propose analysis requirements on the first day and wait until the second day to obtain the calculation results. This analysis method is "offline analysis ", low efficiency.To improve data analysis efficiency, OLAP completely breaks the record-based data browsing mode, and separates data into dimensions and measures )":>DimensionIs to observe the data angle, such as the above example of "sales time", "sales location", "product ";>MeasurementIs the spe
OLAP (on-line analysis processing) enables analysts, administrators, or administrators to quickly, consistently, and interactively access information from multiple perspectives, this gives you a better understanding of the data. OLAP is designed to meet decision-making support or specific query and report requirements in multi-dimensional environments. Its core technology is the concept of "dimension. Dimension is a high-level classification from the perspective of observing the objective world.
UV 103 Stacking Boxes (DP), stackingboxesBackground
Some concepts in Mathematics and Computer Science are simple in one or two dimensions but become more complex when extended to arbitrary dimensions. Consider solving differential equations in several dimensions and analyzing the topologyN-Dimen1_hypercube. The former is much more complicated than its one dimen1_
using the multi-dimensional dataset wizard, you can easily define a simple multi-dimensional dataset in SQL Server 2005. This wizard helps you define measurement values and dimensions for cubes. In this wizard, you can define a multi-dimensional dataset based on the data source, or you can define a multi-dimensional dataset without using an existing data source. If you define a cube without using an existing data source, use this wizard to generate an
1. Intention: Separate the abstract part from the implementation part so that they can all change independently.
It is understood that the abstraction and implementation in this sentence do not refer to the implementation of abstract classes and subclasses in OO, but "separating the changes of multiple dimensions in one thing ".
The abstract part in this sentence is separated from the implementation part. You can join the tank and platformimplementati
OverviewBridge mode is a very practical structure design mode, if a class in a software system has two independently changing dimensions, this mode can separate the two dimensions, so that the two can be independently expanded, so that the system more in line with the "single responsibility principle." Unlike a multi-tier inheritance scheme, it designs two independently varying
distance between A and C, but is 10cm of height really equivalent to 10kg of weight? It is therefore problematic to measure the similarity between these samples using he distances.In short, there are two main shortcomings of the He distance: (1) The dimensions of each component (scale), that is, "unit" as the same view. (2) The distribution of each component (expectation, side, etc.) is not considered to be different.(3) MATLAB calculates he distance
of height really equivalent to 10kg of weight? It is therefore problematic to measure the similarity between these samples using he distances.In short, there are two main shortcomings of the He distance: (1) The dimensions of each component (scale), that is, "unit" as the same view. (2) The distribution of each component (expectation, side, etc.) is not considered to be different.(3) MATLAB calculates he distanceExample: Calculating the He distance b
the he distance between A and C, but is 10cm of height really equivalent to 10kg of weight? It is therefore problematic to measure the similarity between these samples using he distances.In short, there are two main shortcomings of the He distance: (1) The dimensions of each component (scale), that is, "unit" as the same view. (2) The distribution of each component (expectation, side, etc.) is not considered to be different.(3) MATLAB calculates he d
Languagemanual joinoptimizationImprovementsto the Hive OptimizerHive can be automatically optimized, and some optimization cases have been improved in hive 0.111, the join side suitable for in memory, has the new optimization schemeA) Read the table into memory in the form of a hash tableb) scan only large tablesc) The fact table uses only a small amount of memory2. Star Join3, in many cases, no longer need hint4. Map Join automatic optimizationStarjoin optimizationFirst introduce the star model
When you work with objects in Microsoft SQL Server analysis Services, you can choose processing options to control the processing type for each object. The processing type varies by object and is based on the changes that occurred to the object since the last time the object was processed. If the Analysis Services auto-Select processing method is enabled, the method that returns the object with the least amount of time to the fully processed state is used. The following table describes the proc
B (either Manhattan distance, Euclidean distance or Chebyshev distance) equals the he distance between A and C, but is 10cm of height really equivalent to 10kg of weight? It is therefore problematic to measure the similarity between these samples using he distances.In short, there are two main shortcomings of the He distance: (1) The dimensions of each component (scale), that is, "unit" as the same view. (2) The distribution of each component (expect
model processing is an infinite sequence of temporal data streams, regardless of the time sequence or the limited data set can be regarded as a special case of infinite chaotic data stream. The Beam model summarizes the issues that users need to consider when doing data processing from the following four dimensions:
What. How is the data calculated? For example, sum,join or training learning models in machine learning. Specified in the Beam
provide the flexible and open report processing function to save the analysis results.
Shared: This means that the system will be able to meet the security requirements of data confidentiality, and even if multiple users are using them at the same time, they will be able to see only the information they should see, depending on the level of security they belong to.
The salient feature of Multidimensional:olap is that it can provide data multidimensional view systems must provide multidimensio
of the dimensions are better differentiated than the other dimensions, such as the 11th and 14th dimensions are better. From these two dimensions, the data appears to be currently available. The 12 and 19 dimensions present a strong negative correlation.
Seaborn.pairplot (d
numbers Arry1. One-dimensional groupnamespacearry{classMyarry {/// ///numbers Arry/// /// Static voidMain (string[] args) { //Sound number datatype[] arryname datatype Specifies the type of element that is stored in the number [] Specifies the dimensions of the number, the rank specifies the size of the number of groups arryname the specified group name int[] n =New int[Ten];//initializing a number of numb
"normal" or "high" density screen.For simplicity, Android categorizes the density of all actual screen densities at four kinds of generalization: low, Medium, High, extra. Direction (Orientation)The screen orientation viewed from the user's perspective. This refers to horizontal screen (landscape) or vertical screen (portrait), which means that the screen aspect ratio (aspect ratio) is wide or high respectively. Note that screens for different devices do not just have the default screen orienta
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