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"a""b" 127.0.0.1:6379> lset list1 0 v OK 127.0.0.1:6379> lrange list1 0 -1"v""b" - lrm : Delete an element and return the number of deleted elements ```java 127.0.0.1:6379> lrange list1 0 -1 1) "b" 2) "b" 3) "a" 4) "b" 127.0.0.1:6379> lrange list1 0 -1 1) "a" 2) "b" lindex: returns the element at the specified position in ...

1,geospatial It mainly specifies the geospatial location (latitude, longitude and name), which can calculate the information of geographical location, the distance between the two places, the people within a few miles, etc! City longitude and latitude query address: http://www.jsons.cn/lngcode/ Official document address: https://www ...

1, Introduction to LRU algorithm The full name of LRU algorithm is Least Recently Used, that is, check the Least Recently Used data. It is usually used in the memory elimination strategy to move infrequently used data out of memory to make room for "hot data" or new data. In essence, the algorithm is very simple. It only needs to so ...

Introduction to NoSQL database technological development Classification of Technology Solve functional problems: Java, Jsp, RDBMS, Tomcat, HTML, Linux, JDBC, SVNSolve the problem of Extensibility: Struts, Spring, Spring MVC, Hibernate, MybatisSolve performance problems: NoSQL, Java thread, Hadoop, Nginx, MQ, ElasticSearch NoSQL database N ...

Everyone has heard of the 10000 hour law, but is this really the case? After 10000 hours of CRUD, don't you only know CRUD? These days, you don't properly update your own technology stack. When you go out to chat and boast with others, you don't lose it (⊙ o ⊙) Interview topics What is distributed lock? First, in order to ensure the availabi ...

1, Spring boot introduces redis dependency Spring boot supports redis very well, just in POM XML file <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> Go to spring boot starter data redis. At the bottom, you can see that ...

Redis download and installation (Linux download) 1. Environmental preparation Virtual machine version: VMware ® Workstation 16 ProLinux system: Centos7Remote command side: xshellFile transfer tool: SecureFXPortable 2.Redis installation 2.1 Redis compilation language Redis is developed in C language. To install redis, you need to downl ...

Introduction to Spring data redis Spring data redis is a part of the spring family. It provides access to redis services through simple configuration in srping applications, and highly encapsulates the underlying development packages of reids (Jedis, JRedis, and RJC) About key 1. Delete a single key //Delete key public void delete(Strin ...

1. Component dependency First of all, we will introduce Jedis open source components through Maven, which can be found in POM. Com Add the following code to the XML file: <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </depe ...

Persistence Redis is an in memory database. It needs to be persistent in case of power failure and power loss. RDB is used by default. Generally, we can use it without modifying RDB configuration. RDB (Redis DataBase) What is RDB Redis will create a fork subprocess separately for persistence. In the subprocess, it will cycle all data and wr ...