Physical database design

Physical database design steps

You need to continually monitor the performance and data integrity as time passes. You need to continually monitor the performance and data integrity characteristics of the database as time passes. Normalization occurs at this level. Physical design is performed in two stages: 1. Bayer R. We haven't yet translated the relationships into the physical data model. Place a CDId column in the Song table.

Common characteristics of a conceptual data model: Identifies important entities and the high-level relationships among them. It is independent of DBMS, technology, data storage or organizational constraints. A logical data model, otherwise known as a fully attributed data model, allows you to understand the details of your data without worrying about how the data will be implemented in the database.

physical database design pdf

The primary key for each entity is specified. No attribute is specified.

physical database design tutorial

Astrahan M. We haven't yet translated the relationships into the physical data model. Find the relationships between different entities.

Introduction to physical database design

We now have a starting point for a physical schema. The bottom line is that this choice should be driven by your criteria for choosing identifiers. A logical data model, otherwise known as a fully attributed data model, allows you to understand the details of your data without worrying about how the data will be implemented in the database. Teorey T. Contains foreign keys used to identify relationships between tables. Attributes become columns in the physical database. We haven't yet translated the relationships into the physical data model. Physical considerations may cause the physical data model to be different from the logical data model. This is a preview of subscription content, log in to check access. Physical Design is accomplished in multiple steps, which include expanding a business model into a fully attributed model FAM and then transforming the fully attributed model into a physical design model. During physical design, you transform the entities into tables, the instances into rows, and the attributes into columns. Does not change the business meaning of the data. Table shows the new schema. As we discussed earlier, once you have refined your data model, you should have mostly 1-to-1 and 1-to-M relationships -- the M-to-M relationships were resolved via junction tables. The primary key for each entity is specified.

However, this task generally requires more experience with Db2 than most readers of this introductory level information are likely to have. Google Scholar 2.

Physical database design sql

Google Scholar 7. Automating physical database design in a parallel database. Consider creating a unique index on the identifiers to enforce uniqueness. The task of building the physical design is a job that truly never ends. Contains foreign keys used to identify relationships between tables. How to translate entities into physical tables What attributes to use for columns of the physical tables Which columns of the tables to define as keys What indexes to define on the tables What views to define on the tables How to denormalize the tables How to resolve many-to-many relationships What designs can take advantage of hash access Physical design is the time when you abbreviate the names that you chose during logical design. Making primary keys of type INT is almost purely arbitrary. Google Scholar 8. Unique identifiers become columns that are not allowed to have NULL values. These are referred to as primary keys in the physical database. Markos Z. Jun R. Conversion of the logical design into table definitions often performed by an application developer : includes pre-deployment design, table definitions, normalization, primary and foreign key relationships, and basic indexing. It is independent of DBMS, technology, data storage or organizational constraints.

No primary key is specified.

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Physical Database Design (MySQL & mSQL)