redundant pdu

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Three scenarios for MySQL redundant data

One, why redundant dataInternet data volume of business scenarios, often the database needs to be horizontal segmentation to reduce the amount of single-Library data.The horizontal cutting branch has a patition key, the query with Patition key can be directly located to the library, but the query on the non-patition key may need to scan multiple libraries.The common architecture design is to use the inverse paradigm design of data redundancy to meet t

Resolve redundant raid Disk Arrays

Resolve redundant raid Disk Arrays Preface In the past, computer systems were often limited to writing information to a single disk. This type of disk is usually expensive and prone to failures. Hard disks have always been the most vulnerable part in computer systems, because these devices are the only mechanical part in systems where other components are completely electronic. The disk drive contains many high-speed active mechanical parts. The probl

mysql-Redundant and duplicate indexes

MySQL allows multiple indexes to be created on the same column, either intentionally or unintentionally, andMySQL needs to maintain duplicate indexes separately, and the optimizer needs to consider each one individually when optimizing queries, which can affect performance. Duplicate indexes are indexes of the same type that are created in the same order on the same column, and should be avoided by creating duplicate indexes and discovering that they should be deleted in the future. However, it

InnoDB row Format (compact,redundant) comparison

Tags: style io ar using for SP file Data divInnoDB row format in two formats (compact,redundant) The storage format of the compact Compact is a non-null, variable-length list of field lengths, and is placed in reverse order by column, when the length of the column is less than 255 bytes, denoted by 1 bytes , if it is greater than 255 bytes. In 2 bytes, the maximum varchar length is 65535gt, since two bytes are 16 bits, 65535, and the second part is th

"My Linux, I am the master!" Redundant array of independent disks raid classification and implementation method

redundant Arrays of inexpensive Disks (RAID)", since the concept of a redundant array of inexpensive disks was generated, However, in the actual application of the enterprise found this technology still need to spend a lot of money to support, so renamed redundant Arrays of independent disks that redundant array of in

The role of redundant fields in database performance optimization

What is a redundant field. When designing a database, a field belongs to a table, but it appears in one or more tables at the same time, and is exactly the same as the meaning of the table it belongs to, then the field is a redundant field. --These are the definitions I gave myself. Whether the existence of redundant fields is good or bad. This is a difficult qu

When Rsync synchronizes, delete the destination directory than the source directory redundant file method (--delete)

In daily operations, we often use rsync as a synchronization artifact. Sometimes when synchronizing two directories, it is required to delete files in the target directory that are more than the source directory, in which case the--delete parameter of rsync can be used to implement this requirement.Like what:Synchronize the/tmp/work directory on Server A to the/tmp/work directory of Remote Server B (A and B have already done the SSH no password trust jump relationship in advance), and delete the

WordPress Redundant file Optimization plugin: wp clean up and WP Cleaner

Today, we have a personal site has been quite easy, the program does not need us to write out, directly to find a free open source WordPress program, as well as a lot of free and beautiful WordPress theme and functional plug-ins can basically have their own site minutes. However, if we have used the WordPress program will certainly find that after running for some time will find that the speed is not as good as the beginning, and more and more slowly, we know all suspected is the host business p

Unlocking the mystery of redundant routing automatic switching in Broadband Access Networks

Broadband Access Network is a commonly used access method. At the same time, we may encounter many problems, such as the failure to automatically switch redundant routes. Many people may not understand the causes and solutions of such problems, it doesn't matter. After reading this article, you will certainly have a lot of GAINS. I hope this article will teach you more things. A broadband access network server is installed at a node in the convergence

Serialization | Iot framework ServerSuperIO tutorial-9. protocol filter, which solves multiple packets, sticks to packets, and redundant data. What does redundancy mean?

Serialization | Iot framework ServerSuperIO tutorial-9. protocol filter, which solves multiple packets, sticks to packets, and redundant data. What does redundancy mean? 1. C # Introduction to cross-platform Iot communication framework ServerSuperIO (SSIO) Serialization | Iot framework ServerSuperIO tutorial 1.4 communication modes and mechanisms. Serialization | Iot framework ServerSuperIO tutorial 2. service instance configuration parameters Seriali

Query performance testing of views and redundant physical tables

': #init_all () The advantage of the redundant table is that the query, and the disadvantage is to delete and change [need transactions, while the need to write two copies] "" The advantage of the view is to delete and change only need to change the original physical table, and the disadvantage is that the query "" "so the following test is redundant table of the long Duel view of the short '" " , I ind

Do you think the asmx file in. Net Web Service is redundant?

