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MariaDB Cookbook

You're reading from  MariaDB Cookbook

Product type Book
Published in Mar 2014
Publisher
ISBN-13 9781783284399
Pages 282 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Daniel Bartholomew Daniel Bartholomew
Profile icon Daniel Bartholomew

Table of Contents (20) Chapters

MariaDB Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Getting Started with MariaDB Diving Deep into MariaDB Optimizing and Tuning MariaDB The TokuDB Storage Engine The CONNECT Storage Engine Replication in MariaDB Replication with MariaDB Galera Cluster Performance and Usage Statistics Searching Data Using Sphinx Exploring Dynamic and Virtual Columns in MariaDB NoSQL with HandlerSocket NoSQL with the Cassandra Storage Engine MariaDB Security Index

Using SHOW EXPLAIN with running queries


The SHOW EXPLAIN feature was introduced in MariaDB 10.0. It enables us to get an EXPLAIN (that is, a description of the query plan) of the query running in a given thread.

Getting ready

Import the ISFDB database as described in the Importing the data exported by mysqldump recipe of this chapter.

How to do it...

  1. Open a terminal window and launch the mysql command-line client and connect to the isfdb database.

    mysql isfdb
    
  2. Next, we open another terminal window and launch another instance of the mysql command-line client.

  3. Run the following command in the first window:

    ALTER TABLE title_relationships DROP KEY titles;
    
  4. Next, in the first window, start the following example query:

    SELECT titles.title_id AS ID, 
           titles.title_title AS Title, 
           authors.author_legalname AS Name, 
           (SELECT COUNT(DISTINCT title_relationships.review_id) 
             FROM title_relationships
             WHERE title_relationships.title_id = titles.title_id)
      AS reviews 
    FROM...
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