数据建模 Database Modeling:概念 (Conceptual) vs 逻辑 (Logical) vs 物理数据 (Physical) 模型 数据建模是一种使用实体关系图(ER图)记录软件系统的技术,实体关系图是公司数据库表中数据结构的表示。它是公司业务需求的非常有力的表达。数据模型有多种用途,从高级概念模型、逻辑到物理数据模型,通常由实体关系图表示...
Physical data models hone in on the details of the underlying data structures, providing a detailed representation of the database schema, including tables, columns, data types, indexes, and storage details. Physical data modeling is closely tied to the database management system (DBMS) and storag...
Data Modeling is a process of formulating data in an information system in a particular structure so that it can help in easy reporting in future. It helps in analyzing data that will further help in meeting business requirements.
logical vs. physical data modeling Conceptual, logical, and physical data models each serve a key function in the data modeling process. A conceptual model provides a high-level system overview, focusing on the main entities and relationships without going into technical details. A logical model ...
The three levels of data modeling, conceptual data model, logical data model, and physical data model, were discussed in prior sections. Here we compare these three types of data models. The table below compares the different features: Feature...
data elements and to set relationships between them. The logical data model adds further information to the conceptual data model elements. The advantage of using a Logical data model is to provide a foundation to form the base for the Physical model. However, the modeling structure remains ...
While DFDs are used in process modeling of systems, data modeling is often done withEntity Relationship Diagrams (ERDs)to show what the data is in the system. For object modeling,Unified Modeling Language (UML)best describes the “what” and “why” logic of the system. DFDs also differ fro...
Unified modeling language,Data models,NoSQL databases,Relational databases,Scalability,Computational modelingTraditional relational database design uses conceptual, logical, and physical modeling based on Peter Chen's methods. UML (Unified Modeling Language), though being a set of software development tools...
Data store Collections of data Physical files and databases, manual files Type of data store Permanent data collections Master files, transaction files System controls Business controls Controls for data validation, record status, system security Related Links Best DFD modeling tool Try Visual Paradigm ...
translate the conceptual model into a more detailed representation, focusing on data structures, relationships, and constraints. The logical design is independent of any specific database management system (DBMS) and is often expressed using Entity-Relationship Diagrams (ERDs) or similar modeling ...