NYI: Physical Database Design in Parallel Next Generation Database Management Systems

数据库管理系统（DBMS）中的一个基本概念是物理数据独立性，即修改物理数据库方案的能力，而不需要重写实现DBMS的软件或使用数据的应用程序。这个概念使DBMS能够支持多个应用程序，同时优化每个数据库的物理设计，为每个应用程序提供最高的可用性能。本研究的重点是数据库管理系统的替代实现，并研究：(1)物理数据独立性，(2)可以为给定应用程序优化数据物理设计的工具和技术，以及(3)在数据访问模式变化的情况下动态重组数据的技术。主要目标是最大化系统的性能，并在适当的时候利用并行性。其中一些研究是在关系数据模型的上下文中进行的。该研究项目集中于面向对象的数据模型和其他当前和新兴的数据模型（即，用于表示和操作数据的一系列逻辑构造）。这项研究有望显著提高当前和下一代dbms的性能。//

A fundamental concept in database management systems (DBMSs) is that of physical data independence, i.e., the ability to modify the physical database scheme without requiring a rewrite of the software that implements the DBMS or the application programs that use the data. This concept enables a DBMS to support multiple applications and at the same time optimize the physical design of each database to provide each application with the highest performance available. This research focuses on alternative implementations of database management systems and investigates: (1) physical data independence, (2) tools and techniques that can optimize the physical design of data for a given application, and (3) techniques for dynamic reorganization of data in the presence of changing patterns of data access. The main objective is to maximize the performance of a system, and whenever appropriate, to utilize parallelism. Some of this research has been conducted in the context of the relational data model. This research project concentrates on the object-oriented data model and other current and emerging data models (i.e., a family of logical constructs for representation and manipulation of data). This research is expected to significantly enhance the performance of the current and next generation DBMSs. //