Programming VIP

1. Introduction of argparse module argparse is a python standard library used to process command line parameters. In most cases, scripts may need multiple parameters, and each parameter type has different uses. It is very useful to add labels before parameters to indicate the type and use of paramete ...

Preface: The company is facing restructuring with around 4 million data.The database design tables of the old and new systems have changed, and the relationships between tables have changed. Some even require a third-party interface to obtain data. Dependency: php7 laravel 5.5+ redis Migrati ...

Build a session sharing module based on spring session. Here, a redis-based cluster (Redis-5.0.3 version) is designed as a POM component, which is directly configured as dependency in the pom.xml file in order to meet the need of sharing sessions among the subsystems of the entire Internet of Things platform and facilitate the use of each subsy ...

1. Advantages of reducing redis memory usage 1. Help reduce the time required to create and load snapshots 2. Improving the efficiency of loading and rewriting AOF files 3. Shorten the time required to synchronize from the server 4. Allowing redis to store more data without adding additional hardware 2. Short structure Redis provides a se ...

Scheduler is a url scheduler in Webmagic. It collects URLs (target Requests of Page) that need to be crawled from Spider processing and poll s the URLs to be processed to Spider. Scheduler is also responsible for error retry and de-processing of url judgment, as well as statistics of total pages and remaining pages. Main interface: Scheduler d ...

Reprinted: http://www.cnblogs.com/ityouknow/p/5748830.html Besides the support of common database by spring boot, nosql database is also encapsulated and automated. Introduction to redis Redis is the most widely used memory data storage in the industry. Redis supports richer data structures than memcached, such as hashes, lists, se ...

Now that I've built a general project structure, I'm starting to write some necessary tool classes. Today I'll start with the redis application that I use.Redis has many applications in some projects, so I'm going to talk about spring's String RedisTemplate today.The function redis uses in this project is to cache some information about WeChat ...

Foreword: In actual development projects, an exposed interface often faces many requests. Let's explain the concept of idempotency: the impact of any multiple execution is the same as that of a single execution. According to this meaning, the ultimate meaning is that the impact on the database can only be one-time and can not be repeated. How t ...

Although Redis itself also provides redis-benchmark tools to test Redis's performance, in order to customize the test dimension freely, we still test it by writing our own scripts. Redis's official documentation also mentions that simply starting a loop and then sending operation commands to Redis in the loop is not a performance test for Red ...

Redis is an in-memory database that stores data in memory and is much faster to read and write than traditional databases that store data on disk.However, once the process exits, Redis's data will be lost. To solve this problem, Redis provides two persistence schemes, RDB and AOF, to save in-memory data to disk and avoid data loss. In Redis Per ...