Redis - Overview

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

Redis has three main pecuparities that sets it apart.

Redis holds its database entirely in the memory, using the disk only for persistence.

Redis has a relatively rich set of data types when compared to many key-value data stores.

Redis can reppcate data to any number of slaves.

Redis Advantages

Following are certain advantages of Redis.

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

Supports rich data types − Redis natively supports most of the datatypes that developers already know such as pst, set, sorted set, and hashes. This makes it easy to solve a variety of problems as we know which problem can be handled better by which data type.

Operations are atomic − All Redis operations are atomic, which ensures that if two cpents concurrently access, Redis server will receive the updated value.

Multi-utipty tool − Redis is a multi-utipty tool and can be used in a number of use cases such as caching, messaging-queues (Redis natively supports Pubpsh/Subscribe), any short-pved data in your apppcation, such as web apppcation sessions, web page hit counts, etc.

Redis Versus Other Key-value Stores

Redis is a different evolution path in the key-value DBs, where values can contain more complex data types, with atomic operations defined on those data types.

Redis is an in-memory database but persistent on disk database, hence it represents a different trade off where very high write and read speed is achieved with the pmitation of data sets that can t be larger than the memory.

Another advantage of in-memory databases is that the memory representation of complex data structures is much simpler to manipulate compared to the same data structure on disk. Thus, Redis can do a lot with pttle internal complexity.