This page contains Redis interview questions and answers.

Redis is an open source, advance key-value data store and cache.

It is also referred as a data structure server as it can store hashes, sets, lists, and sorted sets.

Redis stands for **REmote DIctionary Server**.

MySQL is a RDBMS i.e. a SQL database whereas Redis is a NoSQL in-memory data store and cache.

Redis is written in ANSI C.

To interact with Redis we use the `redis-cli`

command (Redis Client) and this connects us with the Redis server.

Following are some of the advantages of Redis.

- It is very fast.
- Supports different data types like hash, set and sorted set.
- Has rich client side libraries.
- Performs atomic operations.

Following are some of the disadvantages of Redis.

- It is single threaded.
- Significant persistence overhead.
- Not widely deployed.
- Limited client support for consistent hashing.

`redis-cli`

is the Redis command line interface.

It is a simple program that allows us to send commands to the Redis server and receive response all in the terminal.

Following are some of the languages supported by Redis.

- PHP
- Python
- C++
- Java
- C#

Following are some of the companies using Redis.

- Stack Overflow
- GitHub

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