Book Image

PostgreSQL Administration Cookbook, 9.5/9.6 Edition - Third Edition

Book Image

PostgreSQL Administration Cookbook, 9.5/9.6 Edition - Third Edition

Overview of this book

PostgreSQL is a powerful opensource database management system; now recognized as the expert's choice for a wide range of applications, it has an enviable reputation for performance and stability. PostgreSQL provides an integrated feature set comprising relational database features, object-relational, text search, Geographical Info Systems, analytical tools for big data and JSON/XML document management. Starting with short and simple recipes, you will soon dive into core features, such as configuration, server control, tables, and data. You will tackle a variety of problems a database administrator usually encounters, from creating tables to managing views, from improving performance to securing your database, and from using monitoring tools to using storage engines. Recipes based on important topics such as high availability, concurrency, replication, backup and recovery, as well as diagnostics and troubleshooting are also given special importance. By the end of this book, you will have all the knowledge you need to run, manage, and maintain PostgreSQL efficiently.
Table of Contents (13 chapters)

Checking which queries are running

Here we will show you how to check which query is currently running.

Getting ready

You have to make sure that you are logged in as a superuser or as the same database user you want to check. Also, ensure that the parameter track_activities = on is set (the default behavior).

This can be done either in the postgresql.conf file or by the superuser, using the following SQL statement:

SET track_activities = on

The way PostgreSQL allows a user to change configuration parameters at runtime is very powerful. You are advised to look at the reference page at http://www.postgresql.org/docs/current/static/sql-set.html.

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