Query processing refers to the sequence of steps that the DBMS will initiate to process the query. Queries can be broadly divided into two categories: single-scan queries and multiscan queries. In a single-scan query, a record (tuple) in the table (relation) being queried has to be ...
The success of relational database technology in data processing is due, in part, to the availability of non-procedural languages (i.e., SQL), which can significantly improve application development and end-user productivity. By hiding the low-level details about the physical organization of the...
Additionally, the diverging mathematical foundations of data processing and machine learning hinder cross-optimizations by combining these two components, thereby overlooking potential opportunities to expedite predictive pipelines. In this paper, we propose an operator fusion method based on GPU-accelerated ...
I/O tuning Hardware and software configuration of disk subsystems are examined DBMS tuning DBMS tuning refers to tuning of the DBMS and the configuration of the memory and processing resources of the computer running the DBMS. Database maintenance Database maintenance includes backups, column statist...
关键词:Query Optimization, Cost Model, MPP, Parallel Processing 前言 大数据带来了对查询优化的新兴兴趣,因为一种新型的数据管理系统在可扩展性、可用性和处理能力方面推动了前所未有的突破(例如,[9,18,20,21]),这使得数百TB甚至PB级别的大型数据集可以通过SQL或类似SQL的接口轻松进行分析。优化器的好坏差异一直...
Overview of Query RewriteOne of the major benefits of creating and maintaining materialized views is the ability to take advantage of query rewrite, which transforms a SQL statement expressed in terms of tables or views into a statement accessing one or more materialized views that are defined on...
Query processing in a multidatabase system consists of four tasks. First, queries over the user’s integrated view must be modified into equivalent queries over the local schemas of the existing databases. Second, the modified queries must be globally optimized to produce an efficient global ...
Different classes of queries benefit users in different ways. Their needs should be weighed carefully when designing document-retrieval systems or selecting applications with which to test them. Strategic Overview Today, data is highly structured and carefully organized. Users can retrieve information quic...
Modern database management systems (DBMS), primarily designed as general-purpose systems, face the challenging task of efficiently handling data from diverse sources for both analytical services and online transactional processing (OLTP). The volume of d
Transactional consistency is provided as a part of the overall transaction processing capability of the DBMS. There are many complicated implementation features used to implement transactional processing and transactional consistency. Among them is the generation and use of transactional metadata to compute ...