Download MySQL 5.6 Developer.1z0-882.PracticeTest.2018-08-16.54q.vcex

Vendor: Oracle
Exam Code: 1z0-882
Exam Name: MySQL 5.6 Developer
Date: Aug 16, 2018
File Size: 2 MB
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Demo Questions

Question 1
Which three are valid identifiers for the user table in the mysq1 database?
  1. myssq1. user
  2. ‘mysq1. user’
  3. ‘mysq1’. ‘user’
  4. Mysq1. ‘user’
  5. ‘’mysq1. User’’
Correct answer: ACD
Question 2
You have a transaction that queries a table at the beginning of the transaction and performs the same query later. 
Which two transaction isolation levels guarantee that you get the same results both times?
  1. Repeatable read
  2. Read committed
  3. Read uncommitted
  4. Single user
  5. serializable
Correct answer: AE
Explanation:
Reference: http://dev.mysql.com/doc/refman/5.0/en/commit.html
Reference: http://dev.mysql.com/doc/refman/5.0/en/commit.html
Question 3
Which three database objects have non-case-sensitive names on all operating system?
  1. Table
  2. Column
  3. Index
  4. Stored procedure
  5. Trigger
Correct answer: ABC
Question 4
Cormcctor/Net supports a decoupled database connection mode, where a database Connection is established only when needed.                                 '             
Choose the three parts that are involved when working with decoupled data.
  1. OpenConnect.MySql, DataTTiread.MySql, CommandExecutor.MySql
  2. MySqlQueryBuIld, MySqlQuerytxer. MySq I Query Results
  3. DecoupODBCConn, DecoupMyScjlruiiimanrt, DecoupMySqlRetum
  4. DataSet, MySqlDataAdapter, MySql Command Builder
Correct answer: D
Explanation:
Reference: http://dev.mysql.com/doc/connector-net/en/connector-net-tutorials-data-adapter.html
Reference: http://dev.mysql.com/doc/connector-net/en/connector-net-tutorials-data-adapter.html
Question 5
You have two test tables:
  • Code_innodb as InnoDB engine 
  • Code_ myisam as MYISAM engine 
The tables have the same structure:
  
The tables have one row of data:
  
You execute an INSERT statement on both code_myisam tables and receive duplicate key errors:
mysql> INSERT  INTO code_innodb VALUES (1, ‘Alpha’), (2, ‘Beta’), (3, ‘charlie,),(4, ‘Delta’); 
ERROR 1062 (23000): Duplicate entry ‘3’ for key ‘PRIMARY’
Mysql> INSERT INTO code_myisam VALUES (1, ‘Alpha’), (2, ‘Beta’), (3, ‘charlie’), 
(4, ‘Delta’); 
ERROR 1062 (23000); Duplicate entry ‘3’ for key ‘PRIMARY’ 
What is the expected output of the SELECT statements? 
  
  1. Option A
  2. Option B
  3. Option C
  4. Option D
Correct answer: A
Question 6
Which two code samples demonstrate valid methods for working with loops?
  1. DECLARE I  INT DEFAULT 0; 
    Test_loop: LOOP
    SET i  =i  +1; 
    IF i> =5 THEN 
    LEAVE test_loop; 
    END  IF; 
    END LOOP test_loop;
  2. DECLARE i INT DEFAULT 0; 
    WHILE I < 5ITERATE 
    SET i = i  +1; 
    END WHILE;
  3. DECLARE i  INT DEFAULT 0; 
    WHILE i < 5 Do 
    SET  i = i + 1; 
    END WHILE;
  4. DECLARE i  INT DEFAULT 0; 
    Test _loop; LOOP 
    SET i =i +1; 
    IF i >=5 THEN LEAVE; 
    END IF; 
    END LOOP test_loop;
Correct answer: CD
Question 7
A table (t1) contains 1000 random integer values in the first column (col1).The random values are in the range of 0-1000. 
Examine this query:
SELECT col1 FROM t1 WHERE col1 <=100 UNION 
SELECT col1 FROM t1 WHERE col1 >=900 ORDER BY col1 DESC 
What is the expected output?
  1. A list of all values, including duplicates, sorted in descending order in the ranges of 0-100 and 900-1000
  2. A list of all random unsorted values, including duplicates, in the range of 0-100 followed by the list of all values, including in the range of 900-1000 sorted in descending order
  3. A list of unique random values in the range of 0-100 followed by the list of unique values in the range of 900-1000 sorted in descending order
  4. A list of all unique values sorted in descending order within the ranges of 0-100 and 900-1000
Correct answer: B
Question 8
A SELECT statement without an ORDER BY clause return some rows. 
Which statement is always true about the order of the returned results?
  1. The results are in ascending order.
  2. The results are in descending order.
  3. The results are in the order inserted.
  4. The results are not in a set order.
Correct answer: C
Explanation:
Reference: http://www.postgresql.org/docs/8.2/static/sql-select.html#SQL-ORDERBY
Reference: http://www.postgresql.org/docs/8.2/static/sql-select.html#SQL-ORDERBY
Question 9
A complex query consists of eight populated tables that are all connected via INNER JOIN operands as shown: 
  
You modify the query and replace the SELECT operand with SELECT  STRAIGHT JOIN. 
What is the effect of adding STRAIGHT JOINs to the query?
  1. The optimizer processes only the JOINs in the sequence listed in the query.
  2. The optimizer will only JOIN the tables by using their PRIMARY KEYS or UNIQUE constraints.
  3. The optimizer will only JOIN the tables in sequence from smallest to largest.
  4. The optimizer ignores all terms in the WHERE clause until all JOINs have been completed.
Correct answer: A
Question 10
Which two can be used to obtain information stored in the Diagnostics Area?
  1. SHOW WARNINGS
  2. GET  DIAGNOSTICS CONDITION 1 @errno=MYSQL_ERRNO, @msg =MESSAGE_TEXT; 
    SELECT @errno, @msg;
  3. SELECT ERRNO, MESSAGE_TEXT FROM INFORMATION_SCHEMA.DIAGNOSTICS_AREA WHERE CONDITION=1
  4. SHOW GLOBAL STATUS LIKE ‘Diagnostics’
Correct answer: AB
Explanation:
Reference: http://dev.mysql.com/doc/refman/5.6/en/diagnostics-area.html
Reference: http://dev.mysql.com/doc/refman/5.6/en/diagnostics-area.html
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