This is the second part of a two parts series. In MongoDB: index usage and MongoDB explain() we introduced the main index types supported by MongoDB, and how to create and use them. In this second article, we are going to see some examples on how to use explain() method to investigate queries. Do […]Read more
Please join Percona’s MySQL Database Administrator, Brad Mickel as he presents How to Analyze and Tune MySQL Queries for Better Performance on Thursday, June 21st, 2018, at 10:00 AM PDT (UTC-7) / 1:00 PM EDT (UTC-4).
Query performance is essential in making any application successful. In order to finely tune your queries you first […]
Join Percona’s Senior Architect, Matthew Boehm, as he presents What You Need to Get the Most Out of Indexes – Part 2 webinar on Thursday, October 19, 2017, at 11:00 am PDT / 2:00 pm EDT (UTC-7).
Proper indexing is key to database performance. Finely tune your query writing and database performance with tips […]Read more
In this blog, I will provide answers to the Q & A for the Troubleshooting Slow Queries webinar.
First, I want to thank you for attending the April 28 webinar. The recording and slides for the webinar are available here. Below is the list of your questions that I wasn’t able to answer during the webinar, with […]
Once again it’s time for another EXPLAIN FORMAT=JSON is cool! post. This post will discuss how EXPLAIN FORMAT=JSON allows the nested_loop command to make the JOIN operation hierarchy transparent.
EXPLAIN command lists each table that participates in a
JOIN operation on a single row. This works perfectly for simple queries:
mysql> explain select * from […]Read more