Oracle 1Z0-909 Exam Questions (Updated 2023) 100% Real Question Answers
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Whether you’re a novice or an experienced MySQL developer, taking the Oracle 1z1-909 certification exam is an excellent way to demonstrate your skills to potential employers, enhance your resume, and differentiate yourself from other candidates in the job market. As a globally recognized certification from Oracle, the 1z1-909 exam is an investment in your career that can pay off for years to come.
The Oracle 1Z0-909 (MySQL 8.0 Database Developer) Exam is a certification exam that is designed to test the knowledge and skills of professionals who work with the MySQL 8.0 database. This exam is intended for database developers who work with MySQL 8.0 and want to demonstrate their expertise in the field. The exam covers a wide range of topics, including database design, SQL programming, and database administration.
NEW QUESTION # 31
Examine these commands and output:
Which is true?
- A. Existing emp_vuL is dropped and a new emp_vu1 created with the new definition.
- B. It returns an error because the DROP TABLE statement did not drop the view.
- C. A new view is created because the previous was dropped on execution of the drop table statement.
- D. It returns an error because the CREATE TABLE statement automatically recreated the view.
Answer: A
NEW QUESTION # 32
Examine these commands and output:
Which is true about the execution of the insert statement?
- A. It returns an error.
- B. It inserts a new row in the base table only.
- C. It inserts a new row in the view only.
- D. It inserts a row in the view and base table.
Answer: C
NEW QUESTION # 33
Examine this bar graph based on columns from the players table:
Which two statements would generate this bar graph?
- A. SELECT Name, Gender, Sport, CHAR_LENGTH ('# ' GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- B. SELECT Name, Gender, Sport, LENGTH (GPA*10, '# ') AS GPA_Graph FROM players ORDER BY GPA DESC;
- C. SELECT Name, Gender, Sport, REPEAT('# 'Y GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- D. SELECT Name, Gender, Sport, RPAD ('# ' GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- E. SELECT Name, Gender, Sport, CONCAT ('# ' GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
Answer: C,D
NEW QUESTION # 34
Examine these lines of Python code:
You must add a line of code to complete the code to return data to the variable d. Which line will do this?
- A. d = cursor . f etchall (query)
- B. d = cursor.fetchall(query, (hire_start, hire_end))
- C. d = cursor.fetch(query % (hire_start, hire_end))
- D. d = cursor.execute(query, (hire_start, hire_end) )
- E. d = cursor.execute(query)
- F. d = cursor.fetch(query, (hire_start, hire_end))
Answer: F
NEW QUESTION # 35
How does InnoDB choose deadlock victims in MySQL?
- A. It chooses the transaction with the most modified rows.
- B. It chooses the transaction with the least accumulated CPU time.
- C. It chooses the transaction with the fewest modified rows.
- D. It chooses the transaction randomly.
- E. It chooses the transaction with the most accumulated CPU time.
- F. It chooses the transaction with the lowest transaction ID.
Answer: D
NEW QUESTION # 36
Examine this statement that execute successfully in an interactive session:
The user running this session now goes to lunch for an hour.
Now, examine these statements executed independently in separate sessions while Session 0 is still active:
How many of them will complete while Session 0 is still active?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
- F. 5
Answer: C
NEW QUESTION # 37
Examine the Test.php script which is numbered for clarity, and its output:
PHP Fatal error: Uncaught Error: call to underined function mysqli_connect () in Test.php:2 Which action will fix this error?
- A. Install the PHP executable in the path used by the MySQL installation.
- B. Enable the mysqli extension in the php.ini file.
- C. Replace line 2 With: Slink = mysql_xdevapi\getSession
("mysqlx://username:password@localhost:3306","schema"); - D. Replace line 2 with Slink = mysql.connect {"localhost: 3306n, "username", "pas "schema") ;
Answer: C
NEW QUESTION # 38
Examine these statement which execute successfully:
Now, examine the statements executed in the mysqi command-line client:
What is true?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 39
Examine the statement which executes successfully:
SET sql_mode=' NO_ENGINE_SUBSTITTJTION' ;
You try to create a table with a storage engine that is not available. What will happen?
- A. The server will create the table but it will be unusable until the specified storage engine is available.
- B. An error occurs and the create table statement fails.
- C. The server will create the table but report an error when the first attempt to insert a row is performed.
- D. The server will create the table using the default storage engine.
Answer: B
NEW QUESTION # 40
Which two differences exist between the timestamp and date time data types?
- A. timestamp has larger range of values.
- B. timestamp stores the interval between two dates.
- C. timestamp uses less storage space.
- D. timestamp converts the value based on the session time zone.
- E. timestamp stores more decimal points in seconds
Answer: C,D
NEW QUESTION # 41
Which select statement returns true?
- A. SELECT NULL <=> NULL;
- B. SELECT NULL := NULL;
- C. SELECT NULL = NULL;
- D. SELECT NULL <> NULL;
Answer: A
NEW QUESTION # 42
Examine these statements:
SET collation_connection=utf8mb4_0900_as_cs;
SELECT STRCMPCAlice', UCASE ('Alice* )) ;
What is displayed?
- A. ERROR: 1267 (HYOOO): Illegal mix of collations
- B. NULL
- C. 0
- D. 1
- E. 2
Answer: C
NEW QUESTION # 43
Which two statements are true about aggregate functions?
- A. AVG () does not allow use of the distinct option.
- B. MIN () cannot use distinct when it executes as a Windows function.
