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Questions and Answers
What are triggers in the context of database systems?
What are triggers in the context of database systems?
Triggers are rules that specify actions automatically triggered by certain events in a database system.
Which commercial relational DBMSs have had various versions of triggers available?
Which commercial relational DBMSs have had various versions of triggers available?
Oracle, DB2, and SYBASE
What will be presented in Section 23.1.1 of the text?
What will be presented in Section 23.1.1 of the text?
The general concepts proposed for specifying rules for active databases
What will be used to illustrate the concepts of specifying rules for active databases?
What will be used to illustrate the concepts of specifying rules for active databases?
What has been done since the early models of triggers were proposed?
What has been done since the early models of triggers were proposed?
Flashcards
Database Triggers
Database Triggers
Rules automatically executing actions in response to specific database events.
Commercial DBMSs with Triggers
Commercial DBMSs with Triggers
Oracle, DB2, and SYBASE have supported trigger functionality.
Section 23.1.1 Topic
Section 23.1.1 Topic
Active database rule specification concepts are described.
Example DBMS for Rules
Example DBMS for Rules
Oracle is used to illustrate active database rule specifications.
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Active Database Model
Active Database Model
A system where database actions are triggered by events.
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Trigger Functionality Evolution
Trigger Functionality Evolution
Significant research has improved trigger models.
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Oracle Trigger Syntax
Oracle Trigger Syntax
A specific set of instructions for defining triggers within Oracle.
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Active Databases
Active Databases
Databases that respond to events automatically.
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General Model of Triggers
General Model of Triggers
A broad model for defining and using triggers across databases.
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Database Rule Specification
Database Rule Specification
Defining how a database will respond to various conditions.
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Triggers in Database Systems
- Triggers are a fundamental concept in database systems, allowing for conditional actions to be performed when specific events occur.
Commercial Relational DBMSs with Triggers
- Multiple commercial relational DBMSs have offered various versions of triggers, including:
- Oracle
- DB2
- Informix
- Microsoft SQL Server
- PostgreSQL
Section 23.1.1 Overview
- Section 23.1.1 will present an overview of triggers, focusing on their role in active databases.
Illustrating Active Database Concepts
- The Starfleet example will be used to illustrate the concepts of specifying rules for active databases.
Evolution of Triggers
- Since the early models of triggers were proposed, significant advancements have been made, with ongoing development and refinement of trigger technology.
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