February 2010
Intermediate to advanced
512 pages
9h 44m
English
Content preview from Oracle Database 11g PL/SQL Programming WorkbookBecome 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,
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CHAPTER 9Triggers
Triggers are an excellent part of the Oracle Database feature set. They allow you to automate processes around the enforcement of security rules, maintain data integrity in distributed systems, audit database usage, create historical data trails, prevent harmful data transactions, and generate derived column values.
Unfortunately, we see their use in scenarios that they were never intended to fulfill. For example, some database professionals use triggers to perform check constraints. While they are able to do so, Oracle Database PL/SQL Language Reference 11g specifically states that users should “not define triggers that duplicate database features.”
This chapter will discuss the following methodologies on trigger design and ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.