Programming VIP

1, Baidu Encyclopedia Redis is a key value storage system. Similar to memcached, it supports relatively more stored value types, including string (string), list (linked list), set (set), zset(sorted set -- ordered set) and hash (hash type). These data types support push/pop, add/remove, intersection, union, difference and richer operations ...

1, Three ways of weight removal 1.HashSet Use the features of HashSet in java that cannot be repeated to remove duplicates. The advantage is easy to understand. Easy to use. Disadvantages: large memory consumption and low performance. 2.Redis de duplication Use Redis's set for de duplication. The advantage is that it is fast (Redis itself is ...

catalogue Fundamentals: distributed locks Why do I need distributed locks? Characteristics of distributed locks Common scenarios Redis implements distributed locks Redisson distributed lock entry practice reference Fundamentals: distributed locks The synchronized keyword and ReentrantLock reentrant lock in Java can control concurrent ...

Crazy God video address https://www.bilibili.com/video/BV1S54y1R7SB 1,NoSQL 1.1 why use Nosql Have some chicken soup first We are now in 2020, in the era of big data;The general database of big data cannot be analyzed!Force yourself to study! Only continuous learning! This is the only law to survive in this society!Study or for yo ...

Redis OM Redis OM is an Object Mapping framework officially launched by redis, that is, Object Mapping. It allows developers to operate redis data more simply and conveniently. The data stored in redis is abstracted as Object Mapping and supports object-based redis data persistence and streaming query operations. Currently, only four developm ...

​ 1. What is a sentry Sentry monitors the operation of Redis system. It is an independent process with two functions: Monitor whether the master database and slave database are running normally;After the master data fails, it will automatically convert the slave database to the master database; 2. Principle Structure of a single sentry: ​ Ar ...

redis string operation 1.redis string type String string type, commonly used for plain text List list type, which is often used in a warehouse to delete a data after it is taken away hash type, which is commonly used to import mysql data into redis Set set type, which is used to compare different sets 2. Common redis instructions Keys ...

In the evening, I went to a Honda car club, the civic of Yishui. Although I'm not the owner of Honda, I like cars very much, so I would go to join in the fun. The civic red in the hatchback is really handsome. Hahaha, I didn't get home until nearly ten o'clock in the evening. It's twelve o'clock after writing this article. Well, no more nonsens ...

background The day before yesterday, my colleague reported that there was a problem with the redis distributed lock, resulting in duplicate order numbers. Later, everything was normal after it was replaced with reission. Based on this phenomenon, this paper analyzes it Problem driven The following code is analyzed and three problems are foun ...

Hello, ladies and gentlemen. Today I share another practical article with you. I hope you can like it. Appetizer Recently, I received a new demand to upload about 2G video files. I tried it with the OSS of the test environment. It takes more than ten minutes to upload. Considering the company's resources, I resolutely gave up the scheme. Whe ...