III: Small: DBMS+: Management System for the Next-Generation Database

近年来开发了大量的数据处理系统-包括NoSQL系统、列存储、MapReduce、数据流管理器、复杂事件处理器、内存中的数据库等。当应用程序的需求与这些系统中的多个系统的功能匹配时，应用程序开发人员很难选择一个系统。当应用程序的不同组件适合不同系统的功能时，选择就变得相当困难。创建和调优这样的多系统应用程序需要大量的手工工作。当前的应用程序与各个系统紧密结合，这使得处理应用程序执行需求或工作负载特征的更改变得非常重要。此外，应用程序的数据和工作负载属性可能会随着时间的推移而变化，通常会以不可预测和突发的方式发生变化。因此，最适合应用程序的系统可能会随着时间的推移而变化。当应用程序开发与任何单独的系统紧密耦合时，适应变化可能是困难的。本项目将设计、实现和评估一种称为DBMS+的新型数据库管理系统。传统的数据库管理系统(DBMS)支持具有单个执行引擎和存储引擎的应用程序，而DBMS+集成并管理多个计算和存储系统。应用程序以声明性方式指定其在性能、可用性、一致性、更改和DBMS+成本等方面的执行要求。对于应用程序发出的所有请求(例如，查询)，DBMS+将选择最符合应用程序要求的执行计划。DBMS+中的执行计划的一个新方面是，该计划包括选择一个或多个专门的系统。DBMS+中的优化器负责确定最合适的执行计划，包括为给定的应用程序及其要求选择最合适的计算和存储系统。DBMS+方法有可能解决应用程序开发人员和系统管理员面临的来自数量庞大且数量不断增加的专用系统的障碍。有关更多信息，请参阅项目网站：http://www.cs.duke.edu/starfish/cyclops/

A large number of data processing systems---including NoSQL systems, column-stores, MapReduce, data stream managers, complex event processors, in-memory databases, and others---have been developed in recent years. It can be hard for an application developer to pick one system when the needs of her application match the features of multiple of these systems. The choice becomes considerably harder when different components of an application fit the features of different systems. Considerable manual effort goes into creating and tuning such multi-system applications. Current applications are coupled tightly with individual systems, which makes dealing with changes to application execution requirements or workload characteristics nontrivial. Moreover, an application's data and workload properties may change over time, often in unpredictable and bursty ways. Consequently, the system that is best for an application can change over time. Adapting to change can be hard when application development is coupled tightly with any individual system.This project will design, implement, and evaluate a new breed of Database Management Systems that is termed DBMS+. While conventional Database Management Systems (DBMS) support applications with a single execution engine and a storage engine, a DBMS+ integrates and manages multiple compute and storage systems. An application specifies its execution requirements on aspects like performance, availability, consistency, change, and cost to the DBMS+ declaratively. For all requests (e.g., queries) made by the application, the DBMS+ will select the execution plan that meets the application's requirements best. A novel aspect of the execution plan in a DBMS+ is that the plan includes the selection of one or more specialized systems. The optimizer in the DBMS+ is responsible for determining the most suitable execution plan, which includes choosing the most suitable compute and storage systems for a given application and its requirements. The DBMS+ approach has the potential to address the hurdles that application developers and system administrators face from the vast and growing number of specialized systems.For further information, see the project web site at: http://www.cs.duke.edu/starfish/cyclops/