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This article mainly shows you "what are the basics of Redis", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "what are the basics of Redis" this article.

Basic knowledge of Redis

1. Redis is a single process

A single-process model to handle client requests. The response to read and write time is achieved by wrapping the epoll function. The actual processing speed of Redis depends entirely on the execution efficiency of the main process.

Epoll is an improved epoll made by the Linux kernel to deal with a large number of file descriptors. It is an enhanced version of the multiplexed IO interface select/poll under Linux. It can significantly improve the system CPU utilization in a large number of concurrent connections with only a small amount of activity.

two。 Performance testing tool

/ usr/local/bin/redis-banchmark

3. Default 16 databases can be set

There are 16 databases by default, similar to the following table in the array, starting from zero, and initially using the zero library by default.

Find setting in redis.conf: database 16

4. Select switch database

127.0.0.1 9736 > select 1OK127.0.0.1:9736 [1] >

5. DBSIZE to view the number of key in the current library

127.0.0.1 9736 [1] > DBSIZE (integer) 0127.0.1 VR 9736 [1] >

6. Find all keys

127.0.0.1 keys 9736 [1] >

1) "K3"

2) "K2"

3) "K1"

127.0.0.1purl 9736 [1] >

7. Support? , * Fuzzy search

127.0.0.1 KEYS 9736 [1] > KEYS K444) "K3" 2) "K2" 3) "K1" 127.0.0.1 9736 [1] > K444 "

8. FLUSHDB empties the current library

9. FLUSHALL clears all libraries

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