[Jun-2023] Free 1Z0-909 Exam Questions 1Z0-909 Actual Free Exam Questions [Q20-Q42]

[Jun-2023] Free 1Z0-909 Exam Questions 1Z0-909 Actual Free Exam Questions

Verified 1Z0-909 dumps and 66 unique questions

The Oracle 1Z0-909 (MySQL 8.0 Database Developer) Certification Exam is an industry-recognized exam designed to validate the skills and knowledge of database developers who work with MySQL 8.0. This certification is ideal for those who want to demonstrate their expertise in using MySQL 8.0 to design, develop, and maintain database applications.

NEW QUESTION # 20
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: B

NEW QUESTION # 21
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 srid o is an invalid identifier value.
B. Execution succeeds with a warning.
C. An error is generated because the index prevents changes to the column.
D. Execution succeeds and allows the use of the index by the optimizer.

Answer: C

NEW QUESTION # 22
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 doc->,$.name,, FROM col WHERE doc->"$ . season" = "1";
C. SELECT name FROM col WHERE season = 1;
D. SELECT doc->"$.name" FROM col WHERE doc->"$.season" = "1";

Answer: A

NEW QUESTION # 23
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: B

NEW QUESTION # 24
Your program which uses a MySQL connector receives this error:
Client does not support authentication protocol request by server
The account running the program uses caching_sha2_password.
Which two resolve this conflict?

A. Disable TLS/SSL authentication.
B. Use blank RSA or SSL certificates.
C. Upgrade the connector to a version that supports caching_sha2_password.
D. Place this in the root directory of your shell account:
[mysqld] require__secure_transport=OFF
E. Change the user account to use mysql_native_password.

Answer: C

NEW QUESTION # 25
Examine these statements issued from Session 1 which execute successfully:

Now, examine these statements issued from Session 2 which execute successfully:
Session 2>
BEGIN;
UPDATE band SET song=CONCAT ("Here Comes the ", song) WHERE song LIKE ' %Sun ; Which two are true?

A. Session 2 takes an exclusive lock on all the rows in the band table.
B. Session 2 does not start a transaction.
C. Statements in Session 2 are committed.
D. Session 1 takes a shared lock on all the rows in the band table.
E. Session 1 must commit before the update in Session 2 can complete.
F. Session 1 does not block Session 2.

Answer: C,E

NEW QUESTION # 26
Which two differences exist between the timestamp and date time data types?

A. timestamp uses less storage space.
B. timestamp stores the interval between two dates.
C. timestamp converts the value based on the session time zone.
D. timestamp has larger range of values.
E. timestamp stores more decimal points in seconds

Answer: B,E

NEW QUESTION # 27
Your session has sqi_mode set to default.
Examine this statement which executes successfully:

Now examine this statement:

Which two changes are required to the insert statement so that it inserts the correct data?
* std_id = 10301
* firstname = Mary
* lastname = O'Hagen
* birthdate = November 26, 1997
* reg_date = the current date

A. Change "O'Hagen" to "O\'Hagen".
B. Change " NULL " to ' NULL ' .
C. Change " NULL " to NULL.
D. Change "O'Hagen" to 'o\'Hagen'.
E. Change DATE () to DAY ().
F. Change date () to CURRENT_TIMESTAMP () .

Answer: C,E

NEW QUESTION # 28
Which two are true about MySQL connectors?

A. Connector/J is based on Connector/C.
B. Connector/ODBC is available on Unix, Windows, and MacOS X.
C. Connector/NET runs on the Windows platform only.
D. Connectors must be installed on both the client and server hosts.
E. Connector/Python is released in precompiled binary and source code.

Answer: A,D

NEW QUESTION # 29
Examine this statement which has executed successfully:

A. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.
B. The statement takes advantage of index description_idx.
C. No index will improve statement performance.
D. Execution performance can be improved by using like instead of RLIKE.
E. Execution performance can be improved by adding an index on column description.

Answer: D

NEW QUESTION # 30
Which change will prevent negative ages to be inserted into the people table?

