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发表于 2025-3-21 16:57:13
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禁令
发表于 2025-3-21 23:17:22
Database schema design theory: Achievements and challenges,ema design aims at both faithful formalization of the application and optimization at design time. It is guided by four heuristics: Separation of Aspects, Separation of Specializations, Inferential Completeness and Unique Flavor. A theory of schema design is to investigate these heuristics and to pr
Abbreviate
发表于 2025-3-22 03:15:53
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机警
发表于 2025-3-22 04:44:37
Calibration of a DBMS cost model with the software testpilot,m. Despite the large body of research on optimization rules and cost approximation, little effort has been invested in the design of effective techniques for their validation. In this paper we discuss a method to calibrate cost models using the Software Testpilot, a performance assessment tool. The
制定法律
发表于 2025-3-22 11:00:37
,’Favourite’ SQL-statements — An empirical analysis of SQL-usage in commercial applications,ractical meaning of the DML-Part of SQL language constructs. A cost-efficient method of data collection for IBM-DB2 environments is described. We also propose a simple complexity scheme for classifying SQL statements and apply it to our data. Some of our findings are compared with SQL-features used
继承人
发表于 2025-3-22 16:23:49
Static allocation in Distributed Objectbase Systems: A graphical approach,he capability of the OO-models to manage and represent information of any arbitrary complexity. Distributed Objectbase Systems (DOBS) combines the benefit of distributed processing and the power of manipulation and abstraction of complex information to provide a powerful environment for distributed
ETCH
发表于 2025-3-22 17:21:50
Estimating data accuracy in a federated database environment,integrated data as a function of the accuracy of the originating data sources. Even in a single database system, different base relations are frequently characterized by dissimilar levels of accuracy; however, no technique exists for defining the accuracy of this single database system in terms of t
anticipate
发表于 2025-3-22 23:08:12
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错事
发表于 2025-3-23 04:29:55
The use of an object repository in the configuration of control systems at CERN,integrating computer control systems across computer networks using standard protocols and interfaces. Cortex has two major functionalities: a configuration based tool for describing the components to be connected and their interfaces, and an on-line message passing system. An Object Oriented Databa
Diskectomy
发表于 2025-3-23 07:03:25
Implementation and performance evaluation of compressed bit-sliced signature files,mmercial DBMS product based on an extended relational data model. This is our first experience of practical implementation of this access method, although some experimental implementations exist. We discuss some design topics which turn into issues in practical environment..We also describe the resu