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Redis Certified Developer: Exam Practice Tests
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2020
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Redis Certified Developer

Exam Practice Tests

Cristian Scutaru

Table of Contents

About this Book

Who this course is for

People preparing for the Redis Certified Developer exam.
Developers willing to acquire a certification in most popular key-value store.
Those looking to pass with minimal risk the $120 Redis certification exam.

This is not an introduction to Redis, as you should already have some prior basic knowledge on the product. Follow the previous link and use also the Redis 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 Redis Certified Developer: Practice Exams title.

This book contains two original and high-quality practice tests of 80 questions each, to help you become a Redis Certified Developer. You must pass a required proctored exam, maintained by Redis University, a department of Redis Labs.

All questions are closely emulated from those currently found in the actual exam, so you'll not waste time on anything else.
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 each practice test question.
Specifics of the real exam:
- 80 questions
- 90 minutes time limit
- 72% passing score (500/700, max 22 questions wrong)
- $120 US per exam trial
4 choices per question: most are single-choice, a few with multiple-selections.
Domains or categories: General, Keys, Data Structures, Data Modeling, Debugging, Performance , Clustering . The large majority of questions test your knowledge on Data Structures and Data Modeling, through Redis commands.

How you should use these tests

Try first practice test. And do not worry about any time limit or if you fail. You are expected to fail, this is how you learn...
Stop the exam anytime, if you're not patient enough to go over all 80 questions.
The passing score is at 72%. 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 (remember these!).
Read the detailed Explanation for each question. This is something else you don't have at the actual exam...
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:

Which features are included in all Redis editions? (check all that apply)

A) Redis Sentinel

B) Active-Active

C) Redis on Flash

D) Redis Cluster

Question 2:

Which data is directly changed by the execution of the following command? (select one)

SET mykey myvalue

A) The key store from the RDB file, if snapshotting is enabled

B) Data from RAM

C) Transactions from the AOF journal, when enabled

D) Data from the virtual memory

Question 3:

Based on its computational complexity, which is the most performant algorithm? (select one)

A) O(n)

B) O(n*log(n))

C) O(log(n))

D) O(n*n)

Question 4:

How do you interpret the following CLI command: (select one)

$ redis-cli --raw incr mycounter

A) This is an inline statement.

B) This asks Redis commands to display simple output.

C) This executes a different kind of INCR command.

D) This is not a valid CLI command.

Question 5:

What configuration technique allows you to "hide" Redis commands from the CLI tools? (select one)

A) Disable sets of commands.

B) Rename commands.

C) Assume a different role.

D) Limit privileges.

Question 6:

How do you check if a key exists, in the most efficient way? (select one)

A) GET key and check if it is nil

B) EXISTS key

C) parse the returned KEYS collection

D) with SCAN

Question 7:

What is the final value of a? (select one)

INCR a

INCR A

DECR a

A) nil

B) 0

C) 1

D) 3

Question 8:

You execute an INCR command on a non-existent key.

What will INCR return? (select one)

A) 0

B) 1

C) -1

D) nil

Question 9:

Rename a key, but only if it does not already exist: (select one)

RENAME NX key newkey

RENAMENX key newkey

RENAME key newkey

MOVE key newkey

Question 10:

What are the Redis modules? (select one)

A) Libraries in different languages, with a standard plugin interface.

B) Dynamic C libraries, loaded and executed within the same process.

C) External add-ons, executed in separate processes.

D) Distributed programs with extended Redis functionality.

Question 11:

What will be the value of k3? (select one)

SET k1 1000

SET k2 1011

BITOP AND k3 k1 k2

GET k3

A) 0

B) 1011

C) nil, because the values are strings, not bits

D) 1000

Question 12:

What is NOT true about the GETSET command? (select one)

A) Returns no error when key exists but does not hold a string value.

B) Returns an error when key exists but does not hold a string value.

C) Atomically sets key to value and returns the old value stored at key.

D) Has an O(1) time complexity.

Question 13:

If a key is renamed with RENAME: (select one)

A) The associated TTL is lost.

B) The associated TTL is transferred to the new key name.

C) An error is thrown if the key has a TTL.

D) Cannot rename keys with expire time set.

Question 14:

What kind of values return check commands like EXISTS or SISMEMBER? (select one)

A) True or False

B) 1 or 0

C) True or nil

D) OK or an empty string

Question 15:

Which AOF journal approach is the most durable, but least performant? (select one)

A) Do not use an AOF journal at all.

B) Write once every second.

C) Written periodically by the operating system.

D) Append on every write.

Question 16:

Which command has a logarithmic complexity? (select one)

A) SINTER

B) ZADD

C) LTRIM

D) SCARD

Question 17:

Which BITFIELD OVERFLOW option sets the value to either the minimum or maximum integer value, depending on the underflow or overflow status? (select one)

A) WRAP

B) SAT

C) MINMAX

D) FAIL

Question 18:

What is a Bloom Filter? (check all that apply)

A) A special data structure implemented by RedisBloom.

B) A special check implemented with BF.EXISTS

C) A probabilistic data structure that can tell if an item has never been added previously.

D) An alternative to SISMEMBER.

Question 19:

Which of the following multi-key operations are still allowed in a Redis Cluster? (select one)

A) GEORADIUS

B) transactions and Lua scripts

C) FLUSHDB and FLUSHALL

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