Redis Quiz (or) Redis MCQ (Multiple Choice Questions)

1 .

Redis is a?

A)

NoSQL database

B)

End-user database

C)

Commercial database

D)

Relational database

Correct Answer : NoSQL database

Explanation : Redis is a type of database that's commonly referred to as No SQL or non-relational . In Redis, there are no tables, and there's no database-defined or -enforced way of relating data in Redis with other data in Redis.

2 .

Redis Initial release in?

A)

January 10, 2009

B)

March 10, 2009

C)

May 10, 2009

D)

September 10, 2009

Correct Answer : May 10, 2009

3 .

Who develops Redis?

A)

Brad Fitzpatrick

B)

Kevin Young

C)

Fabien Potencier

D)

Salvatore Sanfilippo

Correct Answer : Salvatore Sanfilippo

Explanation : The project was developed and maintained by Salvatore Sanfilippo, starting in 2009. From 2015 until 2020, he led a project core team sponsored by Redis Labs. Salvatore Sanfilippo left Redis as the maintainer in 2020. It is open-source software released under a BSD 3-clause license.

4 .

Redis is a NoSQL database, which stores the value in ____ format.

A)

Graph format

B)

Key-value store

C)

Document format

D)

Column-oriented

Correct Answer : Key-value store

Explanation : Redis is a NoSQL database, which stores the value in key-pair format.

5 .

Redis architecture contains how many processes?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : Redis architecture mainly consists of two processes which are known as Redis client and Redis server.

6 .

Which process in the Redis architecture is responsible for storing the data in memory and is also responsible for controlling every type of management?

A)

Redis client

B)

Redis server.

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Redis server.

Explanation : The redis server is the main part of the architecture, it is used to store the data in memory and is also responsible for controlling every type of management.

7 .

Which of the following DB is known to be a flash-optimized in-memory NoSQL Database?

A)

Redis

B)

MongoDB

C)

Aerospike

D)

ElasticSearch

Correct Answer : Aerospike

Explanation : Aerospike is known to be a flash-optimized in-memory NoSQL Database.

8 .

Which of the following DB purposes is to store and analyze data?

A)

Redis

B)

MongoDB

C)

Memcached

D)

ElasticSearch

Correct Answer : ElasticSearch

Explanation : Elasticsearch is a tool whose purpose is to store and analyze data.

9 .

Which of the following is true about Redis?

A)

Redis is an open source

B)

Redis advanced key-value store

C)

Redis scalable web applications

D)

All of the above

Correct Answer : All of the above

Explanation : Redis is an open source, advanced key-value store and an apt solution for building highperformance, scalable web applications.

10 .

Redis is very fast and can perform about ___________ SETs per second?

A)

10000

B)

110000

C)

111000

D)

1000000

Correct Answer : 110000

Explanation : Redis is very fast and can perform about 110000 SETs per second, about 81000 GETs per second.

11 .

Which of the following data structures are supported by Redis?

A)

Bitmaps

B)

Hyper log

C)

Geospatial indexes

D)

All of the above

Correct Answer : All of the above

Explanation : Redis supports a variety of data structures which includes: hashes, sets, lists, sorted sets with range queries, bitmaps, hyper log, and geospatial indexes.

12 .

In which language, Redis has written?

A)

PHP

B)

Java

C)

ANSI C language

D)

Python

Correct Answer : ANSI C language

Explanation : Redis is written in the ANSI C language.

13 .

Which server-side scripting language does MongoDB use?

A)

JAVASCRIPT

B)

LUA

C)

JAVA

D)

ANSI C

Correct Answer : JAVASCRIPT

Explanation : MongoDB uses JAVASCRIPT as its scripting language.

14 .

In which language, MongoDB has been written?

A)

C++

B)

Java

C)

Python

D)

ANSI C language

Correct Answer : C++

Explanation : MongoDB is written in the C++ language.

15 .

Which type of value-storing model does MongoDB support?

A)

Graph store model

B)

Document store model

C)

Key-value store model

D)

Column-oriented store model

Correct Answer : Document store model

Explanation : MongoDB supports a document store model.

16 .

Which of the following is correct syntax of Redis CONFIG command?

