Redis Cache Interview Questions and Answers

Ques 6. How to interect with Redis?

After the installation of the server you can run the Redis Client provided by redis installation or you can open the command prompt and use the following command:

redis-cli  

Ques 7. Which are the most popular companies using Redis?

Twitter, Github, Stackoverflow etc. are the most popular companies using Redis.

Ques 8. What are the main features of Redis?

Following are the main features of Redis:

• Redis is very simple to install setup and manage.
• Redis is very fast. It can execute 100000 queries per second.
• Redis is fast because data is being persistent in memory as well as stored on the disk.
• Redis is very fast because it loads the whole dataset in primary memory.
• Redis operations working on different data types are atomic so these operations can be accomplished safely i.e. to set or increase a key, add or remove elements from a set or increase a counter.
• It supports various types of data structure such as strings, hashes, sets, lists, sorted sets etc.
• Redis supports a variety of languages i.e. C, C++, C#, Ruby, Python, Twisted Python, PHP, Erlang, Tcl, Perl, Lua, Java, Scala etc.
• If your favorite language is not supported yet, you can write your own client library, as the Protocol is pretty simple.
• Redis supports simple master to slave replication.
• Redis is portable.

Ques 9. Explain the Replication Features of Redis?

Replication is important in order to archive high level of availability in big data systems. The data needs to be replicated at n number of places. This follows the master-slave approach where the master copy is maintained by master-slave and replicated to n other nodes.

Ques 10. What are the advantages of using Redis?

Following is a list of some important advantages of Redis:

• Redis is very fast.
• It supports a server-side locking.
• It has a rich client side library.
• It is a good counter.
• It supports Atomic Operation.