You're reading from Mastering PostgreSQL 15 - Fifth Edition

Product typeBook

Published inJan 2023

PublisherPackt

ISBN-139781803248349

Edition5th Edition

Concepts

Robotic Process Automation

Author (1)

Hans-Jürgen Schönig

Checking for memory and I/O

Once we have found missing indexes, we can inspect the memory and I/O. To figure out what is going on, it makes sense to activate track_io_timing. If it is on, PostgreSQL will collect information about the disk wait time and present it to you.

Often, the main question asked by a customer is: if we add more disks, will it be faster? It is possible to guess what will happen, but in general, measuring is the better and more useful strategy. Enabling track_io_timing will help you gather the data to really figure this out.

PostgreSQL exposes the disk wait time in various ways. One way to inspect things is to take a look at pg_stat_database:

test=# \d pg_stat_database
    View "pg_catalog.pg_stat_database"
Column          | Type                     | Modifiers
--------...

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Mastering PostgreSQL 15 - Fifth Edition

Published in: Jan 2023Publisher: PacktISBN-13: 9781803248349

Author (1)

Hans-Jürgen Schönig

Hans-Jürgen Schönig has 20 years' experience with PostgreSQL. He is the CEO of a PostgreSQL consulting and support company called CYBERTEC PostgreSQL International GmbH. It has successfully served countless customers around the globe. Before founding CYBERTEC PostgreSQL International GmbH in 2000, he worked as a database developer at a private research company that focused on the Austrian labor market, where he primarily worked on data mining and forecast models. He has also written several books about PostgreSQL.
Read more about Hans-Jürgen Schönig

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Checking for memory and I/O

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