- C. COUNT (distinct) returns a count of the number of rows with different values including Null.
- D. SUM () returns o if there are no rows to aggregate.
- E. MAX () returns null if there are no rows to aggregate.
Answer: A
NEW QUESTION # 44
What is an advantage of using mysqli in PHP programs rather than using PHP Data Objects (PDO)?
- A. mysqli includes X DevAPI functions.
- B. mysqli can access databases from other vendors.
- C. mysqli supports non blocking, asynchronous queries.
- D. mysqli supports object oriented programming.
Answer: D
NEW QUESTION # 45
Examine this statement and output:
CREATE TABLE geom (g GEOMETRY NOT NOLL, SPATIAL INDEX(g) ) ; Query OK, 0 rows affected, 1 warning (0.01 sec) An attempt is made to add an SRID attribute to the column using the statement:
ALTER TABLE geom MODIFY COLUMN g geometry NOT NULL SRID 0;
Which is true?
- A. An error is generated because the index prevents changes to the column.
- B. Execution succeeds with a warning.
- C. An error is generated because srid o is an invalid identifier value.
- D. Execution succeeds and allows the use of the index by the optimizer.
Answer: A
NEW QUESTION # 46
You must write a statement that combines the first_name and last_name columns from the employees table as "last_name, first_name." Which two statements will do this?
- A. SELECT last_name + ', ' + first_name FROM employees;
- B. SELECT last_name, ' , ',first_name FROM employees;
- C. SELECT GROUP_CONCAT(last_name, first_name) FROM employees;
- D. SELECT CONCAT_WS(', ',last_name,first_name) FROM employees;
- E. SELECT CONCAT(last name,', ',first_name) FROM employees;
Answer: D,E
NEW QUESTION # 47
Which two statements are true about AUTO_INCREMENT?
- A. An AUTO_INCREMENT column must be indexed.
- B. A table can have multiple AUTO_INCREMENT columns.
- C. AUTO_INCREMENT values allocated to a transaction that is rolled back are not reused.
- D. The decimal data type supports AUTO_INCREMENT.
- E. A server restart always resets the AUTO_INCREMENT value to largest value in the AUTO_INCREMENT column plus 1.
Answer: D,E
NEW QUESTION # 48
The collection col contains all episodes for all seasons for a TV show.
Examine this document which has an example of the details for each episode:
Which query returns all expisode names from the first season?
- A. SELECT "S.name" FROM col WHERE "S.season" = "1";
- B. SELECT name FROM col WHERE season = 1;
- C. SELECT doc->"$.name" FROM col WHERE doc->"$.season" = "1";
- D. SELECT doc->,$.name,, FROM col WHERE doc->"$ . season" = "1";
Answer: A
NEW QUESTION # 49
Examine these commands which execute successfully in the sequence shown in Sessions S1 and S2:
Now, examine this statement that execute successfully in s1:
S1> SELECT * FROM emp;
Which is true about the result of the select statement?
- A. The inserted row is not returned because the transaction still active in s2.
- B. The inserted row is returned because the transaction is auto committed in S2.
- C. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
- D. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
Answer: A
NEW QUESTION # 50
Examine this statement and output:
You execute this statement:
SELECT JSON_SEARCH(product,'one','IT') FROM fshop ;
What is the output?
- A. ''$.varieties[4]. origin[1]''
- B. ''$.varieties [3]. origin[0]''
- C. product->''$.varieties [4]. origin[1];;
- D. product->varieties[3]. origin[0]''
Answer: C
NEW QUESTION # 51
The meeting table stores meeting schedules with participants from five continents. The participants' details are stored in another table.
You need to adjust the start_time and duration columns for optimal storage. What datatype changes would achieve this?
- A. start_time TIMESTAMP duration TIMESTAMP
- B. start_time TIME duration TIME
- C. start_time DATETIME duration DATETIME
- D. start__time DATETIME duration TIME
- E. start_time TIMESTAMP duration TIME
Answer: C
NEW QUESTION # 52
The employee table includes these columns:
e_id INT, e_name VARCHAR (45), dept_id INT salart INT
You must create a stored function, getMaxSalary(), which returns the maximum salary paid for a given department id.
Which statement will create the function?
- A.
- B.
- C.
- D.
Answer: B
NEW QUESTION # 53
Which two are true about indexes?
- A. Indexes reduce disk space used.
- B. Indexes contain rows sorted by key values.
- C. Indexing all of a table's columns improves performance.
- D. Secondary index access will always be faster than a table scan.
- E. Indexes are used to enforce unique constraints.
Answer: A,C
NEW QUESTION # 54
Examine this statement and output:
Which will provide the same level of detail when the error is encountered within a stored routine?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 55
Examine this SQL statement:
- A. db. country-select(['Name','Population']) .where('Name LIKE :param') -bind ('param' , 'United*') -limit(5)
- B. db . country, select ( [ ' Name LIKE "united%" ' , ' Population>^0 ' ] ) - limit (5)
- C. db . country. Select ([Name' , 'Population.'] ) -limit (5) .where('Name LIKE "United%"')
- D. db . country. fields ( [ ' Name ' , 'Population']) . select (' limit=5 ' ) .where('Name LIKE "United%" ' )
- E. db.country. fields ( [ 'Name ' , 'Population* ] ) .where ( 'Name LIKE "United%',,) -select ()-limit(5)
Answer: A
NEW QUESTION # 56
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