Towards a Toolkit for Active Databases

小行星9222926 面向主动数据库的工具包 这是一个为期三年的连续奖励的第一年资助。 这是一项跨机构的合作研究。设计、实施和实验活动在这两个地点进行。 主动数据库为数据库编程提供了一种新的和有前途的范例。 该项目的重点是开发和应用数据库编程语言结构和技术，可用于指定和实现主动数据库。 该项目的一个中心论点是提升“三角洲”，即，对数据库状态的建议修改集，成为数据库编程语言（DBPL）中的一等公民。 虽然之前在有限的上下文和特定的方式中使用过增量，但赫拉克利特语言允许程序员和用户自由地创建，操作和应用增量。 这提供了开发新的机制，支持各种应用程序，包括主动数据库，数据库互操作，假设的数据库访问，并发控制协议，备份和恢复协议，并解决更新之间的冲突的潜力。 这项研究是围绕着一个名为Heraclitus Alg的DBPL的发展，C，C的扩展，结合了关系代数和三角洲，以及关系和三角洲的持久性。 各种各样的主题正在研究与赫拉克利特Alg，C，包括语言设计，优化，并行实现，理论问题，并应用到主动数据库和数据库互操作。 这项研究将产生对主动数据库技术的基本见解，以及使用这种技术的方法，以便通过“信息高速公路”连接的各种数据库能够以一致的方式使用。 ***

9222926 Ghandeharizadeh Towards a Toolkit for Active Databases This is the first year funding of a three-year continuing award. This is an interinstitutional collaborative research. Design, implementation and experimentation activities are conducted at both sites. Active databases present a novel and promising paradigm for programming databases. The Heraclitus project supported by this grant is focused on the development and application of database programming language constructs and techniques that can be used to specify and implement active databases. A central thesis of the project is to elevate "deltas", i.e., sets of proposed modifications to the database state, to be first-class citizens in database programming languages (DBPLs). While deltas have been used before in limited contexts and ad hoc ways, the Heraclitus languages permit programmers and users to freely create, manipulate and apply deltas. This offers the potential of developing novel mechanisms for supporting a variety of applications including active databases, database interoperation, hypothetical database access, concurrency control protocols, backup and recovery protocols, and resolving conflicts between updates. The research is centered around the development of a DBPL called Heraclitus Alg,C , an extension of C that incorporates the relational algebra and deltas, and persistence for relations and deltas. A variety of topics are being studied in connection with Heraclitus Alg,C , including language design, optimizations, parallel implementations, theoretical issues, and applications to active databases and database interoperation. The research will yield fundamental insights into active database technology, and also methodologies for using this technology so that diverse databases connected by the "information highway" can be used in a coherent manner. ***