What is the difference between redis and memcached

The main difference between redis and memcached is: Redis is an open source in-memory data structure storage, used as a database, cache and message broker; Memcached is a free open source high-performance distributed memory object caching system, which reduces the database load by to speed up dynamic web applications.

Similarities between Redis and Memcached:

● Both Redis and Memcached are in-memory data stores system, both serve as in-memory key-value data stores.

●Both Redis and Memcached belong to the NoSQL series of data management solutions, and both are based on the key-value data model.

●　Both Redis and Memcached keep all data in RAM, which of course makes them very useful as caching layers.

【Video tutorial recommendation:Redis tutorial, Memcached tutorial】

The difference between Redis and Memcached :

1. Type

#Redis is an open source in-memory data structure storage system used as a database, cache and message broker.

Memcached is a free, open source, high-performance distributed memory object caching system that accelerates dynamic web applications by reducing database load.

2. Data structure

Redis supports strings, hashes, lists, sets, ordered sets, bitmaps, super logs and spatial indexes; while Memcached supports Strings and integers.

3. Execution speed

The read and write speed of Memcached is higher than that of Redis.

4. Replication

Memcached does not support replication. However, Redis supports master-slave replication, allowing slave Redis servers to become exact copies of the master server; data from any Redis server can be replicated to any number of slave servers.

5. Key length

The maximum key length of Redis is 2GB, while the maximum key length of Memcached is 250 bytes.

6. Threads

Redis is single-threaded; Memcached is multi-threaded.

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