Download Exam 1Z0-909 Practice Test Questions with 100% Verified Answers [Q28-Q50]

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NEW QUESTION # 28
Examine these statements which execute successfully:

The statements executed without exception. Which two are true?

• A. No transaction commits.
• B. One row is inserted into band.
• C. No row is inserted into band.
• D. Two transactions commit.
• E. The transaction is rolled back to the savepoint.

Answer: A,B

NEW QUESTION # 29
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 name FROM col WHERE season = 1;
• B. SELECT "S.name" FROM col WHERE "S.season" = "1";
• C. SELECT doc->,$.name,, FROM col WHERE doc->"$ . season" = "1";
• D. SELECT doc->"$.name" FROM col WHERE doc->"$.season" = "1";

Answer: B

NEW QUESTION # 30
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(TRUNCATE(sco
• B. UPDATE exam_result SET score=TRUNCATE(score,1);
• C. UPDATE exam_result SET score=ROUND(score,1);
• D. UPDATE examresult SET score=ROUND(CEIL(score
• E. UPDATE exam_result SET score=CEIL(ROUND(score,1));
• F. UPDATE exam_result SET score=TRUNCATE

Answer: C

NEW QUESTION # 31
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 # 32
Examine these statements and output:

Now, examine this command:
Mysql> ROLLBACK;
What is true about the effect of the command?

• A. It returns an error because there is no active transaction.
• B. It has no effect.
• C. It undoes both insert and update commands.
• D. It undoes the insert command.
• E. It undoes the update command.

Answer: D

NEW QUESTION # 33
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 A
• C. Option C
• D. Option D

Answer: C

NEW QUESTION # 34
You must reclaim memory used by a prepared statement named prep. Which two achieve this?

• A. SET @a = ''; EXECUTE prep USING @a;
• B. DEALLOCATE PREPARE prep?
• C. SET @prep = NULL;
• D. DROP PREPARE prep;
• E. DROP PROCEDURE prep;
• F. PREPARE prep FROM '';

Answer: C,E

NEW QUESTION # 35
Examine these statements issued from Session 1 which execute successfully:

Now, examine this statement issued from Session 2:

What is the outcome of the update statement in Session 2?

• A. The row will be updated immediately.
• B. The transaction in Session 1 will be rolled back automatically.
• C. A deadlock will occur.
• D. The statement will wait for the transaction in Session 1 to finish.

Answer: B

NEW QUESTION # 36
Examine these statement which execute successfully:

Now, examine the statements executed in the mysqi command-line client:

What is true?

• A.
• B.
• C.
• D.

Answer: C

NEW QUESTION # 37
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. Execution succeeds with a warning.
• B. An error is generated because the index prevents changes to the column.
• 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: B

NEW QUESTION # 38
Examine this event's metadata:

Now examine this command:
DROP USER 'userl'e'localhost';
Which effect will the command have on the event?

• A. The event is not scheduled and will no longer execute. The system will log an error.
• B. The event is scheduled but will no longer execute. The system will log an error.
• C. The event is scheduled and executed but fails. The system will log an error.
• D. The event will be dropped without an error or warning.

Answer: B

NEW QUESTION # 39
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)

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

Answer: C

NEW QUESTION # 40
Examine the output:

Which explain command will obtain the output?

• A. EXPLAIN FORMAT=TREE
• B. EXPLAIN ANALYZE
• C. EXPLAIN PARTITIONS
• D. EXPLAIN PORMAT=JSON
• E. EXPLAIN PORMAT^TRADITIONAL

Answer: D

NEW QUESTION # 41
Examine this statement which has executed successfully:

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

Answer: E

NEW QUESTION # 42
Examine the employee table structure:

Which set of statements immediately returns empname for a given emp_id by using a parameterized prepare statement?
A)



D)

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

Answer: D

NEW QUESTION # 43
Which change will prevent negative ages to be inserted into the people table?

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

Answer: A

NEW QUESTION # 44
Examine this statement:

• A. Inserting COMMIT; SET @m :=: before line 4
• B. user who creates the procedure needing the create routine privilege
• C. user who creates the procedure needing the create and execute privileges
• D. Inserting DEFINER 'username '@' localhost' clause into the CREATE PROCEDURE statement
• E. inserting USE <database >; before line 3

Answer: D

NEW QUESTION # 45
You are using buffered queries with PHP mysqli in a browser-based web application. Which three are true?

• A. Buffered queries are enabled by default.
• B. Results are sent to the calling PHP process for buffering.
• C. Results are sent from the server to the browser for buffering.
• D. Buffered queries should be used on large tables when the result size is unknown.
• E. Additional queries on the same session are blocked until the result set is released.
• F. Buffered queries must be explicitly enabled using mysqliuseresult.
• G. Large results can have a negative impact on performance.

Answer: D,F,G

NEW QUESTION # 46
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 DATETIME duration TIME
• B. start_time TIMESTAMP duration TIMESTAMP
• C. start_time TIMESTAMP duration TIME
• D. start_time DATETIME duration DATETIME
• E. start_time TIME duration TIME

Answer: D

NEW QUESTION # 47
Examine these statements which execute successfully:

Which two changes will improve this query performance?

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

Answer: D,E

NEW QUESTION # 48
Examine these statements:
SET collation_connection=utf8mb4_0900_as_cs;
SELECT STRCMPCAlice', UCASE ('Alice* )) ;
What is displayed?

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

Answer: B

NEW QUESTION # 49
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 does not start a transaction.
• B. Session 1 does not block Session 2.
• C. Statements in Session 2 are committed.
• D. Session 2 takes an exclusive lock on all the rows in the band table.
• E. Session 1 takes a shared lock on all the rows in the band table.
• F. Session 1 must commit before the update in Session 2 can complete.

Answer: C,F

NEW QUESTION # 50
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