A)

CONFIG PUT CONFIG_SETTING_NAME

B)

CONFIG SET CONFIG_SETTING_NAME

C)

CONFIG GET CONFIG_SETTING_NAME

D)

All of the above

Correct Answer : CONFIG GET CONFIG_SETTING_NAME

Explanation : The basic syntax of Redis CONFIG command : CONFIG GET CONFIG_SETTING_NAME

17 .

To update configuration, you can edit redis.conf file directly or you can update configurations via?

A)

CONFIG put command

B)

CONFIG set command

C)

CONFIG alter command

D)

CONFIG update command

Correct Answer : CONFIG set command

Explanation : To update configuration, you can edit redis.conf file directly or you can update configurations via CONFIG set command.

18 .

Which of the following file available at the root directory of Redis?

A)

redis.set

B)

redis.txt

C)

redis.conf

D)

redis.config

Correct Answer : redis.conf

Explanation : In Redis, there is a configuration file (redis.conf) available at the root directory of Redis.

19 .

Does Redis support languages like Scala and Smalltalk?

A)

Yes

B)

No

C)

Can not say

D)

--

Correct Answer : Yes

Explanation : Redis supports a variety of languages such as C, C++, C#, Clojure, Common Lisp, D, Dart, Erlang, Go, Haskell, Haxe, Io, Java, JavaScript (Node.js), Julia, Lua, Objective-C, Perl, PHP, Pure Data, Python, R, Racket, Ruby, Rust, Scala, Smalltalk, and Tcl.

20 .

Among Redis and RDBMS, which of them stores the data in primary memory?

A)

RDBMS

B)

Redis

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Redis

Explanation : Redis stores almost everything in primary memory whereas RDBMS stores everything in secondary memory.

21 .

Among Memcached and Redis, which is more efficient in handling the traffic?

A)

Memcached

B)

Redis

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Memcached

Explanation : Memcached is good at handling traffic whereas Redis cannot handle heavy traffic.

22 .

What is Memcached?

A)

Memcached is an in-memory document store.

B)

Memcached is an in-memory graph store.

C)

Memcached is an in-memory column-oriented store.

D)

Memcached is an in-memory key-value store.

Correct Answer : Memcached is an in-memory key-value store.

23 .

In which type of partitioning, data is stored in different Redis instances using hashed keys to convert them into numbers?

A)

Range Partitioning

B)

Hash Partitioning

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Hash Partitioning

Explanation : In hash partitioning, data is stored in different Redis instances using hashed keys to convert them into numbers.

24 .

How many types of data types redis supports?

A)

3

B)

4

C)

5

D)

6

Correct Answer : 5

Explanation : Redis supports 5 types of data types : Strings, Hashes, Lists, Sets, Sorted Sets.

25 .

A string value can be at max ________ megabytes in length.

A)

128

B)

256

C)

512

D)

1024

Correct Answer : 512

Explanation : A string value can be at max 512 megabytes in length.

26 .

Which of the following commands is used in Redis to store a key name in the string format?

A)

Set

B)

Get

C)

Put

D)

Post

Correct Answer : Set

Explanation : Set command is used in Redis to store a key name in the string format.

27 .

Which data type in Redis are maps between string fields and string values?

A)

Hashes

B)

Sets

C)

Lists

D)

Sorted Sets

Correct Answer : Hashes

Explanation : Hashes data types in Redis are maps between string fields and string values.

28 .

Which of the following commands is used to set the specified fields to their particular values in the hash stored at the key?

A)

Set

B)

HMSET

C)

Get

D)

HMGET

Correct Answer : HMSET

Explanation :

HMSET command is used to set the specified fields to their particular values in the hash stored at the key.

29 .

In which type of partitioning, specific Redis instances are mapped to ranges of objects?

A)

Hash Partitioning

B)

Range Partitioning

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Range Partitioning

Explanation : In Range Partitioning, specific Redis instances are mapped to ranges of objects.

30 .

Which of the following is a key in string?

SET name "freetimelearn"

A)

set

B)

get

C)

name

D)

None of the above

Correct Answer : name

Explaination : SET and GET are Redis commands, name is the key used in Redis and tutorialspoint is the string value that is stored in Redis.

31 .

Which of the following data types are usually known as the unordered collection of strings?

