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HIPAA, the Sarbanes-Oxley Act, and the Gramm-Leach-Bliley Act have all produced serious constraints on Oracle professionals who are now required to produce detailed audit information for Oracle system users.
federal laws have mandated increased security for auditing Oracle user activity.
This chapter discusses triggers, which are procedures stored in PL/SQL or Java that run (fire) implicitly whenever a table or view is modified or when some user actions or database system actions occur.
This chapter contains the following topics: Triggers are similar to stored procedures.
Instead-of triggers are used when views are involved, and are a good way of avoiding the mutating table trigger-related error.
Database event triggers can be divided into two categories: on the database, where triggers occur for all users, and on a schema, where triggers occur for that user.
Also note that these user logon/logoff triggers are best used for applications that utilize time-stamped users, which means those users who are given a unique Oracle user ID when they access the application.
These system-level triggers included database startup triggers, DDL triggers, and end-user login/logoff triggers.
Well, Trigger was the name of Roy Rogers' horse, but in the Oracle world, a trigger is an important system-level component that allows you to associate a "hunk of code" (usually PL/SQL or Java) with a specific system event, namely DML (SQL insert, update and delete) statements.
See here why triggers are nor the best choice for data validation A trigger is like an IDMS user exit, an opening in the code where you can branch out and "do your own thing", prior to performing the insert, update or delete.
Data definition types of triggers can be used to capture events related to DDL statements such as create, drop, and alter. If you do not use LONG or LONG RAW data types, any restrictions concerning these are transparent to you.
Oracle places a size limit of 32KB on a trigger statement. Up to the question mark, this article used about 25KB, using around 870 words and over 4,000 characters, just to give you a rough idea of how much code you can write under 32KB. Several other restrictions and one interesting restriction has to do with the order in which triggers are fired.