You're reading from Learn PostgreSQL - Second Edition

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Published inOct 2023

PublisherPackt

ISBN-139781837635641

Edition2nd Edition

Concepts

Data Analysis

Authors (2):

Luca Ferrari

Enrico Pirozzi

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How can you inspect the plan of a query?
The special command EXPLAIN allows you to inspect how PostgreSQL is going to execute a given query, showing a “node” for each execution step. See the The EXPLAIN statement section for more details.

What is the difference between EXPLAIN and EXPLAIN EXPLAIN’?
The EXPLAIN command will not execute the query, computing only the access plan; on the other hand, the EXPLAIN ANALYZE command will execute the query and print the query plan in the output. See the EXPLAIN ANALYZE section for more details.

How does PostgreSQL keep the statistics up to date?
The statistics are updated every time a manual ANALYZE command is executed or the auto-vacuum (auto-analyze) daemon runs against a table. See the ANALYZE and how to update statistics section for more details.

How does PostgreSQL choose to use a specific access method (e.g., an index...

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Learn PostgreSQL - Second Edition

Published in: Oct 2023Publisher: PacktISBN-13: 9781837635641

Authors (2)

Luca Ferrari

Luca Ferrari has been passionate about computer science since the Commodore 64 era, and today holds a master's degree (with honors) and a Ph.D. from the University of Modena and Reggio Emilia. He has written several research papers, technical articles, and book chapters. In 2011, he was named an Adjunct Professor by Nipissing University. An avid Unix user, he is a strong advocate of open source, and in his free time, he collaborates with a few projects. He met PostgreSQL back in release 7.3; he was a founder and former president of the Italian PostgreSQL Community (ITPUG). He also talks regularly at technical conferences and events and delivers professional training.
Read more about Luca Ferrari

Enrico Pirozzi

Enrico Pirozzi, EnterpriseDB certified on implementation management and tuning, with a master's in computer science, has been a PostgreSQL DBA since 2003. Based in Italy, he has been providing database advice to clients in industries such as manufacturing and web development for 10 years. He has been training others on PostgreSQL since 2008. Dedicated to open source technology since early in his career, he is a cofounder of the PostgreSQL Italian mailing list, PostgreSQL-it, and of the PostgreSQL Italian community site, PSQL
Read more about Enrico Pirozzi

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