data warehousing fundamentals a comprehensive guide for it professionals phần 4 ppsx

... performs three tasks to detect phishing sites: ã The Web site addresses you visit are compared to a list of known legitimate Web sites to ensure legitimate sites are not blocked. ã The Web sites ... NAP enforcement. For example, DHCP enforcement requires a DHCP NAP EC. The required ECs are part of Windows Vista and may also be released for Windows XP SP2. IPsec Enforcement IPs...

Ngày tải lên: 07/08/2014, 02:23

... 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 ... 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

... 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

... source operational systems, data extraction tools, data transformation tools, the data dictionary definitions, and other sources all contribute to the data warehouse metadata. Metadata management, ... navigate through the data ware- house and any data marts. From the outset, pay special attention to metadata for your data warehouse environ- ment. Prepare a metadata initiativ...

Ngày tải lên: 08/08/2014, 18:22

... Data 123 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 234 BBBBB 345 CCCCC DATA STAGING Key Data 123 AAAAA 234 BBBBB 345 CCCCC DATA STAGING B EF O R AF TE R Key ... extracted data is raw data and it cannot be applied to the data warehouse. First, all the extracted data must be made usable in the data w...

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

... 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 to function in a Web-enabled data warehouse. 10. ... organizations gather enterprise data from the source operational systems, move the data through a transformation and cleansing process, and store the data in...

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 i...

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 ... huge amounts of data that has taken years to gather and accu- mulate. The historical data may go back 10 or even up to 20 years. Before the data arrives at the data warehouse,...

Ngày tải lên: 08/08/2014, 18:22

... summary list of processes in which metadata is significant for IT: ț Data extraction from sources ț Data transformation ț Data scrubbing ț Data aggregation and summarization ț Data staging ț Data ... the classification of metadata types by the functional areas in the data warehouse: 1. Data acquisition 2. Data storage 3. Information delivery Data Acquisition In this ar...

Ngày tải lên: 08/08/2014, 18:22

... warehouse data models, source-staging area mappings, staging area- warehouse mappings, data extraction rules, data transformation rules, data cleansing rules, data aggregation rules, data loading and ... METADATA 197 METADATA REPOSITORY Information Navigator Technical Metadata Business Metadata Source systems data models, structures of external data sources, staging area file...

Ngày tải lên: 08/08/2014, 18:22

... monitoring: data management (record keeping and data handling) and data quality (quality assurance and quality control). Record-keeping and handling of data All steps involved in data management should ... several confused volumes of information into tables and This is trial version www.adultpdf.com 88 A practical guide for health researchers succinct paragraphs. He was able to...

Ngày tải lên: 10/08/2014, 07:20

... Alkalinity Background Acidity Alkalinity Importance of Alkalinity Criteria and Standards for Alkalinity Calculating Alkalinity Calculating Changes in Alkalinity, Carbonate, and pH 3. 6 Hardness Background Calculating ... concentration of CaCO 3 . Example 3. 3 A groundwater sample contains 30 0 mg/L of bicarbonate at pH = 10.0. Calculate the carbonate alkalinity as CaCO 3 ....

Ngày tải lên: 11/08/2014, 13:21

... Gravity pulls water downward. 2. Water pressure in the aquifer acts upward against gravity. 3. Capillary forces at the interface between the saturated and unsaturated zones also act upward against ... 3-ring aromatic hydrocarbons. Using calibration standards for the water-soluble fractions improves the accuracy of identifying water sample contaminants. L1 354 /ch 05/ Frame Page 133 Tuesda...

Ngày tải lên: 11/08/2014, 13:21