Generally, A. asmx file is added first when WebService is developed using. Net, and then WebService is constructed by marking WebService and WebMethod in its. cs file. Have you ever wondered whether the. asmx file is redundant .? In fact, asmx is not used as a UI like aspx, nor is it used to process business logic like A. handler file. Its existence is redundant. Using Spring. Net to build a WebService comp

Remove redundant code after Word table goes to HTML

Word can be saved as HTML file, through this function, can quickly realize the Web page to display Word content, especially the form of editing, it contains TR, TD, Th, rowspan, colspan and other content, direct write more cumbersome.But word converted HTML By default is with a lot of format code, then how to remove these redundant code, only the main content?Originally intended to find tools from the Internet, but found that there is no ready-made, i

Remove redundant add-ons from the Win7 system thoroughly

In the concept of Windows system optimization, removing redundant add-ons is an important optimization tool, and in many third-party tools have such an optimization method, we in the normal optimization methods, but also most of the use of Third-party software, such as 360 security guards, and so on, directly prohibit the third party add-in in the boot, But do you know, such a prohibition method can only start automatically to prohibit the software, b

Remove Eth0.bak and redundant network cards from Linux systems __linux

Remove Eth0.bak and redundant network adapters from Linux systems Deleting redundant ifcfg-eth0.bak in a VM CentOS a Eth0.bak configuration backup file appears after the system changes the NIC or Nic MAC address Workaround: /etc/sysconfig/networking/devices directory, delete Ifcfg-eth0.bak /etc/sysconfig/networking/profiles/default, remove Ifcfg-eth0.bak /etc/sysconfig/network-scripts/, remove Ifcfg-et

Windows Azure Storage (+) Azure Storage Read access Geo redundancy (read Access–geo redundant Storage, Ra-grs)

Windows Azure Platform Family of articles Catalog  Careful users will find that Microsoft is paired with data center construction both abroad and domestically, such as the Hong Kong Data Centre (Asia East) and the Singapore Data Centre (South East Asia). This is because Microsoft fully considers the ability of geo-redundancy. Between the two data centers, such as Hong Kong and Singapore, there will be a dedicated line connection, which is used for data synchronization before the intranet data ce

MySQL duplicate index, redundant index, definition and lookup of unused indexes

Label: 1. Redundant and duplicate indexes MySQL allows multiple indexes to be created on the same column, either intentionally or unintentionally, andMySQL needs to maintain duplicate indexes separately, and the optimizer needs to consider each one individually when optimizing queries, which can affect performance. Duplicate indexes are indexes of the same type that are created in the same order on the same column, and should be avoided so that they s

Project network redundant, Vmware virtualization, Dell VRTX P2v-part 2 (VRTX network)

The above section analyzes most of the structure of enterprise content:http://zhangfang526.blog.51cto.com/8588740/1772382So what can we do with a switch or Dell VRTX?First look at the following diagram:650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/7F/FC/wKiom1czMp-CvgLXAADWjvhYZU4559.png "title=" 4.png " alt= "Wkiom1czmp-cvglxaadwjvhyzu4559.png"/>FirstTo separate the data network from the management networkSecondDELL VRTX has 8 external ports (in SW mode), then we use four lines as

Redundant code goes away--front-end Module packaging tool Rollup.js Getting Started

Previously translated an article, introduced by the ES2015 the Deconstruction assignment syntax introduces the module, can let the packing tool (browserify) finally compiles the code quantity to minimize.But in the Webpack 1.X version is unable to use this feature to avoid the introduction of redundant module code, resulting in the bundle file size is inevitably slightly bloated.Today you will be introduced to a popular fried chicken--rollup.js, throu

Remove Word redundant format Java regular expression

When Word transforms HTML, it leaves a lot of formatting, some formatting is not what we need, however, these formats are more than the actual content of the article, seriously affect the loading speed of the page, so you need to find a good solution to the redundant format to remove. There are many regular expressions on the web that remove the JS version of Word redundancy, only the Java version of the regular expression is available here.1.public s

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