Home Backend Development PHP Tutorial 数据迁移是什么意思?

数据迁移是什么意思?

Jun 13, 2016 am 11:18 AM
data migration

数据迁移是一种将离线存储与在线存储融合的技术;它将高速、高容量的非在线存储设备作为磁盘设备的下一级设备,然后将磁盘中常用的数据按指定的策略自动迁移到磁带库等二级大容量存储设备上。

数据迁移是什么意思?

数据迁移(又称分级存储管理,hierarchical storage management,hsm)是一种将离线存储与在线存储融合的技术。

它将高速、高容量的非在线存储设备作为磁盘设备的下一级设备,然后将磁盘中常用的 数据按指定的策略自动迁移到磁带库(简称带库)等二级大容量存储设备上。当需要使用这些数据时,分级存储系统会自动将这些数据从下一级存储设备调回到上一 级磁盘上。

对于用户来说,上述数据迁移操作完全是透明的,只是在访问磁盘的速度上略有怠慢,而在逻辑磁盘的容量上明显感觉大大提高了。

数据迁移是将很少使用或不用的文件移到辅助存储系统(如磁带或光盘)的存档过程。这些文件通常是需在未来任何时间可进行方便访问的图像文档或历史信息。

迁移工作与备份策略相结合,并且仍要求定期备份。还包括电脑数据迁移,迁移旧电脑(旧系统)中的数据、应用程序、个性化设置等到新电脑(新系统),在系统升级后很有必要。

数据迁移的实现可以分为3个阶段:

数据迁移前的准备、数据迁移的实施和数据迁移后的校验。由于数据迁移的特点,大量的工作都需要在准备阶段完成,充分而周到的准备工作是完成数据迁移的主要基础。

具体而言,要进行待迁移数据源的详细说明(包括数据的存储方式、数据量、数据的时间跨度);建立新旧系统数据库的数据字典;对旧系统的历史数据进行质量分析,新旧系统数据结构的差异分析;新旧系统代码数据的差异分析;建立新老系统数据库表的映射关系,对无法映射字段的处理方法;开发、部属ETL工具,编写数据转换的测试计划和校验程序;制定数据转换的应急措施。

其中,数据迁移的实施是实现数据迁移的3个阶段中最重要的环节。它要求制定数据转换的详细实施步骤流程;准备数据迁移环境;业务上的准备,结束未处理完的业务事项,或将其告一段落;对数据迁移涉及的技术都得到测试;最后实施数据迁移。

数据迁移后的校验是对迁移工作的检查,数据校验的结果是判断新系统能否正式启用的重要依据。可以通过质量检查工具或编写检查程序进行数据校验,通过试运行新系统的功能模块,特别是查询、报表功能,检查数据的准确性。

更多相关知识,请访问 PHP中文网!!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Easy to do! Data migration guide for new and old Huawei mobile phones Easy to do! Data migration guide for new and old Huawei mobile phones Mar 23, 2024 pm 01:54 PM

In today's society, mobile phones have become an indispensable part of people's lives, and with the rapid development of technology, mobile phone updates are becoming more and more frequent. When we buy a new Huawei mobile phone, one of the most vexing issues is how to smoothly migrate important data from the old phone to the new phone. As a leading domestic communications equipment manufacturer, Huawei's own data migration tools can solve this problem. This article will introduce in detail how to use the data migration tool officially provided by Huawei mobile phones to easily migrate old and new phones.

MySql data migration and synchronization: How to achieve MySQL data migration and synchronization between multiple servers MySql data migration and synchronization: How to achieve MySQL data migration and synchronization between multiple servers Jun 15, 2023 pm 07:48 PM

MySQL is a very popular open source relational database management system that is widely used in various web applications, enterprise systems, etc. In modern business application scenarios, most MySQL databases need to be deployed on multiple servers to provide higher availability and performance, which requires MySQL data migration and synchronization. This article will introduce how to implement MySQL data migration and synchronization between multiple servers. 1. MySQL data migration MySQL data migration refers to the data migration in the MySQL server.

Data Migration and Population with Laravel: Flexibly Manage Database Structure Data Migration and Population with Laravel: Flexibly Manage Database Structure Aug 26, 2023 am 09:28 AM

Using Laravel for data migration and filling: Flexible management of database structure Summary: Laravel is a very popular PHP framework that provides a convenient way to manage database structure, including data migration and data filling. In this article, we'll cover how to use Laravel's migrate and populate features to flexibly manage your database structure. 1. Data migration Data migration is a tool used to manage changes in database structure. It allows you to use PHP code to define and modify database tables, columns, indexes, constraints, etc.

Microservice data synchronization and data migration tool written in Java Microservice data synchronization and data migration tool written in Java Aug 09, 2023 pm 05:15 PM

Microservice data synchronization and data migration tools written in Java In today's Internet era, microservice architecture has become a widely used design pattern. In a microservices architecture, data synchronization and migration between services has become a critical task. In order to solve this problem, we can use Java to write a simple and powerful microservice data synchronization and data migration tool. In this article, I will detail how to write this tool in Java and provide some code examples. Preparation work First, we need to prepare some

Data migration library in PHP8.0: Phinx Data migration library in PHP8.0: Phinx May 14, 2023 am 10:40 AM

With the development of Internet technology and the continuous expansion of its application scope, data migration has become more and more common and important. Data migration refers to the process of moving existing database structures and data to a different environment or new system. The process of data migration can include from one database engine to another database engine, from one database version to another database version, different database instances, or from one server to another server. In the field of PHP development, Phinx is a widely used data migration library. Phinx support number

How to switch from PC to Mac and migrate data from Windows to macOS How to switch from PC to Mac and migrate data from Windows to macOS May 10, 2023 pm 04:28 PM

For people who are unfamiliar with Apple's operating system, macOS, moving from Windows to Mac can be a great but intimidating idea. Here's everything potential PC to Mac switchers should consider when making the platform jump. People switch platforms for many different reasons, from frustration with their existing environment to a need to move for work or simple curiosity. In some cases, the switch may be forced on unsuspecting users, such as if a family member gave them a Mac. Whatever your reasons for moving from Windows to Mac, the decision to do so is only the first step. Next, you must migrate your computing environment from Windows to a new and unfamiliar environment. it seems

How to quickly import old phone data to Huawei mobile phones? How to quickly import old phone data to Huawei mobile phones? Mar 23, 2024 pm 10:30 PM

How to quickly import old phone data to Huawei mobile phones? In today's information society, mobile phones have become an indispensable part of people's lives. With the development of technology and people's increasing demand for mobile phone functions, replacing mobile phones has become a common phenomenon. And when we upgrade to a new Huawei phone, how to quickly and effectively migrate the data from the old phone to the new phone becomes a problem that needs to be solved. For many users who use old mobile phones, they store a large number of contacts, text messages, photos, music, and videos.

How to transfer data from old computer to new computer How to transfer data from old computer to new computer Dec 27, 2023 am 09:11 AM

Many times we need to migrate some data when changing computers. If sometimes we have too much data, we can refer to the following methods to perform some simple data migration operations. How to transfer data from old computer to new computer in Windows 10. Method 1: Directly copy data 1. It is recommended to use direct copying to transfer data. 2. Use various external storage devices such as USB flash drives, mobile hard disks, memory cards or SD cards as media. 3. These devices can become your right-hand man to quickly complete data migration work with their convenient and practical features. Method 2: Migrate data with social tools 1. For example, QQ software, WeChat applications, email services and network cloud disk tools, etc. 2. These all have minimalist operation modes and convenient

See all articles