A. DELIMITER //
CREATE TRIGGER agecheck BEFORE INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN SET NEW.age =0; END IF;// DELIMITER ;
B. ALTER TABLE people ADD COLUMN valid_age=ABS(check_age) GENERATED ALWAYS;
C. DELIMITER //
CREATE TRIGGER age check AFTER INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN SET NEW.age =0; END IF;// DELIMITER;
D. ALTER TABLE people ADD CONSTRAINT check_age CHECK (ABS(age)>=0);

Answer: D

NEW QUESTION # 31
Examine this statement and output:

Now, examine these desired output values:

Which statement updates the table data as require

A. UPDATE exam_result SET score=CEIL(ROUND(score,1));
B. UPDATE exam_result SET score=ROUND(score,1);
C. UPDATE exam_result SET score=TRUNCATE
D. UPDATE exam_result SET score=TRUNCATE(score,1);
E. UPDATE examresult SET score=ROUND(CEIL(score
F. UPDATE exam_result SET score=CEIL(TRUNCATE(sco

Answer: B

NEW QUESTION # 32
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 B
B. Option D
C. Option C
D. Option A

Answer: C

NEW QUESTION # 33
Which two statements are true about AUTO_INCREMENT?

A. AUTO_INCREMENT values allocated to a transaction that is rolled back are not reused.
B. The decimal data type supports AUTO_INCREMENT.
C. A server restart always resets the AUTO_INCREMENT value to largest value in the AUTO_INCREMENT column plus 1.
D. A table can have multiple AUTO_INCREMENT columns.
E. An AUTO_INCREMENT column must be indexed.

Answer: A,E

NEW QUESTION # 34
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 returned because the transaction is auto committed in S2.
B. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
C. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
D. The inserted row is not returned because the transaction still active in s2.

Answer: D

NEW QUESTION # 35
The variables c and d are declared as integer types.
Examine these initialization statements with placeholder value <p1>, which execute successfully:
Now, examine this loop which executes successfully:

Which loop results in the same value of d for all valid values of <p1>?
A)

B)

C)

A. Option A
B. Option C
C. Option B
D. Option D

Answer: A

NEW QUESTION # 36
Examine the appointments table definition which contains one million rows:

Now, examine this statement which executes successfully:

Which statement will improve query performance?

A. ALTER TABLE appointments add index IX_3(attendant_id, created_by)
B. ALTER TABLE appointments add index IX_2(attendant_session_id, created_by)
C. ALTER TABLE appointments add index IX_1(credit,payment)
D. ALTER TABLE appointments add index IX_4<attendant_id, payment, credit)

Answer: D

NEW QUESTION # 37
Examine these statements:
SET collation_connection=utf8mb4_0900_as_cs;
SELECT STRCMPCAlice', UCASE ('Alice* )) ;
What is displayed?

A. 0
B. NULL
C. 1
D. ERROR: 1267 (HYOOO): Illegal mix of collations
E. 2

Answer: C

NEW QUESTION # 38
Examine this table definition:

The table must always remain a valid document store collection. What restriction does this impose on any added column?

A. The column must be a generated column referencing any attribute of doc.
B. The column must have a default value.
C. The column must be a generated column referencing only an existing attribute of doc.
D. The column must be indexed.
E. The column must be used in a unique constraint.

Answer: A

NEW QUESTION # 39
Examine these statements which execute successfully:

Which two changes will improve this query performance?

A. CREATE INDEX 1X4 ON Locations (site_id, loc_shared);
B. CREATE INDEX 1X6 ON users (user_name);
C. CREATE INDEX IX1 ON locations (loc_shareci) ;
D. CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH
E. CREATE INDEX 1X7 ON users (user_name) USING HASH;
F. CREATE INDEX 1X5 ON users (loc_id);
G. CREATE INDEX 1X3 ON locations <loc_site_id) ;

Answer: B,E

NEW QUESTION # 40
Examine this statement which executes successfully:

The table is populated with a range of values including jobs for Robert, John, and Katie. Now, examine this statement and output:

Why is an empty result set returned?

A. The select requires json_unquoteo in the where clause.
B. The virtual values in the name column must be accessed using functions.
C. The json_extract() function requires a length value that matches the field length in the schema.
D. Table statistics must be updated to generate values for the name column.
E. The JSON datatype cannot be used in virtual columns.

Answer: E

NEW QUESTION # 41
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?