Redis is a very fast, open source, written in ANSI C language, supports network, can be memory-based and persistent, log-type, non-relational, Key-Value database, and provides APIs in multiple languages. .
#Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of key/value storage such as memcached, and can play a very good supplementary role to relational databases in some situations. It provides Java, C/C, C#, PHP, JavaScript, Perl, Object-C, Python, Ruby, Erlang and other clients, which is very convenient to use. (Recommended learning: Redis video tutorial)
Redis supports master-slave synchronization. Data can be synchronized from the master server to any number of slave servers, and the slave server can be a master server associated with other slave servers. This allows Redis to perform single-level tree replication. Saving can write data intentionally or unintentionally. Since the publish/subscribe mechanism is fully implemented, when the slave database synchronizes the tree anywhere, it can subscribe to a channel and receive the complete message release record of the master server. Synchronization is helpful for scalability and data redundancy of read operations.
Main features of Redis
Advanced data structure: Provides five possible data types for values: string, Lists, sets, hashes and sorted sets. Operations unique to these data types are provided and have well-documented time complexity (Big O notation).
High Performance: Due to its in-memory nature, the project maintainers' commitment to keeping complexity to a minimum, and its event-based programming model, Redis has excellent performance for read and write operations.
Lightweight with no dependencies: Written in ANSI C with no external dependencies. Works in all POSIX environments. Windows is not officially supported, but Microsoft offers an experimental version.
High availability: Built-in support for asynchronous, non-blocking, master/slave replication to ensure high availability of data. There is a high availability solution called Redis Sentinel that is currently available but is still considered a work in progress.
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