Tag：data
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Time：2021-5-9
Introduction:Observability, as one of the core links of technology system, follows the rapid development of EMM technology and makes continuous self innovation. preface Back in 2008, Zhang xuhao, Kang Jia and others, who were still studying in Shanghai Jiaotong University, founded “hungry Yao” in Shanghai. Starting from the campus takeout scene, hungry Yao has grown […]
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Time：2021-5-9
By Travis Tang (Voon Hao)Compile VKSource: towards Data Science At this point, anyone thinks that the potential of machine learning in the field of medicine is commonplace. There are too many examples to support this view – one of them is that Microsoft uses medical imaging data to help clinicians and radiologists make accurate cancer […]
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Time：2021-5-9
1、 Introduction of storage failure The storage device of a vsan distributed file system of a company in Beijing was shut down and restarted for unknown reasons, and then it was found that the logical architecture had a serious failure, the upper virtual machine was paralyzed, and the data in the storage was lost.The customer’s […]
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Time：2021-5-9
preface When it comes to database transactions, it’s easy for you to have a lot of knowledge about transactions in your mind, such as the acid characteristics of transactions, isolation levels, problems solved (dirty read, non repeatable read, magic read), etc. but few people really know how these characteristics of transactions are realized, and why […]
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Time：2021-5-9
Redis Cluster Before learning redis cluster, let’s first understand why we need cluster. When we encounter single machine memory, concurrency, traffic and other bottlenecks, the single machine can no longer meet the requirements of our node 7000 and 7001, we can use cluster architecture to achieve load balancing. Introduction to data partition The distributed database […]
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Time：2021-5-9
Both watch and computed are based on Vue’s dependency tracking mechanism. They both try to deal with such a thing: when a certain data (called dependent data) changes, all the “related” data that depends on the data “automatically” changes, that is, they automatically call the related functions to realize the data change.The difference between them […]
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Time：2021-5-9
The purpose of neural network is to find suitable parameters to make the value of loss function as small as possible. The process of solving this problem is called optimization. The algorithm used to solve this problem is called the optimizer. 1、 BGD、SGD、MSGD Bgd: the most primitive gradient descent algorithm, which calculates the loss of […]
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Time：2021-5-9
introduce Technology stack: koa2 + mongodb Function point: get client IP and address; Statistics of user visits; And collect browser related information. Objective: to achieve few functions, mainly to build up the project infrastructure to facilitate subsequent expansion. Project address:https://github.com/Jervis2049… directory structure Θ – app.js // entry file View // EJS template Static // static […]
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Time：2021-5-9
1、 What is data segmentation It refers to that we store the data in the same database separately under certain conditionsPut it on multiple databases (hosts) to disperse the load of a single device. There are two kinds of data segmentationvertical partitioning andhorizontal partitioning 。 2、 Vertical segmentation According to the application function module to […]
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Time：2021-5-8
MongoDB Create database -Format: Use Database_ NAME – use ruochen – db Creating a database requires inserting a piece of data to be displayed in the list -DB. Ruochen. Insert ({name ‘:’ruochen’}) – show dbs Delete database Format: db.dropdatabase () use ruochen db.dropDatabase() show dbs Create collection -Format: db.createcollection (name, options) -Name: the name of […]
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Time：2021-5-8
background If you need to regularly clean up the historical data in an ordinary large table. You can use one or more delete statements with a where condition (where condition is time). If the amount of table data is large, it will cause great pressure on the database. Even if we delete the old data, […]
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Time：2021-5-8
1、 Preface With the development of technology and market demand, real-time development has become an indispensable part of the current big data development. In the whole real-time development link, data acquisition needs to be written to Kafka, and data processing also needs to use Kafka. Today, we will give a brief introduction to Kafka, the […]
