Towards a Toolkit for Active Databases

9222926 Ghandeharizadeh迈向动态数据库工具包这是一项为期三年的持续性奖励的第一年资助。这是一个机构间的合作研究。设计、实施和实验活动在两个地点进行。主动数据库为数据库编程提供了一种新颖而有前途的范式。该基金支持的赫拉克利特项目侧重于数据库编程语言结构和技术的开发和应用，这些语言和技术可用于指定和实现活动数据库。该项目的一个中心论点是提升“delta”，即对数据库状态的建议修改集，使其成为数据库编程语言（dbpl）中的一等公民。虽然增量函数以前只在有限的上下文中以特殊的方式使用过，但赫拉克利特语言允许程序员和用户自由地创建、操作和应用增量函数。这为开发支持各种应用程序的新机制提供了潜力，这些应用程序包括活动数据库、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，以及解决更新之间的冲突。研究的重点是开发一个名为Heraclitus Alg，C的DBPL，它是C的扩展，包含了关系代数和delta，以及关系和delta的持久性。与赫拉克利特Alg，C相关的各种主题正在被研究，包括语言设计，优化，并行实现，理论问题，以及活动数据库和数据库互操作的应用。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连贯的方式使用。＊＊＊

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. ***