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Webinar Thursday March 2, 2017: MongoDB Query Patterns

 | February 27, 2017 |  Posted In: MongoDB, Technical Webinars

MongoDB Query

Join Percona’s Senior Technical Services Engineer Adamo Tonete on Thursday, March 2, 2017, at 11:00 a.m. PST / 2:00 p.m. EST (UTC-8) as he reviews and discusses MongoDB® query patterns. Register Now MongoDB is a fast and simple-to-query schema-free database. It features a smart query optimizer that tries to use the easiest data retrieval method. […]

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Percona Live Featured Tutorial with Øystein Grøvlen — How to Analyze and Tune MySQL Queries for Better Performance

 | December 29, 2016 |  Posted In: Insight for DBAs, MySQL, Percona Live

Percona Live Featured Tutorial

Welcome to another post in the series of Percona Live featured tutorial speakers blogs! In these blogs, we’ll highlight some of the tutorial speakers that will be at this year’s Percona Live conference. We’ll also discuss how these tutorials can help you improve your database environment. Make sure to read to the end to get a special Percona […]

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MySQL Query Patterns, Optimized – Webinar questions followup

 | June 3, 2013 |  Posted In: Insight for Developers, MySQL, Technical Webinars

On Friday I gave a presentation on “MySQL Query Patterns, Optimized” for Percona MySQL Webinars.  If you missed it, you can still register to view the recording and my slides. Thanks to everyone who attended, and especially to folks who asked the great questions.  I answered as many as we had time for  during the session, but here […]

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When the subselect runs faster

 | March 18, 2010 |  Posted In: Insight for Developers, MySQL

A few weeks ago, we had a query optimization request from one of our customer. The query was very simple like:

This column in the table is looks like this:

The table have 549252 rows and of course, there is an index on the col1. MySQL estimated the cardinality of that index as […]

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