Titlebook: Information Systems Reengineering, Integration and Normalization; Joseph Shi Piu Fong Textbook 20153rd edition Springer International Publ

intention

Data Conversion,The objective of data conversion is to convert between database systems without any loss of information. The data conversion process must transform the data from one data structure to another whilst preserving its semantics. Data conversion uses the data structure of the schema that results from schema translation.

注意力集中

Information Systems Reengineering, Integration and Normalization,er, except for the quick availability of more accurate management reporting information, such operations were automated without fundamental changes. During these two decades, data was stored in flat file formats that could be classified into two different forms, namely batch files and online files.

车床

Outwit

Schema Translation,of data and their relationship in different models. Only after a schema has been redefined can data and programs be reengineered into a new database system, which makes use of the translated schema. Schema translation is the process of changing a schema expressed in one data model into an equivalent schema expressed in a different data model.

废除

馆长

可用

DUST

航海太平洋

Database Program Translation,han the previous nonrelational (e.g., hierarchical or network model) database model. However, it was not adopted by the industry until the early 1980s because of its poor performance. Throughout the 1980s, the performance of relational databases improved and gained wider industry acceptance. This cr

Pandemic