Beginning Database Design- P22 ppsx

... Databases A standby database is a failover database. A standby database has minimal activity, usually only adding new records, changing existing records, and deleting existing records. Some database ... the realm of database modeling, examining specialized database objects, some brief facts about hardware resources, and finally some specialized database architectures. 401 Advanc...

Ngày tải lên: 03/07/2014, 01:20

... of a database model ❑ The evolution of database modeling ❑ The hierarchical and network database models ❑ The relational database model ❑ The object and object-relational database models ❑ Database ... Database design objectives ❑ Database design methods Grasping the Concept of a Database A database is a collection of information— preferably related information and prefera...

Ngày tải lên: 03/07/2014, 01:20

... multiple types of databases, using different database engines, perhaps even including legacy databases, and really any type of database that can be catered for with whichever database is being ... Legacy Databases Converting legacy databases can often be the most difficult of tasks. Sometimes the databases are partially inaccessible or difficult to access at best. Sometimes the databas...

Ngày tải lên: 03/07/2014, 01:20

... guilty. Mishandling Keywords and Categories A common problem in database design is the failure to properly deal with keywords and categories. Many database applications involve data that is categorized ... exists that needs to be understood before any design of a database should proceed further. As you have seen in the previous chapters, databases are often set up to solve one immedia...

Ngày tải lên: 28/03/2014, 09:20

... Microsoft Access database, dBase database, Oracle Database, MySQL, Ingres, or any relational database — it doesn’t matter. All of the coding in this book is written intentionally to be non -database specific, ... Building Fast-Performing Database Models 193 The Needs of Different Database Models 194 Factors Affecting OLTP Database Model Tuning 194 Factors Affecting Client-Server...

Ngày tải lên: 10/04/2014, 09:05

... 7 Hierarchical Database Model 8 Network Database Model 8 Relational Database Model 9 Relational Database Management System 11 The History of the Relational Database Model 11 Object Database Model ... Model 12 Object-Relational Database Model 14 Examining the Types of Databases 14 Transactional Databases 15 Decision Support Databases 15 Hybrid Databases 16 Understanding Database...

Ngày tải lên: 03/07/2014, 01:20

... for you. 06_574906 ch02.qxd 10/28/05 11:36 PM Page 23 databases. The OLTP database is the source database because the OLTP database is the database where all the transactional information in the ... differences between a database, a database model, and an application ❑ The hierarchical and network database models ❑ The relational database model ❑ The object and object-relationa...

Ngày tải lên: 03/07/2014, 01:20

... within relational databases that some database engines allow and some do not. It is important to know that specialized objects exist as options for expansion to a relational database model, as ... relationships Keys are used to identify and ultimately retrieve records from a database at a later date. Understanding Keys Relational databases use the terms index and key to indicate simila...

Ngày tải lên: 03/07/2014, 01:20

... Anomalies The intention of relational database theory is to eliminate anomalies from occurring in a database. Anomalies can potentially occur during changes to a database. An anomaly is a bad thing ... commercial relational database implementations do not go beyond the implementation of 3NF. This is often true of OLTP databases and nearly always true in properly designed data warehouse...

Ngày tải lên: 03/07/2014, 01:20

... the extremes of normalization in a relational database. Extreme reduction in a relational database has the opposite effect to that of an object database where everything gets far to complex ... especially in a relational database. After all, a relational structure is not an object structure. Object structures become more simplistic as they are further reduced. Object database reduct...

Ngày tải lên: 03/07/2014, 01:20