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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 ...

Cache Basics At present, general CPU s have three levels of memory (L1, L2, L3), as shown in the figure below. Of which: L1 cache is divided into two types: instruction cache and data cache. L2 and L3 caches are independent of instructions and data.L1 and L2 are cached in each CPU core, and L3 is the memory shared by all CPU cores.The closer ...

Three notes @Cacheable can be marked on a method or a class. When marked on a method, it means that the method supports caching. When marked on a class, it means that all methods of the class support caching. For a method that supports caching, spring will cache its return value after it is called to ensure that the next time the method is ...

For the function of loading bean s, the calling methods in Spring are: MyTestBean bean = (MyTestBean)bf.getBean("myTestBean"); What function does this code realize? Let's see what's written in AbstractBeanFactory getBean public Object getBean(String name) throws BeansException { return doGetBean(name, null, null, false); } protected & ...

Mybatis user manual (4 of 5, continuously updated), collection + attention, don't get lost, hope to be helpful to my friends~ The source code link is at the end of the text ↓↓ 1. Mybatis deferred loading policy 1.1 introduction to delayed loading Mybatis deferred loading is to load data only when it is needed. When it is no ...

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 ...

If you want to use caching in WebApi, cache some result sets, which can reduce the pressure on the database server. The cache can be used according to the situation. Generally, it caches the data that is often queried and generally will not be updated. This article uses MemoryCache to cache data. Of course, there are many caching technologies, ...

        Redis supports a variety of data structures, such as string, list, set, ordered set and hash. This time I sorted out about   Hash   Related commands, that is, about   Hashes   The related commands are as follows.         The part in the red circle in the figure above is ...

Before we know about LRU, we should know about cache. We all know that the computer has cache memory and can temporarily store the most commonly used data. When the cache data exceeds a certain size, the system will recycle it to free up space to cache new data, but the cost of retrieving data from the system is relatively high. Cache requireme ...