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How to Prepare for Oracle 1Z0-908: MySQL 8.0 Database Exam
Preparation Guide for Oracle 1Z0-908: MySQL 8.0 Database Administrator Exam
Introduction
Oracle, based in California, is an American multinational Information Technology company. Oracle is an international company that develops software applications for business. To help enterprises develop their operations, Oracle provides a variety of cloud-based applications and systems as well as hardware and services. Data management, business analytics, IT operations management, enterprise resource planning, security, and emerging technologies are the focus of Oracle’s applications. Oracle is best known for its database software and technology. Oracle Database, a relational Database Management System (DBMS), is one of the most popular corporate database products.
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.
This exam guide gives a brief introduction to the topics of 1Z0-908 practice exams and 1Z0-908 dumps.
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.
NEW QUESTION 13
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. A manual intervention to force group members to be only the working two instances is required.
- 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. The cluster has built-in high availability and updates group_replication_ip_whitelistto remove the unreachable nodes.
- E. 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.
Answer: C,D
NEW QUESTION 14
Examine these commands and output:
Which connection ID is holding the metadata lock?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
- F. 5
Answer: B
NEW QUESTION 15
You have a MySQL system with 500 GB of data that needs frequent backups.
You use a mix of MyISAM and InnoDB storage engines for your data.
Examine your backup requirement:
* The MySQL system being backed up can never be unavailable or locked to the client applications.
* The recovery from the backup must work on any system.
* Only 1 hour of data can be lost on recovery of the backup.
Which option fulfills all backup requirements?
- A. Use the Clone Plugin to copy the data to another MySQL system.
- B. Take your backup from a slave of the MySQL system.
- C. Take a physical backup of the MySQL system.
- D. Take a logical backup of the MySQL system.
Answer: D
NEW QUESTION 16
A valid raw backup of the shop.customers MyISAM table was taken.
You must restore the table. You begin with these steps:
1. Confirm that secure_file_priv='/var/tmp'
2. mysql> DROP TABLE shop.customers;
3. shell> cp /backup/customers.MY* /var/lib/mysql/shop/
Which two actions are required to complete the restore? (Choose two.)
- A. shell> cp /backup/customers.sdi /var/tmp
- B. mysql> SOURCE '/var/tmp/customers.sdi'
- C. shell> cp /backup/customers.sdi /var/lib/mysql/shop/
- D. mysql> IMPORT TABLE FROM /var/tmp/customers.sdi
- E. mysql> IMPORT TABLE FROM /var/lib/mysql/shop/customers.sdi
- F. mysql> ALTER TABLE shop.customers IMPORT TABLESPACE
- G. mysql> ALTER TABLE shop.customers DISCARD TABLESPACE
- H. shell> cp /backup/customers.frm /var/lib/mysql/shop/
Answer: D,F
NEW QUESTION 17
Your MySQL server is running on the Microsoft Windows platform.
Which three local connection protocols are available to you? (Choose three.)
- A. X Protocol
- B. SOCKET
- C. TCP/IP
- D. UDP
- E. named pipes
- F. shared memory
Answer: C,E,F
NEW QUESTION 18
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 19
Examine this command and output:
Which two statements are true? (Choose two.)
- A. The lock is a shared lock.
- B. The lock is at the metadata object level.
- C. The lock is a row-level lock.
- D. The lock is at the table object level.
- E. The lock is an exclusive lock.
- F. The lock is an intentional lock.
Answer: D,E
NEW QUESTION 20
Examine this command, which executes successfully:
shell> mysqldump --master-data=2 --single-transaction --result-file=dump.sql mydb Which two statements are true? (Choose two.)
- A. It enforces consistent backups for all storage engines.
- B. The backup created is a consistent data dump.
- C. It executes flush tables with read lock.
- D. It is a cold backup.
- E. This option uses the READ COMMITTED transaction isolation mode.
Answer: C,E
NEW QUESTION 21
You plan to install MySQL Server by using the RPM download.
Which two statements are true? (Choose two.)
- A. You can provide the root password interactively.
- B. You must manually initialize the data directory.
- C. The functionality is split among several RPM package files.
- D. The MySQL RPM package installation supports deploying multiple MySQL versions on the same host.
- E. MySQL uses the RPM relocatable installation target feature.
- F. You can find the root password in the error log after the first start.
Answer: D,F
NEW QUESTION 22
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 23
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 details regarding deleted logs and master metadata are captured in the output file.
- C. All binary logs are backed up and then deleted.
- D. All databases, excluding master metadata, are backed up to the output file.
- E. All binary logs are deleted from the master.
- F. All non-active binary logs are removed from the master.
Answer: D,E
NEW QUESTION 24
Which statement is true about InnoDB persistent index statistics?
- A. Tables are scanned and index statistics recalculated when an instance is restarted.
- B. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.
- C. Increasing innodb_stats_persistent_sample_pages determines higher pages scanning speed, at the cost of increased memory usage.
- D. Updating index statistics is an I/O expensive operation.
- E. Index statistics are calculated from pages buffered in the buffer pool for tables with InnoDB storage engine.
- F. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
Answer: B
NEW QUESTION 25
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
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 26
Which three are characteristics of a newly created role? (Choose three.)
- A. It can be renamed using the RENAME ROLEstatement.
- B. It is stored in the mysql.roletable.
- C. It can be protected with a password.
- D. It can be granted to user accounts.
- E. It is created as a locked account.
- F. It can be dropped using the DROP ROLEstatement.
Answer: C,D,F
Explanation:
Explanation/Reference:
NEW QUESTION 27
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 28
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. ib_logfile* files
- B. *.sdi files
- C. ibbackup files
- D. *.CSM files
- E. *.ibd files
Answer: A,E
NEW QUESTION 29
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. NDB
- D. InnopB
- E. ARCHIVE
- F. MyISAM
Answer: A,C,F
NEW QUESTION 30
You must run multiple instances of MySQL Server on a single host.
Which three methods are supported? (Choose three.)
- A. Use resource groups to lock different instances on separate CPUs.
- B. Use systemd with different settings for each instance.
- C. Start mysqld or mysqld_safe using different option files for each instance.
- D. Run MySQL Server docker containers.
- E. Run mysqld with --datadir defined for each instance.
- F. Use system tools to lock each instance to its own CPU.
Answer: B,C,E
NEW QUESTION 31
You wish to protect your MySQL database against SQL injection attacks.
Which method would fail to do this?
- A. installing and configuring the Connection Control plugin
- B. using PREPARED STATEMENTS
- C. avoiding concatenation of SQL statements and user-supplied values in an application
- D. using stored procedures for any database access
Answer: D
NEW QUESTION 32
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