Tag：data
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Time：2020-4-6
Since 2012, almost everyone (at least in the Internet world) has said big data. It seems that they are embarrassed to chat with others without touching big data. Since 2016, the big data system has gradually entered the deployment stage in the enterprise, and the hype of big data has gradually dissipated, followed by the […]
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Time：2020-4-6
The way of the evolution of large websites__ Author: Yao Maomao’s blog & Yaosheng What are the characteristics of large-scale website or software? With high concurrency and large traffic, wechat has a daily life of 1 billion7 × 24 high availability, commonly known as 4 9 (99.99%)Storage and management of massive dataUser distribution and complex […]
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Time：2020-4-6
Recently, the data science team of Netflix Netflix, an American video streaming platform and video publishing company, announced the official open source of its Python library metaflow to help more data scientists and engineers build and manage relevant data science projects. Metaflow is a “humanized” data science framework developed by Netflix, and also an important […]
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Time：2020-4-6
Finding anomalies At 10:00 a.m. on November 18, 2019, I randomly tested the app and found that I could not log in. It’s strange, because this user can’t exist. Then, I connected to the database and found an amazing scene. One more in mongodb, I don’t knowRECOVERAYDatabases, and other related application databases, are all gone. […]
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Time：2020-4-6
Original translation, if you need to reprint, please contact the translator.My Jane Book blog: nummy Implementing a restful web API with Python & flask brief introduction First, install flask pip install flask Before reading this article, I assume you have understood the relevant concepts of restful API. If you are not clear, you can read […]
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Time：2020-4-6
Hou Jinlong, President of Huawei cloud & AI products and services, announced at the 2019 global data infrastructure forum held last week that his data virtualization engine hetuengine will be open-source to help more users reduce the difficulty of data management and simplify the process of data use. Hetuengine can reduce the complexity of data […]
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Time：2020-4-6
As we all know, computers are the devices for processing data, and the main storage location of data isdiskandMemory, and for programmers, CPU and memory are two physical structures that we must understand. They are very important bridges for you to go to high-level programmers. In this article, we will introduce the basic memory knowledge. […]
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Time：2020-4-6
What is cookie Cookie(also calledWeb CookieOr browserCookie）It is a small piece of data sent by the server to the user’s browser and saved locally. It will be carried and sent to the server the next time the browser makes a request to the same server. Usually, it is used to tell the server whether two […]
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Time：2020-4-6
Ckafka helps Tencent classroom to realize stable interaction of millions of messages Introduction: during the epidemic period, in order to ensure the normal learning progress of domestic students, Tencent classroom actively responded to the call of the state to “stop work and keep learning”, and launched a special “teacher’s fast version” during the epidemic period […]
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Time：2020-4-6
In a recent project, it is required to perform persistent processing on Redux data. After research, it is successfully implemented. Here is a record of the process We can useredux-persistPersistent data processing install npm i –save redux-persist Use After the installation is successful, we need tostoreThe code is modified. This is my store generation file […]
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Time：2020-4-5
findOneAndUpdate() Model.findOneAndUpdate(filter, update[, options][, callback]) Parameter 1: filter The query statement is the same as find() filterby{}, update the first data Parameter 2: update {operator: { field: value, … }, … } Must useupdateOperator If there is no operator or the operator is notupdateOperators, unified as$setOperation (unique to mongoose) Update operator Field related operators Symbol […]
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Time：2020-4-5
Original link: HTTPS: / / dsx2016. COM /? P = 679WeChat official account: Senior brother 2016 Features and differences vueOfcomputedOption is mainly used to synchronize data processing, whilewatchOption is mainly used for event dispatch, asynchronous Both of them can achieve the same effect, but based on their respective characteristics, there will be some differences in […]
