Mastering Data Warehouse DesignRelational and Dimensional Techniques phần 6 pps

... Loaf Potatoes 01 160 ENTR02319 01 160 ENTR02323 SP SP 118 119 12001 160 ENTR04392SP PR PR PR PR PR PR DV DV DV DV 124 124 124 124 124 1 26 1 26 1 26 1 26 1 26 1 06 113 119 1 26 Row type Business key Surrogate primary key Parent ... 7 224 data warehouse. Finally, the data warehouse refers to both the model and physical instantiation of the database. There at two general categor...

Ngày tải lên: 08/08/2014, 22:20

... Table (Data to be loaded into the DW) Data Warehouse SOURCE SYSTEM ENVIRONMENT Cleansing, Selection, Change Data Capture Archive Data Load data into data warehouse Archived (Complete) Source Data Extraction (Extract ... added to the data warehouse) and usage (to reduce the need to join data to satisfy queries. These steps help organize the data to meet performance o...

Ngày tải lên: 08/08/2014, 22:20

... Week 165 Holidays 166 Holiday Season 167 Seasons 168 Calendar Time Span 169 Time and the Data Warehouse 169 The Nature of Time 169 Standardizing Time 170 Data Warehouse System Model 172 Date Keys ... Solution 359 Data Mart Chaos 360 Why Is It Bad? 362 Criteria for Being in-Architecture 366 Migrating from Data Mart Chaos 367 Conform the Dimensions 368 Create the Data...

Ngày tải lên: 08/08/2014, 22:20

... apply the business data model include operational systems, data warehouse, and data mart databases, and the model provides the meta data (or information about the data) for these databases to help ... case of a data warehouse, these inter- faces include the data acquisition and the data delivery programs, where and when to perform data cleansing, audits, data main...

Ngày tải lên: 08/08/2014, 22:20

... the data warehouse is to store historical data from dis- parate systems, the data warehouse data model needs to consider the defini- tions in the source systems, and we will address the data warehouse ... data provided with the data marts needs to explicitly explain the data that is included or excluded. This is another advantage of segregating the functionality of the...

Ngày tải lên: 08/08/2014, 22:20

... be handled in the data marts rather than the data warehouse. The first two approaches, database and query tool localization, rely on functionality of those software components to handle data presentation. ... patterns and rates, and a common standard time to analyze network traffic. If there is a requirement for a common standard time, you must store the local time and date as...

Ngày tải lên: 08/08/2014, 22:20

... arrange data and indexes within the data- base and their applicability to the data warehouse environment. Next, we examine processing techniques to improve load and publication performance. Data ... everything in this Data Warehouse Optimization 299 environment, and the only way to ensure proper checks is to handle them at the database level. A data warehouse, on th...

Ngày tải lên: 08/08/2014, 22:20

... system model and require changes to the processes that load and deliver data in the data warehouse. Because of the side effects of such changes, these techniques are best applied during initial database ... models. A technology model exists for the data warehouse and for each of the data marts. When there is a change to a data mart, changes in the data warehouse model...

Ngày tải lên: 08/08/2014, 22:20

... the data in the chosen mart for what data belongs in the data warehouse data versus the data used in the data mart. Your job is to separate the data into the data model for the data warehouse and ... The data acquisition programs are designed, coded, tested, and executed. You then begin loading the data warehouse. 3. Map the data mart data model to the dat...

Ngày tải lên: 08/08/2014, 22:20

... 165 – 166 elements, 165 – 168 factory calendar, 164 – 165 fiscal calendars, 159, 164 – 165 Fiscal Date entity, 192 Gregorian calendar, 158 holiday season, 167 – 168 holidays, 166 – 167 influencing businesses, 167 multiple ... data marts in a single database instance. Data Warehouse Data Model The data warehouse data model is the “sys- tem” model for the data warehouse...

Ngày tải lên: 08/08/2014, 22:20