Book Image

Oracle Advanced PL/SQL Developer Professional Guide

By : Saurabh K. Gupta
Book Image

Oracle Advanced PL/SQL Developer Professional Guide

By: Saurabh K. Gupta

Overview of this book

PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's procedural extension language for SQL and the Oracle relational database. Server-side PL/SQL is stored and compiled in the Oracle Database and runs within the Oracle executable. With this guide Oracle developers can work towards accomplishing Oracle 11g Advanced PL/SQL Professional certification, which is the second milestone for developers working at the Associate level. The Oracle Advanced PL/SQL Developer Professional Guide helps you master advanced PL/SQL concepts. Besides the clear and precise explanation on advanced topics, it also contains example code and demonstrations, which gives a sense of application and usage to readers.The book gives a deep insight that will help transform readers from mid-level programmers to professional database developers. It aims to cover the advanced features of PL/SQL for designing and optimizing PL/SQL code.This book starts with an overview of PL/SQL as the programming database language and outlines the benefits and characteristics of the language. The book then covers the advanced features that include PL/SQL code writing using collections, tuning recommendations using result caching, implementing VPD to enforce row level security, and much more. Apart from programming, the book also dives deep into the usage of the development tool SQL Developer, employing best practices in database environments and safeguarding the vulnerable areas in PL/SQL code to avoid code injection.
Table of Contents (22 chapters)
Oracle Advanced PL/SQL Developer Professional Guide
Credits
Foreword
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Enabling intra unit inlining


In conventional programming terminology, the program body of an inline program is stored along with the program unit which references it. In context of Oracle subprograms, the term inlining a subprogram refers to the replacing of a subprogram call with the copy of an actual subprogram body itself. At major occasions, this activity cohesively demonstrates better performance and thus, reaps out better benefits along with modularity and call optimization.

Usually, when a program is executed, the PL/SQL engine searches for the program definition in the available objects' lists. It then validates the program, executes the body, and maintains the result in the stack frame. Later it substitutes the results in the calling program unit and proceeds for further execution. When an inline program is called from a program unit, the PL/SQL engine replaces the call statement with the copy of the program body. The copied program body works faster than the program call execution...