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Advanced Techniques for optimizing data warehouses Using Dimension objects

ExploitationDimensionAdvanced Techniques for optimizing Data Warehouses Author:Anysql.netDuring reprinting, be sure to mark the original source and author information in the form of hyperlinks.Link:Http://www.anysql.net/Oracle/Oracle_Olap_dimension.html InOracleIn the data warehouse (OLAP), the materialized view (mview), query rewrite (query rewrite) andDimension(Dimension) is a very important optimization method. I don't want to repeat

System Dimension and level

If the system is regarded as a multi-dimensional object, the UML class diagram, sequence diagram, state diagram, and use case diagram are the views created for the system in different dimensions. In addition to the differences between dimensions, this view also has different levels (granularity) under the same dimension. For example, package digoal is a view with a higher level (coarse granularity) than class digoal. The system is multidimensional and

ML: Descending dimension algorithm-PCA

PCA (Principal Component analysis) is also known as the Karhunin-low transformation (Karhunen-loeve Transform), a technique used to explore high-dimensional data structures. PCA is often used for exploration and visualization of high-dimensional datasets. can also be used for data compression, data preprocessing and so on. PCA can synthesize high-dimensional variables that may have correlations as linear independent low-dimensional variables called principal components (principal component). The

PCA method in descending dimension algorithm

1 Principal component Analysis(Principal Component ANALYSIS,PCA)2 linear discriminant Analysis(Linear discriminant analysis, LDA)Research backgroundIntroduction to basic knowledgeIntroduction to the Classic methodSummary discussionThe question is raisedGeographic systems are complex systems with multiple elements. In the study of geography, multivariate problems are often encountered. Too many variables will undoubtedly increase the difficulty and complexity of the analysis problem, and in many

Operation Dimension 85 Rules _ Server Other

1. Capacity first, optimization second-this rule takes effect when a failure occurs. When you are down, do not study any optimizations, restore the device first. 2. Keep all the records that can be captured--take PostgresQL as an example, including WAL files, slony replication, snapshot technology, DB version based on the hard disk (included with the snapshot) 3. Do not introduce more problems because of optimization. Usually the things we do when we solve the problem turn into the burden of t

The development direction of automatic operation and dimension _ operation and maintenance automation

only makes the resources no longer waste, but also makes the expansion of business adjustment becomes easier and more cost-effective, and indeed greatly simplifies the traditional sense of operation and maintenance, is the future of small and medium internet companies to develop an important trend. At this time, the operation of the focus will be shifted to the platform architecture selection and optimization, operations need to pay more attention to business characteristics and related to the

Operation Dimension PK Performance

Year came a load-balanced manufacturers to do product training, looked at other people's things, in comparison to their own things, ashamed. Smoking Gap and colleagues chat, they saw the manufacturer's products, said not to think that there is more novelty, nothing more than a brand of standardized products on the market, but in my opinion, not only see their own shortcomings, but also see a lot of domestic network equipment manufacturers between the PK point of misunderstanding. What makes me f

Adobe cs4 common Cracking Method

I believe many netizens will feel that after reading the Adobe cs4 series product Cracking Method I wrote, there will be a similar solution. This is also the "Fatal" disadvantage of Adobe products. As long as you crack the amtlib. dll library file in Adobe products, you can easily and without restrictions Use Adobe cs4

Adobe Creative Suite 3 is now available in simplified Chinese. You can download it.

Adobe Creative Suite 3 software will share efficient functions (such as managing visual resources and accessing useful online services) it is a combination of basic creation tools designed for printing, web, film, video, and mobile devices. Design Web Production Premium Master Collection Premium Standard Premium Standard Adobe

Improve the boot speed of Adobe Reader

Adobe Reader is one of our most common electronic document reading tools, mainly for reading PDF documents. But it is well known that it starts too slowly. However, if I tell you that opening Adobe Reader can be as fast as opening word, you won't believe it. Let's take a look at the way to speed up Adobe Reader, believe it or not, it's not up to you! Why not acr

Adobe Dreamweaver and Flash CS3 Download _ Common Tools

Dreamweaver has added Spryspry. Spry is the Ajax Framework launched by Adobe (Spry Demospry Demo), which seamlessly integrates with Dreamweaver to complete program code in a drag-and-drop fashion. The Adobe CS3 (Creative Suite 3) includes:· Adobe Photoshop CS3 (not bundled with ImageReady)· Adobe Illustrator CS3·

