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Introduction
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Oracle also develops and builds tools and technologies for database management systems for middle-tier applications, Human Capital Management systems (HCM), Customer Relationship Management systems (CRM), Enterprise Resource Planning systems (ERP), and Supply Chain Management systems (SCM). Oracle Database commonly known as Oracle Database Management System (DBMS) is a multi-model database management system. It is a widely used database to run tasks for Data warehousing and Online Transaction processing databases. Different service providers make Oracle Database accessible on cloud, premises, or a hybrid cloud installation.
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Oracle 1Z0-908: MySQL 8.0 Database Administration
NEW QUESTION 13
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. kill -15 and kill -9 are effectively the same forced shutdown that risk committed transactions not written to disk.
- B. kill -15 should be avoided. Use other methods such as mysqladmin shutdown or systemctl stop mysqld.
- C. mysqld_safe prohibits commands that would harm the operation of the server. An error would be returned by the kill command.
- D. kill -15 carries out a normal shutdown process, such as mysqladmin shutdown.
Answer: D
NEW QUESTION 14
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 15
t is a non-empty InnoDB table.
Examine these statements, which are executed in one session:
BEGIN;
SELECT * FROM t FOR UPDATE;
Which is true?
- A. If OPTIMIZE TABLE; is invoked, it will create a table lock on t and force a transaction rollback.
- B. If ANALYZE TABLE; is invoked from the same session, it hangs until the transaction is committed or rolled back.
- C. If OPTIMIZE LOCAL TABLE t; is invoked from another session, it executes normally and returns the status.
- D. mysqlcheck --analyze --all-databases will execute normally on all tables and return a report.
Answer: C
NEW QUESTION 16
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 17
Which two statements are true about InnoDB data-at-rest encryption? (Choose two.)
- A. It supports only non-blob datatypes.
- B. It decrypts data for use in memory.
- C. It enforces encryption from disk to memory and over network transmission.
- D. It supports all indexes transparently.
- E. It does not support the transportable tablespaces feature.
Answer: B,D
Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-8.0-en/faqs-tablespace-encryption.html
NEW QUESTION 18
Examine this query:
What information does this query provide?
- A. total memory used by thread number 10
- B. total memory used across all connections associated with the user on connection number 10
- C. total memory used by connection number 10
- D. total memory used across all connections associated with the user on thread number 10
- E. total memory used by the first 10 connections
- F. total memory used by the first 10 threads
Answer: C
NEW QUESTION 19
You reconfigure and start a slave that was not replicating for several days.
The configuration file and CHANGE MASTER command are correct. Examine the GTID information from both master and slave:
Which statement is true?
- A. Replication will work.
- B. Replication will fail because the master has already purged transactions with cccccccc-cccc-cccc- cccc-cccccccccccc GTIDs.
- C. Replication will fail because the slave has purged more aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa transactions than the master.
- D. Replication will fail because of inconsistent numbers in cccccccc-cccc-cccc-cccc-cccccccccccc GTIDs.
- E. Replication will fail because the master does not have the required transaction with bbbbbbbb-bbbb- bbbb-bbbb-bbbbbbbbbbbb GTIDs in its binary logs.
Answer: C
NEW QUESTION 20
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. systemdattempted to start mysqld, found another systemd mysqldprocess running, and shut it down.
- B. systemdwaited for 30 seconds before timing out and start up failed.
- C. MySQL server continued to start up even though another process existed.
- D. MySQL server was not started due to a problem while executing process 2732.
- E. systemd found the mysqldservice disabled and failed to start it.
Answer: A
NEW QUESTION 21
Examine this command, which executes successfull
mysqlbackup --defaults-file=/backups/server-my.cnf --backup-dir=/backups/full copy-back Which statement is true about the copy-back process?
- A. It restores files from the backup directory to their original MySQL server locations.
- B. The copy-back process makes inconsistent backups.
- C. The copy-back process is used to overwrite a new backup over an existing backup.
- D. It restores files from the data directory to their original MySQL server locations.
Answer: A,C
NEW QUESTION 22
Which two commands will display indexes on the parts table in the manufacturing schema? (Choose two.)
- A. SHOW INDEXES FROM manufacturing.parts;
- B. SELECT * FROM information_schema.statistics WHERE table_schema='manufacturing' AND TABLE_NAME='parts';
- C. SELECT * FROM information_schema.COLUMN_STATISTICS;
- D. EXPLAIN SELECT INDEXES FROM manufacturing.parts;
- E. DESCRIBE manufacturing.parts;
Answer: B,C
NEW QUESTION 23
Your MySQL installation is running low on space due to binary logs. You need to reduce your log space usage urgently.
Which two sets of actions when completed will accomplish this? (Choose two.)
- A. Use SET GLOBAL binlog_expire_logs_seconds=<value> and restart the server.
- B. Set binlog_expire_logs_seconds in my.cnf.
- C. Set binlog_expire_logs_seconds = 0 in my.cnf and restart the server.
- D. Use PURGE BINARY LOGS to <binlog_name>.
- E. Use SET GLOBAL binlog_expire_logs_seconds=<value> and run the FLUSH BINARY LOGS command.
- F. Use SET PERSIST binlog_expire_logs_seconds=<value>.
Answer: A,F
NEW QUESTION 24
Examine this command and output:
Which two statements are true? (Choose two.)
- A. The lock is at the table object level.
- B. The lock is a row-level lock.
- C. The lock is at the metadata object level.
- D. The lock is a shared lock.
- E. The lock is an intentional lock.
- F. The lock is an exclusive lock.
Answer: A,F
NEW QUESTION 25
You must run multiple instances of MySQL Server on a single host.
