Programmer Think

Purpose: Read cache to reduce server pressure and improve performance;Temporary data, such as validity verification code; 1,JSR107 (1) java caching defines five core interfaces Cache provider: create, configure, obtain, manage and control the cache manager. An application can access multiple cache providers at runtime;chchemanager: create, ...

strings String type is the most basic data type of redis. Other types are based on it. In short, the value of string type means string. We can store simple and complex types of strings (json, xml), numbers, binary files (pictures, audio, etc.). But not more than 512M. Common commands Set value set key value [ex] [px] [nx|xx] redis>set he ...

brief introduction The architecture with microservices does not represent good performance, but the architecture using microservices must require good performance. This sentence is not contradictory. The contradiction is that many people think that microservice architecture represents high concurrency, but it is not. We have the theory of &quo ...

catalogue 1, String data type 2, List data type 3, Hash data type (hash type) 4, Set data type (unordered set) 5, Sorted Set data type (zset, ordered set) 1, String data type Overview: string is the most basic type of redis, which can store up to 512MB of data. String type is binary safe, that is, it can store any data, such as numbers, ...

For single process implementation @RequestMapping("/miaosha1") @ResponseBody public String miaosha1() { synchronized (this){ Map<String,Object> mapListmaps = new HashMap<>(); //Get inventory value in redis int kucun = Integer.valueOf(redisUtil.getStrKV("kucun").toString()) ...

Database Introduction concept A Database for storing data, which organizes, stores and manages data according to a certain data structure. classification Relational databases: mysql, sql server, oracle, DB2, etc. Non-relational databases: redis, etc. How python operates on databases pymysql: pure Python development, supporting python2 and ...

Catch all Redis Lua script concurrent atomic combination operations 1. Preface Redis is a high-performance KV in memory database. In addition to its basic role as a caching middleware, it also has many uses, such as what Pangge shared before Redis GEO geographic location information calculation . Redis provides a wealth of commands for us to ...

1. Install redis for Ubuntu / CentOS (redis5.0.8 does not need to update gcc) https://blog.csdn.net/qq_34246965/article/details/115269542 2. Start redis service and verify If it is in the bin directory under the redis file, the command: redis-server /etc/redis/redis.conf # start redis service If it is in the redis file /bin/redis-server /et ...

Redis distributed Session Spring-Session Spring seesion solves the problem of sharing distributed session s. introduce Spring Session is one of the projects of spring. GitHub address: https://github.com/spring-pro. Spring Session provides a perfect solution for creating and managing servlet httpsessions. function spring Se ...

redis pipeline Beer theory, for example, there are 24 bottles of beer in the store. You can't take one bottle home and drink another. You need to find a box to carry the beer home together The buffer mechanism can also be understood in this way to avoid calling back and forth A request / response server can handle new requests even ...