Skip to Main Content
Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

Triggers

A trigger is a program that executes in response to a change in table data or to certain events that occur in the database. There is a predefined set of events that can be “hooked” with a trigger, enabling you to integrate your own processing with that of the database. A triggering event fires, or executes, the trigger.

Triggers are enabled on creation (via a CREATE TRIGGER statement) and can be disabled (so they do not fire) via an ALTER TRIGGER or ALTER TABLE statement:

ALTER TRIGGER trigger_name {ENABLE | DISABLE};

ALTER TABLE table_name {ENABLE | DISABLE} ALL 
   TRIGGERS;

Triggers cannot be created on SYS-owned objects.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Oracle Internals

Oracle Internals

Donald K. Burleson
Oracle PL/SQL

Oracle PL/SQL

Lewis Cunningham
Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition

Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition

Rick Greenwald, Robert Stackowiak, Jonathan Stern

Publisher Resources

ISBN: 0596003366Errata Page