Shulou(Shulou.com)06/03 Report--

[introduction]

REmote DIctionary Server (Redis) is a key-value storage system written by Salvatore Sanfilippo.

It is often called a data structure server because the value can be of types such as String, Hash, list, sets, and sorted sets.

[three characteristics of redis]

1. What are the characteristics of redis?

A:

① Redis supports data persistence. You can save the data in memory in the disk photo and load it again when you restart it.

② Redis not only supports simple key-value type data, but also provides storage of data structures such as list,set,zset,hash.

③ Redis supports data backup, that is, data backup in master-slave mode.

2. What are the advantages of redis?

A:

① performance is extremely high-Redis can read 110000 times per second and write 81000 times per second.

② rich data types-Redis supports Strings, Lists, Hashes, Sets and Ordered Sets data type operations for binary cases.

③ atom-all operations of Redis are atomic, meaning either successful execution or failure to execute at all. A single operation is atomic. Multiple operations also support transactions, that is, atomicity, wrapped by MULTI and EXEC instructions.

④ 's rich features-Redis also supports publish/subscribe, notification, key expiration, and so on.

[installation]

1. Windows installation is extremely simple

Run under the cmd window: redis-server.exe redis.windows.conf

2. Under Linux, run. / redis-server

Of course, this installation is the default configuration.

3. The difference between Redis and Memcached?

A:

① data types: redis provides five data types: string,hash,list,set and zset (sorted set); all values of Memcached are String. From this point of view, Redis is an extension of Memcached and an inclusion relationship.

② storage mode: all Memcached data is stored in memory, power outage will be lost, the storage capacity must not exceed the memory size; Redis has part of the data stored on the hard disk, which can ensure the persistence of the data. Thus it can be seen that Memcached compares low

Capacity of ③ single data: redis can reach 1GB at most, while memcache only has 1MB

④ underlying model: Redis builds its own VM mechanism directly.

4. The application scenario of Redis?

Answer: session cache (Session Cache), full page cache (FPC), message queue, ranking / counter, publish / subscribe.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.