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Redis Cache Interview Questions and Answers

Ques 11. What are the disadvantages/limitations of using Redis?

Following are the disadvantages/ limitations of Redis:

  • It is single threaded.
  • It has got limited client support for consistent hashing.
  • It has significant overhead for persistence.
  • It is not deployed widely.

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Ques 12. What is the difference between Redis and RDBMS?

There are a lot of differences between Redis and RDBMS:

  • Redis is a NoSQL database while RDBMS is an SQL database.
  • Redis follows the key-value structure while RDBMS follows the table structure.
  • Redis extremely fast while RDBMS is comparatively slow.
  • Redis stores all the dataset in primary memory while RDBMS stores its dataset in secondary memory.
  • Redis is generally used to store small and frequently used files while RDBMS is used to store big files.
  • Redis provides only official support for Linux, BSD, Mac OS X, Solaris. It doesn?t provide official support for Windows currently while RDBMS provides support for both.

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Ques 13. Differentiate Memcached and Redis?

MemcachedRedis
Memcached only does caching information.It provides some more functionalities like replication and persistence along with caching information.
Memcached supports the functionality of LRU (Least Recently Used) eviction of values.LRU is not supported by Redis.
In Memcached, when they overflow memory, the one you have not used recently (LRU- Least Recently Used) will get deleted.In Redis, there is a time set for each function, Three keys are maintained, the one, which is closest to expiry, will get deleted.
CAS (Check and Set) is supported by Memcached.CAS is not supported by Redis.
Array objects are needed to be serialized in order to get saved. We need to unserialize them for their retrieval.Redis has got stronger data structures; it can handle strings, binary safe strings, list of binary safe strings, sorted lists, etc.
Memcached has at most 250 bytes length.Redis has at most 2 GB key length.
It is Multi-threadedIt is single threaded.

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Ques 14. Mention Operation Keys of Redis.

  • TYPE key
  • TTL key
  • EXPIRE key seconds
  • EXPIREAT key timestamp
  • EXISTS key
  • DEL key

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Ques 15. Which are the different data types used in Redis?

There are mainly 5 types of data types supported by Redis:

  • Strings
  • Hashes
  • Lists
  • Sets
  • Sorted Sets

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