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Build an instance based on memcache: web(php) host: 192.168.181.6 redis host: 192.168.181.5 mysql host: 192.168.181.4 First, close the firewall of the three hosts systemctl stop firewalld systemctl disable firewalld sed -i 's/enforcing/disabled/'/etc/selinux/config setenforce 0 Synchronization time yum -y install ntp ntpdate ntpdat ...

Introduction: MongoDB is a very promising database, and MongoDB officially locates itself as a generic database, which is somewhat like MySQL. Although its popularity is far from the level of MySQL, there is one possible inappropriate comparison. Like MySQL N years ago, MongoDB will become stronger and more popular over time. Due to the comple ...

In the development and testing environment, we usually build a single instance of Redis to meet the development and testing requirements. However, in the production environment, if there are high requirements for availability and reliability, we need to introduce Redis cluster scheme. Although major cloud platforms now provide caching services ...

summary Redis sharding cluster is to cope with the data growth brought by business growth and realize online dynamic horizontal expansion and contraction. Each sharding master node in the cluster processes a subset of 16384 hash slots; In order to stabilize high availability deployment, enable one or more replica nodes for each partition node; ...

catalogue RedisTemplate switch Jedis implementation Switch the underlying Jedis API operation Redis RedisTemplate switch Jedis implementation 1. Spring Boot is Lettuce and Jedis The client library provides basic automatic configuration. By default, it is used Lettuce As a client, if you want to switch the Jedis client, there are two steps: ...

The article is reprinted, convenient for sorting and induction, and the source address https://juejin.cn/post/6989526481709826055 Memory fragmentation rate formula mem_fragmentation_ratio = used_memory_rss/used_memory used_memory: the size of the memory space allocated by the Redis service's own allocator.used_memory_rss: the memory size ...

Past and present life of Redis thread model https://mp.weixin.qq.com/s/MwG9GpnTVbma69PiOHHvgw Past and present life of Redis thread model original   Wang Shaodong   vivo Internet technology   2021-11-24 17 contents included in the topic # database Author: vivo Internet server team - Wang Shaodong   1, Overview   As we all know, ...

The essence of optimization The purpose of source code optimization of marriage and love system is to ensure the robustness of the program. Sometimes it is not necessary to spend too much time when the program can run normally. Cyclic optimization Take an example, please pay attention to this code, the source code of marriage and marriage sy ...

1, Background introduction There are many split services in the distributed system. In the process of continuous iterative upgrading, the following common thorny situations will occur: For the version upgrade of a technical component, depending on the package upgrade leads to the expiration of some syntax or API, or the component fixes urgent ...

Learning reference Videos: [crazy God says Java] Redis Redis 1, Overview of redis redis is a non relational database. 1. Introduction to non relational database A non relational database, that is, NoSQL (Not Only SQL). Relational database: column + row. The data structure under the same table is the same. Non relational database: data ...