Book Image

Mastering PostgreSQL 9.6

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 9.6

By: Hans-Jürgen Schönig

Overview of this book

PostgreSQL is an open source database used for handling large datasets (Big Data) and as a JSON document database. It also has applications in the software and web domains. This book will enable you to build better PostgreSQL applications and administer databases more efficiently. We begin by explaining the advanced database design concepts in PostgreSQL 9.6, along with indexing and query optimization. You will also see how to work with event triggers and perform concurrent transactions and table partitioning, along with exploring SQL and server tuning. We will walk you through implementing advanced administrative tasks such as server maintenance and monitoring, replication, recovery and high availability, and much more. You will understand the common and not-so-common troubleshooting problems and how you can overcome them. By the end of this book, you will have an expert-level command of the advanced database functionalities and will be able to implement advanced administrative tasks with PostgreSQL.
Table of Contents (14 chapters)
Free Chapter
PostgreSQL Overview

Replaying backups

Having a backup is pointless unless you have tried to actually replay it. Fortunately, it is easy to do. In case you have created a plain text backup, you can simply take the SQL file and execute it:

psql your_db < your_file.sql
A plain text backup is simply a text file containing everything. You can always simply replay a text file.

In case you have decided on a custom format or directory format, you can use pg_restore to replay the backup. pg_restore allows you to do all kinds of fancy things such as replaying just a part of a database and so on. In most cases, however, you will simply replay the entire database. In my example, I will create an empty database and just replay a custom format dump:

[hs@linuxpc backup]$ createdb new_db
[hs@linuxpc backup]$ pg_restore -d new_db -j 4 /tmp/dump.fc

Note, that pg_restore will add data to an existing database. In case your database is not empty, pg_restore...