A)

Sets

B)

Lists

C)

Hashes

D)

Strings

Correct Answer : Sets

Explanation : Sets are usually known as the unordered collection of strings in the Redis Database.

32 .

Which of the following commands is used to delete a key?

A)

Dump

B)

Expire

C)

Delete

D)

Del

Correct Answer : Del

Explanation : To delete a key in Redis DEL command is used.

33 .

Which of the following commands will you use if you are asked to find all keys matching the specified pattern?

A)

Like pattern

B)

Like keys Pattern

C)

Keys pattern

D)

None of the above

Correct Answer : Keys pattern

Explanation : If you are asked to find all keys matching with the specified pattern, then the keys pattern is the command you will use.

34 .

Which of the following commands is used to check whether the key exists or not?

A)

Is_key

B)

Is_there

C)

Key_exist

D)

Exist key

Correct Answer : Exist key

Explanation : Exist key command is used to check whether the key exists or not.

35 .

How many types of partitioning are provided by Redis?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation :

Two types of partitioning are provided by Redis :

* Range Partitioning

* Hash Partitioning

36 .

With ____, your Redis data is split between multiple Redis instances so that each one only contains a subset of your keys?

A)

Redis Latency

B)

Redis Partitioning

C)

Redis Security

D)

Redis Pipelining

Correct Answer : Redis Partitioning

Explanation : With partitioning, your Redis data is split between multiple Redis instances so that each one only contains a subset of your keys.

37 .

You can add elements to a Redis List on the?

A)

leaf

B)

Head

C)

Tail

D)

Both (B) and (C)

Correct Answer : Both (B) and (C)

Explanation : You can add elements to a Redis List on the head or on the tail.

38 .

What is time complexity for sets in redis?

A)

O(1)

B)

O(N)

C)

O(N*N)

D)

O(NLOGN)

Correct Answer : O(1)

Explanation : In Redis, you can add, remove, and test for the existence of members in O(1) time complexity.

39 .

Which of the following is an unordered collection of strings?

A)

Lists

B)

Strings

C)

Sets

D)

Sorted Sets

Correct Answer : Sets

Explanation : Redis Sets are an unordered collection of strings.

40 .

Which of the following basic syntax of Redis client?

A)

$redis cli

B)

$redis-cli

C)

$redis client

D)

$redis-client

Correct Answer : $redis-cli

Explanation : Following is the basic syntax of Redis client : $redis-cli

41 .

On which of the following protocols does the Redis server run?

A)

Post office Protocol (POP)

B)

User Datagram Protocol (UDP)

C)

Redis Serialization Protocol (RESP)

D)

All of the above

Correct Answer : Redis Serialization Protocol (RESP)

Explanation : Clients in Redis basically use RESP (Redis Serialization Protocol) to communicate with servers.

42 .

Which of the following commands closes a given client connection?

A)

CLOSE

B)

CLIENT QUIT

C)

CLIENT CLOSE

D)

CLIENT KILL

Correct Answer : CLIENT KILL

Explanation : With the help of CLIENT KILL command the client connection is closed.

43 .

A ____ test is a method of assessing Redis performance by running multiple (n) commands simultaneously.

A)

Redis benchmark

B)

Redis Latency

C)

Redis security

D)

Redis performance

Correct Answer : Redis benchmark

Explanation : A Redis benchmark test is a method of assessing Redis performance by running multiple (n) commands simultaneously.

44 .

We connect to Redis server running on the local machine and execute a command?

A)

help

B)

ping

C)

redis-server

D)

redis-connect

Correct Answer : ping

Explanation : We connect to Redis server running on the local machine and execute a command PING, that checks whether the server is running or not.

45 .

The below command is used to?

DEL freetimelearn

A)

The command is used to set the keys.

B)

The command is used to delete the key.

C)

The command used to delete the command.

D)

None of the above

Correct Answer : The command is used to delete the key.

Explaination : DEL is the command, while letsfindcourse is the key. If the key is deleted, then the output of the command will be (integer) 1, otherwise it will be (integer) 0.

46 .

Which of the following commands is used when you want to retrieve the value of a key?

A)

SET

B)

GETSET

C)

GET

D)

GETRANGE

Correct Answer : GET

Explanation : GET command is used when you want to retrieve the value of a key.

