Most Recent Oracle 1Z0-909 Exam Dumps

Prepare for the Oracle MySQL 8.0 Database Developer exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

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The questions for 1Z0-909 were last updated on May 2, 2025.

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Question No. 1

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?

Astart_time TIMESTAMP duration TIMESTAMP

Bstart_time TIMESTAMP duration TIME

Cstart_time DATETIME duration DATETIME

Dstart_time TIME duration TIME

Estart__time DATETIME duration TIME

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Correct Answer: C

Question No. 2

Which change will prevent negative ages to be inserted into the people table?

ADELIMITER //
CREATE TRIGGER agecheck BEFORE INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN
SET NEW.age =0; END IF;//
DELIMITER ;

BALTER TABLE people ADD COLUMN valid_age=ABS(check_age) GENERATED ALWAYS;

CDELIMITER //
CREATE TRIGGER age check AFTER INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN
SET NEW.age =0; END IF;//
DELIMITER;

DALTER TABLE people ADD CONSTRAINT check_age CHECK (ABS(age)>=0);

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Correct Answer: D

Question No. 3

How does InnoDB choose deadlock victims in MySQL?

AIt chooses the transaction with the lowest transaction ID.

BIt chooses the transaction with the least accumulated CPU time.

CIt chooses the transaction with the most accumulated CPU time.

DIt chooses the transaction randomly.

EIt chooses the transaction with the most modified rows.

FIt chooses the transaction with the fewest modified rows.

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Correct Answer: D

Question No. 4

Examine this statement which executes successfully:

CREATE TABLE 'fshop' ('product' JSON DEFAULT NULL ) ENGINE=InnoDB;

Now, examine a json value contained in the table:

{"name" : "orange", "varieties" : [{"VarietyName":"Clementine", "Origin" : ["PA", "BU"] }, {"VarietyName": "tangerine", "Origin" : ["CH","JP"]>]>

Which will cause documents to be indexed over the 'name' key?

AALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product-
>* S .varieties. VarietyName ' ) VIRTUAL, ADD KEY idx_name (name.) ;

BALTER TABLE fshop ADD COLUMN name VARCHAR(100) AS (product->' S - varieties' ) VIRTUAL, ADD KEY idx_name (name) ;

CALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product->' S - name' ) VIRTUAL, ADD KEY idx_name (name) ;

DALTER TABLE fshop ADD COLUMN name VARCHAR(20), ADD KEY idx_name (name) ;

EALTER TABLE fshop ADD name VARCHAR(20) AS (JSON_ONQUOTE (product->'S.varieties.VarietyName')), ADD INDEX (name);

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Correct Answer: B

Question No. 5

Examine this statement which has executed successfully:

AExecution performance can be improved by using like instead of RLIKE.

BThe statement takes advantage of index description_idx.

CExecution performance can be improved by, using a composite index with column description as the leftmost prefix column description.

DNo index will improve statement performance.

EExecution performance can be improved by adding an index on column description.

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Correct Answer: A

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