Beginning Database Design- P9 ppt

... Brown’); COMMIT; TRAP ERROR ROLLBACK; END; Changing Database Metadata Database objects such as tables define how data is stored in a database; therefore, database objects are known as metadata, which ... Publishing Group 41 Gavin Powell Changing Data in a Database Changes to a database can be performed using the INSERT, UPDATE, and DELETE commands. Some database have variations o...

Ngày tải lên: 03/07/2014, 01:20

... various database engines, pictured how stored procedures should be used. Some database engines essentially allow anything, and some database engines deliber- ately restrict what can be coded in a database ... the Database Code can be stored in a database in the form of modular scripted sections. These scripts can be com- pletely independent of anything in the database, or can ope...

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

... certifi ed graphics card. Details can be found on the web page AutoCAD Certifi ed Hardware XML Database . Fig. 21.7 Second example – multileaders Please purchase PDF Split-Merge on www.verypdf.com

Ngày tải lên: 21/01/2014, 23:20

... 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

... 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

... 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

... 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

... 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