47 .

Which of the following commands is used to get the number of fields in a hash?

A)

HLENS key

B)

HVALS key

C)

HKEYS key

D)

HDEL key field2 [field2]

Correct Answer : HLENS key

Explanation : HLENS key command is used to get the number of fields in a hash.

48 .

Suppose you want to get the value of a hash field stored at the specified key, which of the following commands will you use?

A)

GET key

B)

HVALS key

C)

HKEYS key

D)

HGET key field

Correct Answer : HGET key field

Explanation : HGET Key field command is used if you want to get the value of a hash field stored at the specified key.

49 .

Which of the following commands is used to add the element to a set?

A)

ADD

B)

SADD KEY

C)

ADDSET KEY

D)

SADD key member1 [member2]

Correct Answer : SADD key member1 [member2]

Explanation : SADD key member1 [member2] command is used when you want to add an element to a set.

50 .

Which of the following command used to Sets the expiry of the key after the specified time?

A)

EXISTS key

B)

EXPIRE key seconds

C)

EXPIREAT key timestamp

D)

PEXPIRE key milliseconds

Correct Answer : EXPIRE key seconds

Explanation : EXPIRE key seconds : Sets the expiry of the key after the specified time.

51 .

Which of the following command is used to Changes the key name?

A)

TYPE key

B)

RANDOMKEY

C)

RENAME key newkey

D)

RENAMENX key newkey

Correct Answer : RENAME key newkey

Explanation : RENAME key newkey : Changes the key name.

52 .

Suppose you are asked to intersect multiple sets and store the resulting set in a key, in this situation which of the following commands will you use?

A)

SSTOREINTER destination key1 [key2]

B)

SINTERSTORE destination key1 [key2]

C)

SINTERSECT destination key1 [key2]

D)

INTERSECTSTORE destination key1 [key2]

Correct Answer : SINTERSTORE destination key1 [key2]

Explanation : SINTERSTORE destination key1 [key2] is the command you will use in a situation where you are asked to intersect multiple sets and store the resulting set in a key.

53 .

Which of the following commands will give you the index of a member in a sorted set?

A)

SINDEX KEY

B)

ZINDEX KEY

C)

ZRANK KEY MEMBER

D)

INDEXSORTED KEY MEMBER

Correct Answer : ZRANK KEY MEMBER

Explanation : ZRANK Key member command will give you the index of a member in a sorted set.

54 .

Which of the following commands is the alternative command to create a backup?

A)

BG

B)

BACKUP

C)

BACKUPSAVE

D)

BGSAVE

Correct Answer : BGSAVE

Explanation : BGSAVE command is the other alternative command which will help us to create a backup in Redis.

55 .

Which of the following files is created by executing the SAVE command?

A)

Dump.rdb

B)

Save.rdb

C)

Backup.rdb

D)

Backup.redis

Correct Answer : Dump.rdb

Explanation : Dump.rdb file is created when we execute the SAVE command for the backup.

56 .

Suppose you are asked to remove all the keys from the current database, which of the following commands will you use?

A)

FLUSHDB

B)

FLUSHKEY

C)

FLUSHALL

D)

FLUSHALLKEY

Correct Answer : FLUSHDB

Explanation : FLUSHALL will remove all the keys from the current databases.

57 .

Suppose you are asked to remove all the keys from all databases, which of the following commands will you use?

A)

FLUSHDB

B)

FLUSHALL

C)

FLUSHKEY

D)

FLUSHALLKEY

Correct Answer : FLUSHALL

Explanation : FLUSHALL will remove all the keys from all databases.

58 .

Which of the following commands is used to close the connection?

A)

VACATE

B)

CLOSE

C)

QUIT

D)

DISCLOSE

Correct Answer : QUIT

59 .

In Redis, which of the following commands is used to initiate the transaction?

A)

GO

B)

SET

C)

START

D)

MULTI

Correct Answer : MULTI

Explanation : MULTI command is used to initiate the transaction in Redis.

60 .

In Redis, which of the following commands is used to execute the particular command?

A)

EXE

B)

EXEC

C)

START

D)

EXECUTE

Correct Answer : EXEC

Explanation : EXEC command in Redis is used to execute a particular command.