計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)(編輯修改稿)

2026-02-24 02:15 本頁面

　

【文章內(nèi)容簡介】 an interesting alternative to the traditional approach of heterogeneous database integration described above. Rather than using a querydriven approach, data warehousing employs an updatedriven approach in which information from multiple, heterogeneous sources is integrated in advance and stored in a warehouse for direct querying and analysis. Unlike online transaction processing databases, data warehouses do not contain the most current information. However, a data warehouse brings high performance to the integrated heterogeneous database system since data are copied, preprocessed, integrated, annotated, summarized, and restructured into one semantic data store. Furthermore, query processing in data warehouses does not interfere with the processing at local sources. Moreover, data warehouses can store and integrate historical information and support plex multidimensional queries. As a result, data warehousing has bee very popular in industry. between operational database systems and data warehouses Since most people are familiar with mercial relational database systems, it is easy to understand what a data warehouse is by paring these two kinds of systems. The major task of online operational database systems is to perform online transaction and query processing. These systems are called online transaction processing (OLTP) systems. They cover most of the daytoday operations of an anization, such as, purchasing, inventory, manufacturing, banking, payroll, registration, and accounting. Data warehouse systems, on the other hand, serve users or “knowledge workers in the role of data analysis and decision making. Such systems can anize and present data in various formats in order to acmodate the diverse needs of the different users. These systems are known as online analytical processing (OLAP) systems. The major distinguishing features between OLTP and OLAP are summarized as follows. (1)Users and system orientation: An OLTP system is customeroriented and is used for transaction and query processing by clerks, clients, and information technology professionals. An OLAP system is marketoriented and is used for data analysis by knowledge workers, including managers, executives, and analysts. (2)Data contents: An OLTP system manages current data that, typically, are too detailed to be easily used for decision making. An OLAP system manages large amounts of historical data, provides 3 facilities for summarization and aggregation, and stores and manages information at different levels of granularity. These features make the data easier for use in informed decision making. (3)Database design: An OLTP system usually adopts an entityrelationship (ER) data model and an application oriented database design. An OLAP system typically adopts either a star or snowflake model, and a subjectoriented database design. (4)View: An OLTP system focuses mainly on the current data within an enterprise or department, without referring to historical data or data in different anizations. In contrast, an OLAP system often spans multiple versions of a database schema, due to the evolutionary process of an anization. OLAP systems also deal with information that originates from differ

點(diǎn)擊復(fù)制文檔內(nèi)容

黨政相關(guān)相關(guān)推薦

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)(編輯修改稿)

計(jì)算機(jī)外文翻譯3-其他專業(yè)-資料下載頁

計(jì)算機(jī)專業(yè)外文翻譯----計(jì)算機(jī)視覺中的學(xué)習(xí)-其他專業(yè)-資料下載頁

計(jì)算機(jī)專業(yè)畢業(yè)設(shè)計(jì)外文翻譯27-其他專業(yè)-資料下載頁

計(jì)算機(jī)基本理論外文翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)科學(xué)與技術(shù)外文翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)外文資料翻譯---visualbasic簡介-其他專業(yè)-資料下載頁

計(jì)算機(jī)控制技術(shù)外文翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)外文資料翻譯---netcompactframework-其他專業(yè)-資料下載頁

物流專業(yè)畢業(yè)論文外文翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)系外文翻譯--歷史的計(jì)算-其他專業(yè)-資料下載頁

計(jì)算機(jī)系外文翻譯---歷史的計(jì)算-其他專業(yè)-資料下載頁

計(jì)算機(jī)畢業(yè)論文畢業(yè)論文計(jì)算機(jī)專業(yè)-資料下載頁

計(jì)算機(jī)專業(yè)畢業(yè)論文外文翻譯--如何解決sqlserver2000中的連接問題-其他專業(yè)-資料下載頁

計(jì)算機(jī)技術(shù)簡介外文翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)科學(xué)與技術(shù)外文資料翻譯-其他專業(yè)-資料下載頁

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)-閱讀頁

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)(文件)

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)-全文預(yù)覽

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)-預(yù)覽頁

計(jì)算機(jī)英語畢業(yè)論文外文翻譯-其他專業(yè)-免費(fèi)閱讀