer: B,C
NEW QUESTION 34
Which two MySQL Shell commands are excluded from the InnoDB Cluster creation procedure? (Choose two.)
- A. cluster.forceQuorumUsingPartitionOf()
- B. dba.configureInstance()
- C. dba.createCluster()
- D. cluster.addInstance()
- E. dba.configureLocalInstance()
- F. dba.checkInstanceConfiguration()
- G. cluster.setPrimaryInstance()
Answer: A,G
Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-shell-8.0-relnotes-en/news-8-0-16.html
NEW QUESTION 35
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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.
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