Data Warehousing Fundamentals A Comprehensive Guide for IT Professionals phần 2 ppt

... 3-8 Integration of KM and data warehouse. Types of Metadata Metadata in a data warehouse fall into three major categories: ț Operational Metadata ț Extraction and Transformation Metadata ț End-User ... metadata contain all of this information about the operational data sources. Extraction and Transformation Metadata. Extraction and transformation metada- ta contain data about the...

Ngày tải lên: 08/08/2014, 18:22

... a data warehouse is not as volatile as the data in an operational database is. The data in a data warehouse is primarily for query and analysis. Data Granularity In an operational system, data ... Time-Variant Data 22 1 Nonvolatile Data 23 1 Data Granularity 23 1 Data Warehouses and Data Marts 24 1 How are They Different? 25 1 1 Top-Down Versus Bottom-Up A...

Ngày tải lên: 08/08/2014, 18:22

... poten- tial effect of bad data. The low-priority data may be cleansed if you have any time and re- DATA QUALITY INITIATIVE 309 DATA QUALITY INITIATIVES DATA CONSUMER (User Dept.) DATA EXPERT (User ... companies serious about data quality pull all these factors together and establish a data quality framework. Essentially, the framework provides a basis for launching data...

Ngày tải lên: 08/08/2014, 18:22

... Able to separate and store logical and physical database models. HOW TO PROVIDE METADATA 197 METADATA REPOSITORY Information Navigator Technical Metadata Business Metadata Source systems data ... external data sources, staging area file layouts, target warehouse data models, source-staging area mappings, staging area- warehouse mappings, data extraction rules, data transformation r...

Ngày tải lên: 08/08/2014, 18:22

... Chapter 2: ț Source data Production data Internal data Archived data External data ț Data staging Data extraction Data transformation Data loading ț Data storage ț Information delivery ț Metadata ț ... internal and external data sources form the source data architectural component. Source data governs the extraction of data for preparation and storage in the d...

Ngày tải lên: 08/08/2014, 18:22

... streams Data Storage ț Data models for centralized data warehouse and dependent data marts ț Subject area groupings of tables ț Data models for conformed data marts ț Physical files ț Table and ... source operational systems, data extraction tools, data transformation tools, the data dictionary definitions, and other sources all contribute to the data warehouse metada...

Ngày tải lên: 08/08/2014, 18:22

... Data 123 AAAAA 23 4 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 23 4 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 23 4 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 23 4 BBBBB 345 CCCCC DATA STAGING B EF O R AF TE R Key ... try to access the customer demo- graphics in the data warehouse. The customer data as an integrated whole lacks data qual- ity. WHY IS...

Ngày tải lên: 08/08/2014, 18:22

... low-level array to store base data ț A two-dimensional array of data for dimension-1 and dimension -2 ț A 2- dimensional array of data for dimension -2 and dimension-3 ț A high-level summary array by ... data security a major concern for a Web-enabled data warehouse? 8. List any four features of the data Webhouse. 9. Name any two approaches for an OLAP system...

Ngày tải lên: 08/08/2014, 18:22

... just a couple of ex- amples. Review all the initialization parameters and set each appropriately. Data Arrays What are data arrays? Suppose in a financial data mart you need to keep monthly balances of ... free H. data addresses in leaf nodes 9. bitmapped index I. store on separate devices 10. data array J. suspend for loading 2. Prepare an outline for a standards manual...

Ngày tải lên: 08/08/2014, 18:22

... supporting, 25 1 25 3 STAR schema advantages, 22 0 22 3 example, 21 0 21 1 formation of, 20 8 keys, 21 8 22 0 navigation, optimized with, 22 1 22 2 query processing, most suitable for, 22 2 22 3 Steering committee, data ... start with a large volume of data, even a small percentage increase can result in substantial additional data. In the first place, a data warehouse m...

Ngày tải lên: 08/08/2014, 18:22