Apache Cassandra Developer Associate - Exam Practice Tests
()
About this ebook
Who this book is for
• People preparing for the Apache Cassandra Developer Associate exam.
• Developers willing to acquire a certification in the most popular NoSQL wide-column store.
• Those looking to pass with minimal risk the latest $145 DataStax certification exam.
This book contains two original and high-quality practice tests with 60 questions each. They help you practice for DataStax Academy's proctored certification exam, to become a certified Apache Cassandra Developer Associate.
• Each practice test has 60 questions that you can time for 90 minutes, for 70% passing score - just like the real exam.
• Domains mapped to areas from the recommended courses: Architecture, Data Modeling, CQL.
• All questions are original, with detailed explanations and references.
• Questions closely emulate those from the actual exam, without duplicating them.
• Same level of difficulty as the latest exam questions, changed in mid-2020.
• Unlike the real exam, you'll know right away what questions you missed, and what the correct answers are.
• Detailed explanations with external references for any possible choice, in all practice test questions.
• Just like the actual exam, all questions are all single-select, with four possible choices to select from.
• DataStax can provide vouchers to try and retry their exam for FREE, after watching some of their videos.
• Otherwise, the list price has been cut down to $145 US.
This is not an introduction to Apache Cassandra 3 or DataStax Enterprise 6, as you should already have some prior basic knowledge on the product. Follow the previous link and use also the DataStax Academy's recommended materials for this exam.
The live interactive version of this e-book has been implemented on Udemy as a course, with the "Become a Certified Cassandra Developer: Practice Exams" title.
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Apache Cassandra Developer Associate - Exam Practice Tests - Cristian Scutaru
About this Book
Who this book is for
People preparing for the Apache Cassandra Developer Associate exam.
Developers willing to acquire a certification in the most popular NoSQL wide-column store.
Those looking to pass with minimal risk the latest $145 DataStax certification exam.
This is not an introduction to Apache Cassandra 3 or DataStax Enterprise 6, as you should already have some prior basic knowledge on the product. Follow the previous link and use also the DataStax Academy's recommended materials for this exam.
The live interactive version of this e-book has been implemented on Udemy as a course, with the Become a Certified Cassandra Developer: Practice Exams title.
This book contains two original and high-quality practice tests with 60 questions each. They help you practice for DataStax Academy's proctored certification exam, to become a certified Apache Cassandra Developer Associate.
Each practice test has 60 questions that you can time for 90 minutes, for 70% passing score - just like the real exam.
Domains mapped to areas from the recommended courses: Architecture, Data Modeling, CQL.
All questions are original, with detailed explanations and references.
Questions closely emulate those from the actual exam, without duplicating them.
Same level of difficulty as the latest exam questions, changed in mid-2020.
Unlike the real exam, you'll know right away what questions you missed, and what the correct answers are.
Detailed explanations with external references for any possible choice, in all practice test questions.
Just like the actual exam, all questions are all single-select, with four possible choices to select from.
DataStax can provide vouchers to try and retry their exam for FREE, after watching some of their videos.
Otherwise, the list price has been cut down to $145 US.
How you should use these tests
Try first practice test. And do not worry about the time or if you fail. You are expected to fail, this is how you learn...
On a separate piece of paper, mark each question number with your choice.
Quit the exam anytime, if you're not patient enough to go over all 60 questions.
Once you are done, go to the Answers and Explanations section for your test, and check both the right and wrong choices for each individual question.
Read the detailed Explanation for each question.
Go though the References links, to learn more from the source.
The passing score in the real exam is 70%.
Repeat with the second practice test. Don't skip it, as both these tests together cover most types of actual exam questions.
Repeat these tests again and again, until you score at least 90% on each. And then go for the real deal. Good luck!
