Redis is an in-memory key value datastore written in ANSI C programming language.It is a data structure server supporting different kinds of values.Redis can be used as a database, caching layer, or a message broker.The key value datastore have the ability to store some data called a value, inside a key.
Redis is a NoSQL database, it facilitates users to store huge amount of data without the limitations of a relational database.It supports various types of data-structures like strings, hashes, lists, sets, stored sets, bitmaps, hyperloglog, and geospatial indexes with radius queries.It is commonly used as a memory caching system or a distributed data shared memory server.
Redis architecture consists of two main processes: Redis client and Redis server.
Redis server stores data in memory and it handles all kinds of management and forms the major part of the architecture.Redis client can be Redis console client or any other programming language’s Redis API.Once restart the computer, we lose all the data stored since it is a volatile memory.Thus it needs a datastore persistence.RDB, AOF and SAVE commands are the ways for Redis persistence.
RDB makes a copy of all the data and stores in permanent memory.AOF logs all the write operations received by the server.Aof files are larger and an expensive task.There are a lot of advantages of using Redis they are listed below
1.Redis will support up to 1 GB of data for a single entry.It allows storing key and value pairs as large as 512 MB.Redis supports Pipelining of commands and facilitates you to use multiple values in a single command to speed up communication with the client libraries.
2.Redis stores data in the form of a key and a map that is string fields and string values.It uses a mechanism called Redis hashing.
3. Redis offers data replication.In a replication environment many computers share the same data with each other so that even if few computers go down, all the data will be available.
4.Since Redis can be used to set up efficient replication, at any point in time, the cache service will be up-and-running, even if any of the slave nodes are down. However, the nodes are resilient and will overcome the failure and continue providing service.
6.It allows inserting huge amount of data into its cache.mass insertion can be done using Redis.
7.Redis supports transactions, which means that commands can be executed as a queue instead of executing one at a time.
8.Redis uses a protocol called RESP, Redis serialization protocol which communicates with its server.
9.It is portable. Redis is written in ANSI C and works in most POSIX systems like Linux, BSD, Mac OS X, Solaris, and so on. Redis is reported to compile and work under WIN32 if compiled with Cygwin, but there is no official support for Windows currently.
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