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PostgreSQL 9 Administration Cookbook - Second Edition
book

PostgreSQL 9 Administration Cookbook - Second Edition

by Simon Riggs, GIANNI CIOLLI, Hannu Krosing, Gabriele Bartolini
April 2015
Intermediate to advanced content levelIntermediate to advanced
504 pages
11h 41m
English
Packt Publishing
Content preview from PostgreSQL 9 Administration Cookbook - Second Edition

Usage of disk space by temporary data

In addition to ordinary stable tables, you can also create temporary tables.

Also, PostgreSQL may use temporary files for query processing if it can't fit all the necessary data into the memory.

So, how do you find out how much data is used by temporary tables and files? You can do this using any untrusted embedded language, or directly on the database host.

Getting ready

You have to use an untrusted language, because trusted languages run in a sandbox, which prohibits them from directly accessing the host filesystem.

How to do it…

Perform the following steps:

  1. First, check whether your database defines special tablespaces for temporary files, as follows:
    SELECT current_setting('temp_tablespaces');
    

    As explained later ...

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Publisher Resources

ISBN: 9781849519069Supplemental Content