Book Image

PostgreSQL Development Essentials

By : Manpreet Kaur, Baji Shaik
Book Image

PostgreSQL Development Essentials

By: Manpreet Kaur, Baji Shaik

Overview of this book

PostgreSQL is the most advanced open source database in the world. It is easy to install, configure, and maintain by following the documentation; however, it’s difficult to develop applications using programming languages and design databases accordingly. This book is what you need to get the most out of PostgreSQL You will begin with advanced SQL topics such as views, materialized views, and cursors, and learn about performing data type conversions. You will then perform trigger operations and use trigger functions in PostgreSQL. Next we walk through data modeling, normalization concepts, and the effect of transactions and locking on the database. The next half of the book covers the types of indexes, constrains, and the concepts of table partitioning, as well as the different mechanisms and approaches available to write efficient queries or code. Later, we explore PostgreSQL Extensions and Large Object Support in PostgreSQL. Finally, you will perform database operations in PostgreSQL using PHP and Java. By the end of this book, you will have mastered all the aspects of PostgreSQL development. You will be able to build efficient enterprise-grade applications with PostgreSQL by making use of these concepts
Table of Contents (17 chapters)
PostgreSQL Development Essentials
About the Authors
About the Reviewers

Chapter 5. Transactions and Locking

So far in this book, we have discussed basic and advanced concepts of PostgreSQL and a few database designing concepts. In this chapter, we will discuss multiuser aspects of PostgreSQL. In the real world, an application being accessed by multiple users at the same time is very generic and it becomes important that we understand these concepts. We will look at two important concepts of database support for multiple users: transactions and locking.

Transaction means a combination of different changes made to the database in a single unit. And when we talk about multiuser environment, which means that multiple users are trying to access the database at the same time, it's very important that multiple transactions are not impacting each other. So, we will discuss the challenges that we face in multiuser environments and different levels of isolation, which is required to control the concurrency. Additionally, we will discuss the different techniques of locking...