Towards a Toolkit for Active Databases

9222926加德哈里扎德建立主动数据库工具包这是对为期三年的持续奖励的第一年资助。这是一项跨机构的合作研究。在两个地点都进行了设计、实施和试验活动。主动数据库为数据库编程提供了一种新颖而有前途的范例。这笔赠款支持的Heraclitus项目侧重于数据库编程语言结构和技术的开发和应用，这些结构和技术可用于指定和实施活动数据库。该项目的一个中心论题是将“增量”，即对数据库状态的拟议修改集，提升为数据库编程语言(DBPL)的一等公民。虽然以前在有限的上下文和特殊的方式中使用过增量，但Heraclitus语言允许程序员和用户自由地创建、操作和应用增量。这提供了开发用于支持各种应用的新机制的潜力，这些应用包括活动数据库、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。研究的中心是名为Heraclitus Alg，C的DBPL的开发，它是C的扩展，结合了关系代数和增量，以及关系和增量的持久性。正在研究与Heraclitus Alg，C有关的各种主题，包括语言设计、优化、并行实现、理论问题以及主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，以及使用该技术的方法，以便能够以一致的方式使用通过“信息高速公路”连接的不同数据库。***

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. ***