Query Processing in Database Machines.- The Intelligent Database Machine (IDM).- Relational Query Processing on the NON-VON Supercomputer.- Section VIII. Physical Database Design.- Progress Toward Automating the Development of Database System Software.- Physical Database Design: Techniques for ...
常见的组织 pipeline 的有 pull 和 push 两种模式,这两种模式的优劣有很多经典论文分析,本章讲得比较基础,这里暂不做记录。 15.8 Query Processing in Memory 这一小节讲当数据读到内存中之后查询执行有哪些潜在优化的点: 利用好 cache。现代 CPU 拥有多级缓存。目前常用的 CPU 通常具有大约 64KB 的 L1 缓存,其...
Query processing in database systems Section I. Introduction to Query Processing.- to Query Processing.- Section II. Query Processing in Distributed Database Management Systems.- Query Process... W Kim,DS Reiner,DS Batory - Springer-Verlag 被引量: 233发表: 1985年 SAP HANA distributed in-memory...
Parallel Query Processing in Object-Oriented Database Systems Because of the wide acceptance of object-oriented database systems, query processing and indexing have become an important factor in the success of object-oriented database systems, especially when we deal with composite objects. To tack....
Sanjay Chawla, in Encyclopedia of Social Measurement, 2005 Query Processing As noted earlier, a database user interacts with the database using a declarative query language such as SQL. The user specifies only the result desired, and not the algorithm to retrieve the result. The DBMS must ...
the table within respective storage system extents of the storage system; identifying, using the zone data, at least one excludible extent of the storage system extents; and excluding the at least one excludible extent from an IO data access operation in processing of the invoked database query...
CMU Database Systems - Query Processing Query Model Query处理有三种方式, 首先是Iterator model,这是最基本的model,又称为volcano,pipeline模式 他是top-down的模式,通过next函数去逐层获取tuple 好处是比较简单,并且很容易做limit iterator的例子, 输出一个数据,从top开始调用next,这里第二步需要join,建hashtable...
这是因为,使用列表预取也是有前提条件的:它需要事先知道需要取哪些数据页,然后才能为磁盘控制器提供区块请求列表。否则胡乱提供请求列表,将带来大量不必要的I/O,效率不升反降。(参看:《DB2数据库查询过程(Query Processing)---表扫描与I/O(Table Scan and I/O)》) 对于...
Database System Concepts, 5th Ed.Silberschatz, Korth and SudarshanSee www.db for conditions on reuse Silberschatz, Korth
ALTERDATABASE[WideWorldImportersDW]SETCOMPATIBILITY_LEVEL =160; The following table details all intelligent query processing features, along with any requirement they have for database compatibility level. For complete details on all IQP features, including release notes and more in-depth descriptions, ...