Essay about Dmbs Definition

993 Words Sep 14th, 2015 4 Pages
All DBMS definition files have the same structure made up of a number of categories, each of which may contain items or other categories. The items, and their values are different for each DBMS. Each item is present only if it is relevant to the DBMS. Each value is a SQL statement or other parameter to define how to model, generate and reverse engineer for the DBMS.
Each DBMS file has the following structure: * General - contains general information about the database, without any categories (see General Category). All items defined in the General category apply to all database objects. * Script - used for generation and reverse engineering. Contains the following sub-categories: * SQL - contains the following
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For more information, see Transformations and Transformation Profiles (Profile) and Core Features Guide > Linking and Synchronizing Models > Generating Models and Model Objects > Generating Models > Model Generation Options Window > Applying Model Transformations. * Profile - allows you to define extended attribute types and extended attributes for database objects. For more information, see Profile Category (DBMS). * DBMS Property Page
A DBMS has a property page available when you click the root node in the tree view. The following properties are defined: * Triggers Templates, Trigger Template Items, and Procedure Templates
The DBMS Trigger templates, Trigger template items, and Procedure templates are accessible via the tabs in the Resource Editor window. In addition, for Oracle, there is a tab for database package templates.
Heap File Organization
When a file is created using Heap File Organization, the Operating System allocates memory area to that file without any further accounting details. File records can be placed anywhere in that memory area. It is the responsibility of the software to manage the records. Heap File does not support any ordering, sequencing, or indexing on its own.

Sequential File Organization
Every file record contains a data field (attribute) to uniquely identify that record. In sequential file organization, records are

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