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This article mainly explains "what are the characteristics of Redis". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what are the characteristics of Redis.

Redis introduction

Redis is a popular NoSQL (Not Only SQL) database at present. NoSQL plays an important role in the Internet system, because it can greatly improve the performance of the Internet system.

Redis has the function of a certain persistence layer and can also be used as a caching tool. For NoSQL database, as a persistence layer, the data it stores is semi-structured, which means that computers have fewer rules to read into memory and read faster.

It performs better for most database systems with structured, multi-paradigm rules. As a cache, it can support big data to store in memory. As long as the hit rate is high, it can respond quickly, because the data read / write in memory is tens to hundreds of times faster than the database read / write disk, as shown below:

For NoSQL, some people think that it can replace the database, but for the real database, NoSQL has a loose structure, incomplete structure and limited function, and it does not have the strength to replace the database, but as a cache tool, its high performance, high response and other functions make it a very important tool.

The reason why Redis has become the main tool of NoSQL (1) Fast response

Redis responds very quickly, performing about 110,000 writes per second, or 81000 reads per second, much faster than the database. If you store some commonly used data, you can effectively improve the performance of the system.

(2) 6 data types are supported

They are strings, hash structures, lists, collections, sortable sets, and cardinality. For example, strings can be stored in some Java basic data types, hashes can store objects, lists can store List objects, and so on. This makes it easy to choose the data type to be stored according to your own needs in the application, which is convenient for development.

For Redis, although there are only six data types, there are two major advantages: on the one hand, it can meet the needs of storing various data structures; on the other hand, fewer data types make fewer rules and less judgment and logic, so that the speed of reading / writing is faster.

(3) the operations are all atomic.

All Redis operations are atomic, ensuring that when two customers access the Redis server at the same time, they get the updated value (the latest value). When you need high concurrency, you can consider using Redis transactions to handle some business that needs to be locked.

(4) MultiUtility tool

Redis can be used in caching, messaging queues (Redis supports publish + subscribe message mode), and in any short-lived data such as Web application sessions, website page clicks, and so on.

It is precisely because of these advantages that Redis has become the mainstream NoSQL technology and has been widely used in the Java Internet.

On the one hand, using NoSQL to read data from a database for caching, you can read data from memory instead of reading disk like a database. The reality is that read operations are much more than write operations, so caching a lot of commonly used data, improving its hit rate will help to improve the overall performance, and can reduce the pressure on the database, which is very beneficial to the Internet system architecture.

On the other hand, it can also meet the Internet high concurrency needs high-speed data processing occasions, such as snatching red packets, commodity seconds and other scenarios, these occasions need high-speed processing, and ensure the security and consistency of concurrent data.

At this point, I believe you have a deeper understanding of "what are the characteristics of Redis?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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