Tag：Physics
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Time：2021-5-14
Pay close attention to “learning front end seriously” Join us to study together and make progress every day This article starts with WeChat official account. pixel resolving power What we usually call the display resolution is actually the resolution set on the desktop, not the physical resolution of the display. But now LCD has become […]
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Time：2021-5-13
Before following the steps in this document, you need to install docker Release of docker image Method 1: save the image to the tar package Syntax: docker save – O export image name. Tar local image name: image label [[email protected] docker-build]# docker save -o centos-httpd-docker-image.tar centos:httpd[[email protected] docker-build]# ll -htotal 275M-rw-r–r–. 1 root root 154 May […]
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Time：2021-5-12
Abstract:To achieve cross hard disk use, on the one layer above the traditional hard disk, cross EVs can be realized in the cloud server. In some scenarios, users need to create logical volumes or expand existing logical volumes, or in some cases, the above operations fail due to misoperation. Background description: To achieve cross hard […]
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Time：2021-4-21
fork Fork creates a child process. The original process is called the parent processA wonderful thing about fork() call is that it can only be called once, but it can return twice. It may have three different return values: When the process is a parent process, the PID of the child process is returned When […]
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Time：2021-4-3
Test2 new to fwq 1. Setting – XMS = – Xmx goes without saying 2. The initial heap memory allocated by the JVM is specified by – XMS, which is 1 / 64 of the physical memory by default; the maximum heap memory allocated by the JVM is specified by – Xmx, which is 1 […]
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Time：2021-4-2
introduction This article is the tenth,Virtual memory for storage managementBefore we knew about it, there was a question. A game has more than 10 gigabytes of physical memory and only 4 gigabytes of physical memory. How does the game work? In order to solve this problem, we need to introduce in this articlevirtual memoryKnowledge of […]
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Time：2021-2-21
This article demonstrates how to experiment with cloud control to switch between snapshot database and physical backup database. 1 switch from physical backup database to snapshot database 1) Switch to physical backup library orcldg 2) Click Convert in the standby database column 3) Click to continue 4) To confirm the conversion of the database, click […]
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Time：2020-12-5
This article is updated on May 3, 2020, using MySQL 5.7 and operating system deepin 15.4. catalog Logical backup and recovery Physical backup and recovery Cold backup and recovery Hot backup and recovery Table data import and export MySQL backup is divided into logical backup and physical backup, physical backup is divided into cold backup […]
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Time：2020-11-23
Introduction:Artificial intelligence (AI) and machine learning (ML) have caused a sensation in the physical security market, which has promoted video analysis to a new level of accuracy. In fact, these terms have become the common buzzwords of the whole industry. But the potential for AI and machine learning to impact the physical security industry goes […]
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Time：2020-11-20
Author: Mingcong Han In “ten minutes as a contributor series | adding optimization rules for cascades planner”, we briefly introduced the background knowledge of cascades. This paper will introduce the framework and principle of cascades planner, a new optimizer of tidb. Brief introduction of tidb current optimizer The function of query optimizer in relational database […]
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Time：2020-11-5
Abstract:What is cloud server? What services are there? Why do traditional enterprises start to choose cloud servers? What are its advantages? The traditional server is self built.You have to draw the drawings and give them to the builder to build the house for you. You have to worry about the land, water and electricity, decoration […]
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Time：2020-10-30
The significance of MMU [guide] this paper introduces the background and working mechanism of MMU from the perspective of memory management. However, the implementation details of the specific processor are ignored, and the working principle of MMU is clearly combed from the concept. Before the birth of MMU: In traditional batch processing systems such as […]