Practice Test 1
Question 1:
You create the table:
CREATE TABLE Countries (
country text,
state text,
created timestamp,
PRIMARY KEY (country, state, created)
);
Which of the following queries is valid? (select one)
SELECT * FROM Countries
WHERE country='USA'
AND state IN ('Oregon', 'Idaho', 'Montana')
AND created >= '2020-01-01' AND created <= '2020-12-01';
SELECT * FROM Countries
WHERE country='USA'
AND created >= '2020-01-01' AND created <= '2020-12-01';
SELECT * FROM Countries
WHERE state IN ('Oregon', 'Idaho', 'Montana')
AND created >= '2020-01-01' AND created <= '2020-12-01';
SELECT * FROM Countries
WHERE country='USA'
AND state IN ('Oregon', 'Idaho', 'Montana')
AND (created <= '2020-01-01' OR created >= '2020-12-01');
Question 2:
You execute one by one the following statements:
CREATE TABLE Countries (
id timeuuid PRIMARY KEY,
country text
);
INSERT INTO Countries (id, country) VALUES (uuid(), 'USA');
INSERT INTO Countries (id, country) VALUES (uuid, 'UK');
INSERT INTO Countries (id, country) VALUES (timeuuid(), 'France');
INSERT INTO Countries (id, country) VALUES (NOW(), 'Mexico');
INSERT INTO Countries (id, country) VALUES (tOtimeStamp(now()), 'Italy');
How many rows are now in the table? (select one)
Question 3:
What is NOT true about hints? (select one)
Question 4:
What is vertical partitioning? (select one)
Question 5:
How many email entries can have for the same attachment? (select one)
Question 6:
What can you say about the following batch? (select one)
CREATE TABLE countries (
country text,
total_pop int STATIC,
state text,
state_pop int,
PRIMARY KEY (country, state)
);
CREATE TABLE countries_by_pop (
pop int,
country text,
PRIMARY KEY (pop, country)
);
BEGIN BATCH
INSERT INTO countries (country, total_pop) VALUES ('USA', 328000000);
INSERT INTO countries_by_pop (pop, country) VALUES (328000000, 'USA');
APPLY BATCH;
Question 7:
What is a NOT a valid limitation for Cassandra counters? (select one)
Question 8:
Define the primary key for the networks table: (select one)
PRIMARY KEY (name)
WITH CLUSTERING ORDER BY (name ASC)
PRIMARY KEY ((username), description, region, num_sensors)
name text PRIMARY KEY
name PRIMARY KEY text
Question 9:
A Countries table has country and city as primary keys.
What is returned by the following CQL statement? (select one)
DELETE FROM Countries
WHERE country='USA' AND city='Boston'
IF EXISTS;
Question 10:
Consider the table:
CREATE TABLE countries (
country text,
state text,
pop int,
PRIMARY KEY ((country, state))
);
Assuming the table is populated, what can be returned by the SELECT query? (select one)
SELECT * FROM countries
WHERE country='USA' AND state='Oregon';
Question 11:
What is a replication factor? (select one)
Question 12:
What is the most convenient and flexible type to store a few phone numbers per person? (select one)
Question 13:
What happens with the internal data structures when a row gets updated? (select one)
Question 14:
Your dsbulk load operation ended up with the following result:
total | failed | rows/s | p50ms | p99ms | p999ms | batches
94000 | 0 | 94 | 63.92 | 70.25 | 70.25 | 100.10
Operation LOAD_20191113-185907-331567 completed successfully in XXX seconds.
Last processed positions can be found in positions.txt
What is the estimated load time you'll get on in XXX seconds
? (select one)
Question 15:
Which statement about Memtables is NOT true? (select one)
Question 16:
What is a valid table definition for positions_by_account? (select one)
CREATE TABLE positions_by_account (
account text,
symbol text,
quantity int,
PRIMARY KEY ((account, symbol))
);
CREATE TABLE positions_by_account (
account text,
symbol text,
quantity int,
PRIMARY KEY (account, symbol)
) WITH CLUSTERING ORDER BY (symbol ASC);
CREATE TABLE positions_by_account (
account text PRIMARY KEY,
symbol text,
quantity int
) WITH CLUSTERING ORDER BY (account ASC, symbol ASC);
CREATE TABLE positions_by_account (
account text,
symbol text,
quantity int,
PRIMARY KEY (account, symbol ASC)
);
Question 17:
What rows are returned by the last query? (select one)
CREATE TABLE Countries (
country text,
city text,
PRIMARY KEY ((country), city)
) WITH CLUSTERING ORDER BY (city DESC);
INSERT INTO Countries (country, city) VALUES ('USA', 'Seattle');
INSERT INTO Countries (country, city) VALUES ('USA', 'Boston');
INSERT INTO Countries (country) VALUES ('USA');
INSERT INTO Countries (country, city) VALUES ('Canada', 'Vancouver');
SELECT * FROM Countries;
Canada Vancouver
USA Seattle
USA Boston
USA
Canada Vancouver
USA
USA Boston
USA Seattle
Canada Vancouver
USA Boston
USA Seattle
Third INSERT fails with an error.
Question 18:
How to define the primary key of a Country table, if we want individual records by country and state, and filtered lists of cities by a population range?