Data Warehousing Fundamentals A Comprehensive Guide for IT Professionals phần 1 ppt

... Data updates are commonplace in an operational database; not so in a data warehouse. The data in a data warehouse is not as volatile as the data in an operational database is. The data in a data ... End-Users 17 7 1 Why Metadata is Essential for IT 17 9 1 Automation of Warehousing Tasks 18 1 1 Establishing the Context of Information 18 3 1 Metadata Types...

Ngày tải lên: 08/08/2014, 18:22

... 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 ... Component Metadata in a data warehouse is similar to the data dictionary or the data catalog in a database management system. In the data dictionary, you keep the informatio...

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 19 7 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...

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 dat...

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 12 3 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 12 3 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 12 3 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 12 3 AAAAA 234 BBBBB 345 CCCCC DATA STAGING B EF O R AF TE R Key ... CCCCC DATA STAGING B EF O R AF TE R Key Data 555 PPPPP 666 QQQQ 777 HHHH WAREHOUSE Key Data 12 3 AAAAA 234 BBBBB 345 CCCCC WAREHOUSE Lo...

Ngày tải lên: 08/08/2014, 18:22

... organizations gather enterprise data from the source operational systems, move the data through a transformation and cleansing process, and store the data in data warehouses in a form suitable for ... Prefabricated multidimensional cubes are not created beforehand and stored in special databases. The relational data is presented as virtual multidimensional data cubes. 364 O...

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 ... suitable for low-selectivity data? Why? 9. What is data partitioning? Give two reasons why data partitioning is helpful in a data warehousing environment. 10 . What...

Ngày tải lên: 08/08/2014, 18:22

... 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 may contain too much historical data. Data ... Backup Referential integrity, 4 51 Refresh, data, 282–283. See also Data loading Replication, data, 266–268 Reports, 332–333 Requirements driving force for architecture plan, 11...

Ngày tải lên: 08/08/2014, 18:22