Book Image

Mastering PostgreSQL 10

Book Image

Mastering PostgreSQL 10

Overview of this book

PostgreSQL is an open source database used for handling large datasets (big data) and as a JSON document database. This book highlights the newly introduced features in PostgreSQL 10, and shows you how you can build better PostgreSQL applications, and administer your PostgreSQL database more efficiently. We begin by explaining advanced database design concepts in PostgreSQL 10, 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, high availability, and much more. You will understand 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 advanced database functionalities and will be able to implement advanced administrative tasks with PostgreSQL 10.
Table of Contents (15 chapters)

Checking for missing indexes

Once you are done with the first three steps, it is important to take a look at performance in general. As I keep stating throughout this book, missing indexes are super responsible for super bad performance. So, whenever you are facing a slow system, is it recommended that you check for missing indexes and deploy whatever is needed.

Usually customers ask you to optimize the RAID level, tune the kernel, or some other fancy stuff. In reality, those complicated requests often boil down to a handful of missing indexes. By my judgment, it always makes sense to spend some extra time on just checking whether all desired indexes are there. Checking for missing indexes is neither hard nor time-consuming, so it should be done all the time regardless of the kind of performance problem you are facing.

Here is my favorite query to get an impression of where an...