Download MySQL 5.6 Database Administrator.1z0-883.PracticeTest.2018-08-09.58q.vcex

Vendor: Oracle
Exam Code: 1z0-883
Exam Name: MySQL 5.6 Database Administrator
Date: Aug 09, 2018
File Size: 364 KB
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Demo Questions

Question 1
You execute the following statement in a Microsoft Windows environment. There are no conflicts in the path name definitions. 
C: \> mysqld – install Mysql56 – defaults – file = C : \my –opts.cnf
What is the expected outcome?
  1. Mysqld acts as an MSI installer and installs the Mysql 5.6 version, with the c: \my-opts.cnf configuration file.
  2. Mysql is installed as the Windows service name Mysql56, and uses c: \my-opts.cnf as the configuration file
  3. An error message is issued because – install is not a valid option for mysqld.
  4. A running Mysql 5.6 installation has its runtime configuration updated with the server variables set in c: \my-opts.cnf.
Correct answer: B
Question 2
Consider the events_% tables in performance Schema. 
Which two methods will clear or reset the collected events in the tables?
  1. Using DELETE statements, for example, DELETE FROM performance_schema.events_watis_current;
  2. Using the statement RESET PERFORMANCE CACHE;
  3. Using the statement FLUSH PERFORMANCE CACHE;
  4. Using TRUNCATE statements, for example, TRUNCATE TABLE performance_schema.events_waits_current;
  5. Disabling and re-enabling all instruments
  6. Restarting Mysql
Correct answer: DE
Explanation:
D: To avoid unpredictable results if you make timer changes, use TRUNCATE TABLE to reset Performance Schema statistics.Example:As with other aggregate tables within Performance Schema, you can reset the statistics within the digest table with:TRUNCATE TABLE performance_schema.events_statements_summary_by_digest; Reference: 22.2.3.1 Performance Schema Event Timinghttp://dev.mysql.com/doc/refman/5.5/en/performance-schema-timing.html
D: To avoid unpredictable results if you make timer changes, use TRUNCATE TABLE to reset Performance Schema statistics.
Example:
As with other aggregate tables within Performance Schema, you can reset the statistics within the digest table with:
TRUNCATE TABLE performance_schema.events_statements_summary_by_digest; 
Reference: 22.2.3.1 Performance Schema Event Timing
http://dev.mysql.com/doc/refman/5.5/en/performance-schema-timing.html
Question 3
What are four capabilities of the mysql client program?
  1. Creating and dropping databases
  2. Creating, dropping, and modifying tables and indexes
  3. Shutting down the server by using the SHUTDOWN command
  4. Creating and administering users
  5. Displaying replication status information
  6. Initiating a binary backup of the database by using the START BACKUP command
Correct answer: ABCDE
Question 4
Assume that you want to know which Mysql Server options were set to custom values. 
Which two methods would you use to find out?
  1. Check the configuration files in the order in which they are read by the Mysql Server and compare them with default values.
  2. Check the command-line options provided for the Mysql Server and compare them with default values.
  3. Check the output of SHOW GLOBAL VARIABLES and compare it with default values.
  4. Query the INFORMATION_SCHEMA.GLOBAL_VARIABLES table and compare the result with default values.
Correct answer: CD
Question 5
You install a copy of Mysql 5.6.13 on a brand new Linux server by using RPM packages. The server starts successfully as verified by the following commands:
$ pidof mysqld
3132
$tail - n2 /var/lib.mysql/hostname.err
2013-08-18 08:18:38 3132 [Note] /usr/sbin/mysqld: ready for connections.
Version: ‘5.6.13-enterprise-commercial-advaced’ socket: ‘/tmp/mysql.sock’ port;
3306 Mysql Enterprise Server – Advanced Edition (Commercial)
You attempt to log in as the root user with the following command:
$mysql –u root
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: NO)
Which statement is true about this scenario?
  1. The RPM installation script sets a default password of password for new installations.
  2. The local root user must log in with a blank password initially: mysql –u root –p.
  3. New security measures mean that the mysql_secure_installation script must be run first on all new installations.
  4. The mysql_install_bd post-installation script used – random-password.
Correct answer: B
Question 6
A Mysql Server has been running an existing application successfully for six months. 
The my.cnf is adjusted to contain the following additional configuration:
[mysqld] 
Default-authentication-plugin=sha256_password 
The Mysql Server is restarted without error. 
What effect will the new configuration have in existing accounts?
  1. They will have their passwords updated on start-up to sha256_password format.
  2. They will have to change their password the next time they login to the server.
  3. They are not affected by this configuration change.
  4. They all connect via the secure sha256_password algorithm without any configuration change.
Correct answer: D
Explanation:
Reference: http://dev.mysql.com/doc/refman/5.6/en/sha256-authentication-plugin.html
Reference: http://dev.mysql.com/doc/refman/5.6/en/sha256-authentication-plugin.html
Question 7
In a design situation, there are multiple character sets that can properly encode your data. 
Which three should influence your choice of character set?
  1. Disk usage when storing data
  2. Syntax when writing queries involving JOINS
  3. Comparing the encoded data with similar columns on other tables
  4. Memory usage when working with the data
  5. Character set mapping index hash size
Correct answer: CDE
Question 8
What are three actions performed by the mysql_secure_installation tool?
  1. It prompts you to set the root user account password.
  2. It checks whether file permissions are appropriate within datadir.
  3. It asks to remove the test database, which is generated at installation time.
  4. It can delete any anonymous accounts.
  5. It verifies that all users are configuration with the longer password hash.
Correct answer: ACD
Explanation:
Reference: http://prefetch.net/blog/index.php/2006/06/18/securing-mysql-installations-with-mysql_secure_installation/
Reference: http://prefetch.net/blog/index.php/2006/06/18/securing-mysql-installations-with-mysql_secure_installation/
Question 9
Consider the query:
Mysql> SET @run = 15; 
Mysql> EXPLAIN SELECT objective, stage, COUNT (stage) 
→FROM iteminformation 
→WHERE run=@run AND objective=’7.1’ 
→GROUP BY objective,stage 
→ORDER BY stage; 
  
The iteminformation table has the following indexes; 
Mysql> SHOW INDEXES FROM iteminformation:
 
 
This query is run several times in an application with different values in the WHERE clause in a growing data set. 
What is the primary improvement that can be made for this scenario?
  1. Execute the run_2 index because it has caused a conflict in the choice of key for this query.
  2. Drop the run_2 index because it has caused a conflict in the choice of key for this query.
  3. Do not pass a user variable in the WHERE clause because it limits the ability of the optimizer to use indexes.
  4. Add an index on the objective column so that is can be used in both the WHERE and GROUP BY operations.
  5. Add a composite index on (run,objective,stage) to allow the query to fully utilize an index.
Correct answer: B
Question 10
Consider typical High Availability (HA) solutions that do not use shared storage. 
Which three HA solutions do not use shared storage?
  1. Mysql Replication
  2. Distributed Replicated Block Device (DRBD) and Mysql
  3. Windows Cluster and Mysql
  4. Solaris Cluster and Mysql
  5. Mysql NDB Cluster
Correct answer: ABE
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