Android-Error: "Invalid 9-patch, cannot is less than 3 pixels in a dimension"

error: "Invalid 9-patch, cannot is less than 3 pixels in a dimension"This address: Http://blog.csdn.net/caroline_wendyError: "Invalid 9-patch, cannot is less than 3 pixels in a dimension:invalid 9-patch, cannot is less than 3 pixels in a Dime Nsion "Reason: 9-patch file name, name error. The original name is ". 9.png", delete ". 9" , press the error message, modify the relevant file name. When you modify the file name, you need clean project to clear

How to determine the php array dimension (php array length)

How to determine the php array dimension (php array length) /** * Returns the array dimension. * @ Param [type] $ arr [description] * @ Return [type] [description] */Bbs.it-home.org Function arrayLevel ($ arr ){ $ Al = array (0 ); Function aL ($ arr, $ al, $ level = 0 ){ If (is_array ($ arr )){ $ Level ++; $ Al [] = $

PHP judges the encapsulated functions of the Array dimension

: This article mainly introduces PHP to judge the encapsulated functions of Array dimensions. For more information about PHP tutorials, see. Sometimes need to judge the dimension of the array, the internet to check a lot of things similar to the http://www.poluoluo.com/jzxy/201306/215088.html writing this way, pulling and do not understand what meaning. I wrote the following: Privatestaticfunctionarray_depth ($ array) {if (! Is_array ($ array) retu

PHP implements multi-dimensional array to convert string and multi-dimensional array to one-dimensional array. multidimensional dimension _ PHP Tutorial

PHP implements multi-dimensional array to convert string and multi-dimensional array to one-dimensional array, multidimensional dimension. PHP implements multi-dimensional array to convert string and multi-dimensional array to one-dimensional array. This article describes how PHP implements multi-dimensional array to convert string and multi-dimensional array to one-dimensional array. PHP implements multi-dimensional array to convert string and multi-

PHP variable-dimension array to remove null values

Recently encountered a problem, is the indefinite dimension array of empty values removed, back to study, write out, do not know whether or not to optimizeWrite bad, if there is a good idea or a good way to achieve, welcome to come, if there is wrong, also welcome Daniel can explainThe code is as follows, please correct mefunction Array_remove ($arr){First judge is not an arrayif (!is_array ($arr)) return false;foreach ($arr as $key = $value){if (Is_a

What is VC dimension?

Refer to "Introduction to machine learning"Suppose we have a dataset that contains n points. These n points can be labeled as positive and negative examples using 2N methods. Therefore, the n number of points can define 2N different learning problems. If for any of these problems we are able to find a hypothesis that H belongs to H, separating the positive and negative examples, then we call H hash n points. That is, any learning problem that can be defined with n points can be learned from an a

PHP judges the dimension of Array (encapsulated function)-php Tutorial

PHP judge Array dimension (encapsulated function) sometimes need to judge the dimension of the array, the Internet to query a lot of things similar to http://www.poluoluo.com/jzxy/201306/215088.html writing this way, pull miscellaneous and do not understand what meaning. I wrote the following: Private static function array_depth ($ array) {if (! Is_array ($ array) return 0; $ max_depth = 1; foreach ($ ar

PCA Data Dimension Reduction

Principal Component Analysis Algorithm advantages and disadvantages: Pros: Reduce data complexity and identify the most important features Cons: Not necessarily required, and may lose useful information Applicable data type: numeric data Algorithmic thinking: The benefits of dimensionality reduction: Make data sets easier to use Reduce the computational overhead of many algorithms Noise removal Make the results understandable The idea of principa

Learning touch and matrix dimension

On the first page, I spent four hours reading the Help File of MATLAB from the first page to the 39th page. MATLAB learners are more niche than C language learners, so you cannot find many things online. You can only query help files. Thanks to MATLAB, it provides extremely detailed help files. (But I am a scum) 1: directly use the help command: help what you want to query, but the display is relatively rough 2: Enter helpdesk in the command interface. The help navigation window is displayed. 3:

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