1.1 R What is edis
Redis is an open source, written in ANSI C, the high performance of Key-Value NoSQL database.
1.2 R & lt EDIS characteristics
(1) Based on Memory
(2) persistent data
(3) has a wealth of data structure types to meet the storage requirements of the non-relational data
(4) supports most popular development languages, such as C, C ++, Java, Python, R, JavaScript and so on.
(5) support the cluster model, efficient and stable.
1.3 Data Model (Key)
(1) in the form of key-value pairs.
Data structure types (2) of Redis, refers to the structure type Redis value.
|
1.4 Redis role
(1) is essentially a database capable of storing data.
Redis flexibility to deal with non-relational data reading and writing problems are in addition to MySQL and other relational databases.
Sina microblogging do is to use Redis cluster database.
(2) data cache.
The so-called cache, is to load data directly into the memory, but not always read from the disk by IO streams. Benefits: read and write high efficiency.
And sucked Redis data is stored directly in memory, only when there is insufficient memory space, the part of the data persisted to disk.