Top 50 Redis Interview Questions with Answers

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What is Redis?
a) A relational database
b) A NoSQL database
c) A graph database
d) A document database

Answer: b

What is the data structure used by Redis?
a) JSON
b) XML
c) Key-Value
d) Relational

Answer: c

What is the maximum size of the key in Redis?
a) 256 MB
b) 512 MB
c) 1 GB
d) 2 GB

Answer: b

What is the maximum number of Redis databases that can be created?
a) 15
b) 16
c) 18
d) 20

Answer: b

Which command is used to get the value of a key in Redis?
a) Get
b) Set
c) Mget
d) Hget

Answer: a

Which command is used to set the value of a key in Redis?
a) Get
b) Set
c) Mget
d) Hget

Answer: b

Which data structure is used to store sorted data in Redis?
a) Set
b) List
c) Hash
d) Sorted Set

Answer: d

Which Redis data structure is similar to a Dictionary in Python?
a) Set
b) List
c) Hash
d) Sorted Set

Answer: c

Which command is used to add an element to a Set in Redis?
a) Add
b) Set
c) Sadd
d) Sset

Answer: c

Which command is used to remove an element from a Set in Redis?
a) Remove
b) Del
c) Srem
d) Hrem

Answer: c

Which command is used to get the length of a List in Redis?
a) Length
b) Count
c) Len
d) Llen

Answer: d

Which command is used to add an element to the beginning of a List in Redis?
a) Lpush
b) Rpush
c) Lpop
d) Rpop

Answer: a

Which command is used to add an element to the end of a List in Redis?
a) Lpush
b) Rpush
c) Lpop
d) Rpop

Answer: b

Which Redis data structure is similar to a stack in programming?
a) Set
b) List
c) Hash
d) Sorted Set

Answer: b

Which Redis data structure is similar to a queue in programming?
a) Set
b) List
c) Hash
d) Sorted Set

Answer: b

Which data structure is used to store a value with an expiration time in Redis?
a) Set
b) List
c) Hash
d) Sorted Set

Answer: c

Which command is used to set the expiration time of a key in Redis?
a) Expire
b) SetEx
c) Pexpire
d) PsetEx

Answer: d

Which command is used to remove the expiration time of a key in Redis?
a) Expire
b) Persist
c) Pexpire
d) Ppersist

Answer: b

Which command is used to get the remaining time for a key with an expiration time in Redis?
a) Ttl
b) Ltt
c) Pttl
d) Pltt

Answer: c

Which command is used to increment a value in Redis by a certain amount?
a) Incr
b) IncrBy
c) Decr
d) DecrBy

Answer: b

Which command is used to get the value of multiple keys in Redis?
a) Get
b) Mget
c) Hget
d) Smget

Answer: b

Which command is used to set the value of multiple keys in Redis?
a) Set
b) Mset
c) Hset
d) Smset

Answer: b

Which command is used to check if a key exists in Redis?
a) Exists
b) Check
c) KeyExists
d) KeyCheck

Answer: a

Which command is used to get all the keys in Redis?
a) Keys
b) AllKeys
c) GetKeys
d) ListKeys

Answer: a

Which command is used to delete a key in Redis?
a) Delete
b) Remove
c) Del
d) Rem

Answer: c

Which command is used to delete multiple keys in Redis?
a) Delete
b) Remove
c) Del
d) Mdel

Answer: d

Which command is used to get the size of a Set in Redis?
a) Length
b) Count
c) Size
d) Scard

Answer: d

Which command is used to get the members of a Set in Redis?
a) Members
b) GetMembers
c) Smembers
d) SetMembers

Answer: c

Which command is used to check if an element exists in a Set in Redis?
a) Exists
b) Check
c) Sexists
d) SetExists

Answer: c

Which command is used to get the intersection of two Sets in Redis?
a) Intersect
b) Sinter
c) Union
d) Sunion

Answer: b

Which command is used to get the union of two Sets in Redis?
a) Intersect
b) Sinter
c) Union
d) Sunion

Answer: d

Which command is used to get the difference of two Sets in Redis?
a) Diff
b) Sdiff
c) SDiffStore
d) SetDiff

Answer: b

Which command is used to move an element from one Set to another in Redis?
a) Move
b) Transfer
c) Smove
d) Stransfer

Answer: c

Which command is used to add an element to a Sorted Set in Redis?
a) Add
b) Set
c) Zadd
d) Zset

Answer: c

Which command is used to remove an element from a Sorted Set in Redis?
a) Remove
b) Del
c) Zrem
d) Zdel

Answer: c

Which command is used to get the range of elements in a Sorted Set in Redis?
a) Range
b) GetRange
c) Zrange
d) SetRange

Answer: c

Which command is used to get the rank of an element in a Sorted Set in Redis?
a) Rank
b) GetRank
c) Zrank
d) SetRank

Answer: c

Which command is used to get the score of an element in a Sorted Set in Redis?
a) Score
b) GetScore
c) Zscore
d) SetScore

Answer: c

Which command is used to increment the score of an element in a Sorted Set in Redis?
a) Incr
b) IncrBy
c) Zincr
d) ZincrBy

Answer: d

Which command is used to get the size of a Sorted Set in Redis?
a) Length
b) Count
c) Size
d) Zcard

Answer: d

Which command is used to get the members of a Sorted Set in Redis?
a) Members
b) GetMembers
c) Zmembers
d) SortedMembers

Answer: c

Which command is used to get all the values in Redis?
a) Values
b) AllValues
c) GetValues
d) ListValues

Answer: a

Which command is used to get the random key in Redis?
a) Random
b) GetRandom
c) KeyRandom
d) RandomKey

Answer: d

Which command is used to get the random element from a Set in Redis?
a) Random
b) GetRandom
c) Srandom
d) Srandmember

Answer: d

Which command is used to get the random element from a Sorted Set in Redis?
a) Random
b) GetRandom
c) Zrandom
d) Zrandmember

Answer: d

Which command is used to flush all the data in Redis?
a) FlushAll
b) Flush
c) Clear
d) Truncate

Answer: a

Which command is used to backup Redis data?
a) Backup
b) Save
c) Export
d) Dump

Answer: d

Which command is used to restore Redis data?
a) Restore
b) Load
c) Import
d) Recover

Answer: a

Which command is used to check the Redis server status?
a) Status
b) CheckServer
c) Ping
d) Health

Answer: c

Which command is used to shutdown the Redis server?
a) Shutdown
b) Stop
c) End
d) Quit

Answer: a

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Ashwani Kumar

Sr. Software Engineer at Cotocus Private Limited

There is no end to education. It is not that you read a book, pass an examination, and finish with education. The whole of life, from the moment you are born to the moment you die, is a process of learning.