October 2014
Intermediate to advanced
142 pages
3h 9m
English
Content preview from PostgreSQL Administration EssentialsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Detecting slow queries
Now that we have seen how to hunt down tables that might need an index, we can move on to the next example and try to figure out the queries that cause most of the load on your system. Sometimes, the slowest query is not the one causing a problem; it is a bunch of small queries, which are executed over and over again. In this section, you will learn how to track down such queries.
To track down slow operations, we can rely on a module called pg_stat_statements. This module is available as part of the PostgreSQL contrib section. Installing a module from this section is really easy. Connect to PostgreSQL as a superuser, and execute the following instruction (if contrib packages have been installed):
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