Which three methods are supported? (Choose three.)
- A. Use systemdwith different settings for each instance.
- B. Start mysqldor mysqld_safeusing different option files for each instance.
- C. Run MySQL Server docker containers.
- D. Use resource groups to lock different instances on separate CPUs.
- E. Use system tools to lock each instance to its own CPU.
- F. Run mysqldwith --datadirdefined for each instance.
Answer: A,B,F
Explanation:
Explanation/Reference:
NEW QUESTION 26
Which two statements are true about MySQL server multi-source replication? (Choose two.)
- A. It uses only time-based replication conflict resolution.
- B. It is not compatible with auto-positioning.
- C. It relies on relay_log_recovery for resilient operations.
- D. It does not attempt to detect or resolve replication conflicts.
- E. It must use GTID replication.
- F. It needs to be re-instanced after a crash to maintain consistency.
Answer: A,E
NEW QUESTION 27
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. BLACKHOLE
- B. MEMORY
- C. ARCHIVE
- D. InnopB
- E. NDB
- F. MyISAM
Answer: A,E,F
NEW QUESTION 28
Examine this list of MySQL data directory binary logs:
binlog.000001 binlog.000002
.....
binlog.000289
binlog.000300
binlog.000301
binlog.index
Now examine this command, which executes successfully:
mysqldump --delete-master-logs --all-databases > /backup/db_backup.sql
Which two are true? (Choose two.)
- A. All databases are backed up to the output file.
- B. All non-active binary logs are removed from the master.
- C. All details regarding deleted logs and master metadata are captured in the output file.
- D. All binary logs are deleted from the master.
- E. All databases, excluding master metadata, are backed up to the output file.
- F. All binary logs are backed up and then deleted.
Answer: D,E
NEW QUESTION 29
Which step or set of steps can be used to rotate the error log?
- A. Execute SET GLOBAL log_error = '<new error log file>'.
- B. Execute SET GLOBAL expire_logs_days=0 to enforce a log rotation.
- C. Execute SET GLOBAL max_error_count = <number of messages at point to rotate>.
- D. Rename the error log file on disk, and then execute FLUSH ERROR LOGS.
Answer: D
NEW QUESTION 30
There are five MySQL instances configured with a working group replication.
Examine the output of the group members:
Which two statements are true about network partitioning in the cluster? (Choose two.)
- A. The cluster has built-in high availability and updates group_replication_ip_whitelistto remove the unreachable nodes.
- B. The group replication will buffer the transactions on the online nodes until the unreachable nodes return online.
- C. The cluster will shut down to preserve data consistency.
- D. There could be both a 2 node and 3 node group replication still running, so shutting down group replication and diagnosing the issue is recommended.
- E. A manual intervention to force group members to be only the working two instances is required.
Answer: A,C
NEW QUESTION 31
Examine this SQL statement:
mysql> GRANT r_read@localhost TO mark WITH ADMIN OPTION;
Which two are true? (Choose two.)
- A. Mark can grant the r_read@localhost role to another user.
- B. Mark can revoke the r_read@localhost role from another role.
- C. Mark must connect from localhost to activate the r_read@localhost role.
- D. Mark can grant the privileges assigned to the r_read@localhost role to another user.
- E. ADMIN OPTION allows Mark to drop the role.
- F. ADMIN OPTION causes the role to be activated by default.
Answer: D,E
NEW QUESTION 32
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 (Population);
- B. ALTER TABLE world.city ADD INDEX (Name);
- C. ALTER TABLE world.city ADD FULLTEXT INDEX (Name);
- D. ALTER TABLE world.city ADD SPATIAL INDEX (Population);
- E. ALTER TABLE world.city ADD SPATIAL INDEX (Name);
- F. ALTER TABLE world.city ADD INDEX (Population);
Answer: D
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-indexes.html
NEW QUESTION 33
Which two are characteristics of snapshot-based backups? (Choose two.)
- A. A separate physical copy must be made before releasing the snapshot backup.
- B. Snapshot-based backups greatly reduce time during which the database and applications are unavailable.
- C. Snapshot backups can be used only in virtual machines.
- D. There is no need for InnoDB tables to perform its own recovery when restoring from the snapshot backup.
- E. The frozen file system can be cloned to another virtual machine immediately into active service.
Answer: A,C
NEW QUESTION 34
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 35
Which two are true about binary logs used in asynchronous replication? (Choose two.)
- A. They contain events that describe only administrative commands run on the master.
- B. They are pulled from the master to the slave.
- C. They contain events that describe database changes on the master.
- D. They contain events that describe all queries run on the master.
- E. They are pushed from the master to the slave.
Answer: C,E
Explanation:
Explanation/Reference: https://www.oracle.com/technetwork/community/developer-day/mysql-replication-presentation-
485890.pdf (14)
NEW QUESTION 36
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 37
Which two queries are examples of successful SQL injection attacks? (Choose two.)
- A. SELECT email,passwd FROM members
WHERE email = 'INSERT INTO members('email','passwd') VALUES ('[email protected]',
'secret');--'; - B. SELECT id, name FROM user WHERE id=23 OR id=32 OR 1=1;
- C. SELECT user,passwd FROM members
WHERE user = '?';INSERT INTO members('user','passwd') VALUES
('[email protected]','secret');--'; - D. SELECT id, name FROM user WHERE id=23 OR id=32 AND 1=1;
- E. SELECT id, name FROM user WHERE user.id=(SELECT members.id FROM members);
- F. SELECT user, phone FROM customers WHERE name = '\; DROP TABLE users; --';
Answer: A,D
NEW QUESTION 38
......
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