How is redis different from memcached

1,memcached Single key Size is 1M, The new version is 2M.

2, Single redis Its size is 512M

3,memcached Is a multithreaded cache server , and redis Is a single threaded server

4,memcached Data cannot be persisted , Data will be lost after power failure

5,redis Make data persistent , Its use RDB The mechanism and AOF Mechanism for data persistence

6,memcached No clustering support , Its multi server situation is addServer When , Used by the client hash The way , Assign to the specified server ,

7,redis Support clusters , In the end 16 Databases ,memcached There is no concept of a library .

8,redis Support more data types , and memcached Only key value pairs key-value,

9,redis In use , It can also be used as a queue server . It also supports message subscription （ The chat room , Message push ）.

10,redis The internal implementation is the data dictionary .

11,redis Default port number 6379,memcached Default port number : 11211

Redis Supported data types

String ,  hash ,list ,set ,zset

Memcached Supported data types

String :key-value