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Introducing Postgresql PostgreSQL Administration Cookbook 9.5/9.6 Edition Effective database management using PostgreSQL 9.5/9.6 Simon Riggs Gianni Ciolli Gabriele Bartolini BIRMINGHAM - MUMBAI PostgreSQL Administration Cookbook 9.5/9.6 Edition Copyright © 2017 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: April 2017 Production reference: 1250417 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78588-318-7 www.packtpub.com Credits Authors Copy Editor Simon Riggs Safis Editing Gianni Ciolli Gabriele Bartolini Reviewer Project Coordinator Sheldon Strauch Shweta H Birwatkar Commissioning Editor Proofreader Amey Varangaonkar Safis Editor Acquisition Editor Indexer Ajith Menon Aishwarya Gangawane Content Development Editor Graphics Amrita Noronha Tania Dutta Technical Editor Production Coordinator Sneha Hanchate Melwyn Dsa About the Authors Simon Riggs is the CTO of 2ndQuadrant and an active PostgreSQL committer. He has contributed to PostgreSQL as a major developer for more than 12 years, having written and designed many new features in every release over that period. His feature credits include replication, performance, business intelligence, management, and security. Under his guidance, 2ndQuadrant is now a leading developer of open source PostgreSQL and a platinum sponsor of the PostgreSQL Project, serving hundreds of clients in USA, Europe, Asia-Pacific, the Middle East, and Africa. Simon is a frequent speaker at many conferences and is well known for his speeches on PostgreSQL Futures and different aspects of replication. He has worked with many different databases as a developer, architect, data analyst, and designer with companies across USA and Europe for nearly 30 years. Gianni Ciolli is the head of professional services at 2ndQuadrant. He has spoken at PostgreSQL conferences in Europe and abroad, and his other IT skills include functional languages and symbolic computing. Gianni has a PhD in mathematics, and is the author of published research on Algebraic Geometry, Theoretical Physics, and Formal Proof Theory. He previously worked at the University of Florence as a researcher and teacher. Gianni has been working on free and open source software for almost 20 years. From 2001 to 2004, he was a cofounder and the president of PLUG, short for Prato Linux User Group. He organized many sessions of the Italian PostgreSQL conference, and in 2013, he was elected to the board of ITPUG, the Italian PostgreSQL Users Group. He currently lives in London with his son. His other interests include music, drama, poetry, and sport-athletics in particular, where he competes in combined events. Gabriele Bartolini is a long-time open source programmer, now head of support at 2ndQuadrant, and an active member of the international PostgreSQL community. Gabriele has a degree in statistics from the University of Florence. His areas of expertise are data mining and data warehousing, and he has worked on web traffic analysis in Australia and Italy. He currently lives in Prato, a small but vibrant city located in the northern part of Tuscany, Italy. His second home is Melbourne, Australia, where he studied at Monash University and worked in the ICT sector. Gabriele's hobbies include playing his Fender Stratocaster electric guitar and "calcio" (football or soccer, depending on which part of the world you come from). About the Reviewer Sheldon Strauch is a 22-year veteran of software consulting at companies such as IBM, Sears, Ernst & Young, and Kraft Foods. He has a Bachelor's degree in business administration and leverages his technical skills to improve the business' self-awareness. His interests include data gathering, management, and mining; maps and mapping; business intelligence; and application of data analysis for continuous improvement. He is currently focused on development of end-to-end data management and mining at Enova International, a financial services company located in Chicago. In his spare time, he enjoys the performing arts, particularly music, and traveling with his wife, Marilyn. www.PacktPub.com For support files and downloads related to your book, please visit www.PacktPub.com. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at [email protected] for more details. At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks. h t t p s ://w w w . p a c k t p u b . c o m /m a p t Get the most in-demand software skills with Mapt. Mapt gives you full access to all Packt books and video courses, as well as industry-leading tools to help you plan your personal development and advance your career. Why subscribe? Fully searchable across every book published by Packt Copy and paste, print, and bookmark content On demand and accessible via a web browser Customer Feedback Thanks for purchasing this Packt book. At Packt, quality is at the heart of our editorial process. To help us improve, please leave us an honest review on this book's Amazon page at https://www.amazon.com/dp/1785883186. If you'd like to join our team of regular reviewers, you can e-mail us at [email protected]. We award our regular reviewers with free eBooks and videos in exchange for their valuable feedback. Help us be relentless in improving our products Table of Contents Preface 1 Chapter 1: First Steps 9 Introduction 9 Introducing PostgreSQL 9.6 9 What makes PostgreSQL different? 10 Robustness 12 Security 12 Ease of use 13 Extensibility 13 Performance and concurrency 14 Scalability 14 SQL and NoSQL 14 Popularity 15 Commercial support 15 Research and development funding 16 Getting PostgreSQL 16 How to do it... 16 How it works... 17 There's more... 17 Connecting to the PostgreSQL server 18 Getting ready 18 How to do it... 18 How it works... 19 There's more... 20 See also 21 Enabling access for network/remote users 21 How to do it... 21 How it works... 22 There's more... 24 See also 24 Using graphical administration tools 24 How to do it... 24 How it works... 27 See also 28 Using the psql query and scripting tool 28 Getting ready 29 How to do it... 29 How it works... 31 There's more... 32 See also 32 Changing your password securely 33 How to do it... 33 How it works... 33 Avoiding hardcoding your password 34 Getting ready 34 How to do it... 34 How it works... 35 There's more... 35 Using a connection service file 36 How to do it... 36 How it works... 37 Troubleshooting a failed connection 37 How to do it... 37 There's more... 39 Chapter 2: Exploring the Database 40 Introduction 40 What version is the server? 41 How to do it... 41 How it works... 41 There's more... 42 What is the server uptime? 43 How to do it... 43 How it works... 44 See also 44 Locating the database server files 44 Getting ready 44 How to do it... 45 How it works... 46 There's more... 47 Locating the database server's message log 48 Getting ready 48 How to do it... 48 How it works... 49 There's more... 50 Locating the database's system identifier 51 [ ii ] Getting ready 51 How to do it... 51 How it works... 52 Listing databases on this database server 53 How to do it... 53 How it works... 54 There's more... 55 How many tables are there in a database? 56 How to do it... 56 How it works... 58 There's more... 58 How much disk space does a database use? 59 How to do it... 59 How it works... 60 How much disk space does a table use? 60 How to do it... 60 How it works... 61 There's more... 61 Which are my biggest tables? 62 How to do it... 62 How it works... 63 How many rows are there in a table? 63 How to do it... 63 How it works... 63 Quickly estimating the number of rows in a table 64 How to do it... 65 How it works... 65 There's more... 66 Function 1 - estimating the number of rows 67 Function 2 - computing the size of a table without locks 68 Listing extensions in this database 70 Getting ready 70 How to do it... 70 How it works... 71 There's more... 71 Understanding object dependencies 71 Getting ready 72 How to do it... 72 How it works... 73 There's more... 73 [ iii ] Chapter 3: Configuration 74 Introduction 74 Reading the fine manual 75 How to do it..
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