Objects DBMS have provided better capabilities to manage more complex data. Multimedia Query processing is relatively more complex than normal query processing in a traditional context in which only formatted data are considered. The main problem is the heterogeneity of data processed by the multimedia...
在列存储 DBMS 中,每个 operator 只选取查询所需的列数据,若该列数据在查询树上方并不需要,则仅需向上传递 offsets 即可: Heap Clustering 使用clustering index 时,tuples 在 page 中按照相应的顺序排列,如果查询访问的是被索引的 attributes,DBMS 就可以直接跳跃访问目标 tuples: Index Scan DBMS 选择一个 inde...
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 ...
Query Processing in Multimedia Databases 来自 Semantic Scholar 喜欢 0 阅读量: 20 作者: K Oya 摘要: A multimedia database management system (DBMS) provides a suitable environment for using and managing the multimedia database. Multimedia objects, which can be defined as objects that integrate ...
In this paper, we address these query processing issues in two contexts, first as applied to the video data type and then as applied to the stream data type. We first present the query processing functionality of the VDBMS video database management system as a framework designed to support ...
relational query processing的意思是关系查询处理。在计算机科学领域，这通常指的是数据库管理系统对关系数据库执行查询操作的过程。这个过程涉及以下几个关键点：关系数据库：一种基于表格的数据库模型，其中数据存储在表中，表由行和列组成，每行代表一个记录，每列代表一个字段。查询操作：用户或应用程序...
DBMS 的 processing model 定义了系统如何执行一个 query plan。目前主要有三种模型: 迭代模型(Iterator Model) 物化模型(Materialization Model) 向量化/批处理模型(Vectorized/Batch Model) 不同模型适用于不同的 workload。 2.1 Iterator Model 最常见的 processing model,也称为 Volcano/Pipeline Model。
DBMS是统一管理和控制数据.安全性保护、完整性检查、并发操作、数据恢复. 数据库中的数据是长期存储的,有组织存储的,为不同的用户提供数据的操作,保证了数据的完整性、安全性. 数据模型(Data Model) 数据模型是对客观世界中的某些事物的特征数据抽象和模拟,是严格定义的一组概念,即数据模型是用来描述、组织数据并对...
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 ...
As we discussed in Chapter 1, these systems are logically integrated and provide a single image of the database, even though they are physically distributed. In this chapter, we concentrate on query processing in multidatabase systems that provide interoperability among a set of DBMSs. This is...