Programmer Think

Business scenario The document number format generated by handling business in different regions must be: current month and year + 5 digits, and the number increases from 00001. The initial solution is to generate self increasing sequences, but because there are too many regions to complete a sequence in each region, this scheme will not w ...

Redis overview What is Redis Redis (Remote Dictionary Server), that is, remote dictionary service, is an open source log type and key value database written in ANSI C language, supporting network, memory based and persistent, and provides API s in multiple languages. Redis has largely compensated for its emergence memcached This kind of ...

1: Overview of Redis persistence Persistence function: Redis is an in memory database, and all data are stored in memory. In order to avoid permanent loss of data caused by process exit, it is necessary to regularly save the data in Redis from memory to hard disk in some form (data or command); When Redis restarts next time, use persistent fil ...

Spring boot + redis realizes the record of article views Previously, the article visits in personal blog websites were stored in MySQL. Every time you visit, you need to check the database through the article id and operate + 1 after obtaining the number of views. After updating the database, in order to display the article views in real time, ...

Project scenario: As I know, the project we are working on now has many external interfaces for the agent to call, but the response of some interfaces is not returned in real time. At this time, we need to respond to the agent by calling back the interface. During this period, other situations such as network instability may occur, resulting i ...

1, List Common API Underlying implementation List is an ordered data structure (sorted according to the added sequence). Redis uses quicklist (double ended linked list) and ziplist as the bottom implementation of list. You can improve data access efficiency by setting the maximum capacity of each ziplost and the data compression range of ...

1. jedis class 1. First, we need to import the jedis package Latest jedis After that, we put it into the directory at the same level as src, and then right-click the item to find: Next, let's test. At the beginning, I encountered such a problem The reason is that I didn't open the server, so you must remember to open the server. Now let ...

Principle: first, call login, and a token will be passed to the front end. Later interfaces need to use this token. The front end needs to put the token into the request header and pass it when calling the interface. After the back end obtains the token, compare the obtained token with that in the database. If it is the same, it means that it h ...

typora-root-url: D:\software\dev\Typora\locales Installing Redis under Linux 1. Download the installation package! redis-6.2.4.tar.gz $ cd /home/wlk $ wget http://download.redis.io/releases/redis-6.0.6.tar.gz 2. Unzip the installation package to / opt, and you can see redis Conf file $ tar xzf redis-6.0.6.tar.gz -C /opt $ cd redis-6.0.6 ...

1, First, consider a question: why does redis need a distributed solution with such high performance? 1. Achieve higher performance: for highly concurrent applications, the performance of a single machine will be affected. More redis servers are needed to share the pressure and achieve load balancing 2. Achieve high availability: prevent down ...