Programmer Think

Story backgroundWith the decline of hardware price, people rely more and more on hardware. I even heard that the code is not important. If not, add machines. For example, the use of cache is usually based on virtual machine memory, disk storage and Middleware (Redis memory). We all know that the most suitable is the best, but in practice, it is ...

preface Many friends may encounter a large amount of data, and your interface query is particularly slow. If so, there are many processing schemes, such as changing your serial query to parallel query, optimizing sql and indexing. Finally, there is no way to add cache. Because caching will cause the cached data to be different from the data in ...

Cache penetration problem? Cache penetration: it is specified to use some nonexistent key s for a large number of queries on Redis, resulting in failure to hit. Each request will be sent to the persistence layer for query, resulting in great pressure on the database. What are the solutions? Implement flow restriction on our service interface ...

1, Redis cache penetration, cache breakdown and cache avalanche solutions The conventional use of Redis as a solution will not be described here, but directly cut into the topic. How did Redis's cache penetration, cache breakdown and cache avalanche come from? How? If you don't have a preliminary understanding and use of Redis, you can re ...

Why do I need distributed locks User orders Lock uid to prevent repeated orders. Inventory deduction Lock inventory to prevent oversold. Balance deduction Lock the account to prevent concurrent operations. When sharing the same resource in a distributed system, distributed locks are often needed to ensure the consistency of ...

1. Introduction to NoSQL development 1.1 technology development NoSQL: mainly used to solve performance related problems. 1. Monomer Era However, with the rapid increase in the amount of data, the application server will have CPU and memory pressure, and the database service will have IO pressure. 2. Solve CPU and memory pressure ...

preface If you are asked what data structures redis has, you can certainly name five basic data structures: string, hash, list, set and Zset You may also know that it has three special data structure types: Geospatial, hyperlog and Bitmap. But if you ask what data structures you use in your actual project. Do you think most of them just us ...

Some students are so pissing. You can understand it. If you don't do it yourself, how can you understand it thoroughly? Let's do it together! Usage scenario and model selection The distributed multi node deployment mode makes it possible for shared variables to be operated at the same time. In case of data consistency requirements, global loc ...

1, Build environment Configure Maven.Spring boot integrates Redis.SpringBoot integrates Mybatis. The parent pom.xml file is as follows: <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven ...

This article is transferred from: Le byteThis article mainly explains: RedisFor more Java related information, you can pay attention to the official account number: 999Cache cacheCache conceptA cache is a replica set of original data stored on a computer for easy access.Common caching scenarios for Web projectsBuffer breakdownConcept:For some k ...