The Percona Managed Services team recently faced a somewhat peculiar client issue. We’d receive pages about their MySQL service being unreachable. However, studying the logs showed nothing out of the ordinary…. for the most part it appeared to be a normal shutdown and there was nothing in anyone’s command history nor a cron task to speak of that was suspicious.

This is one of those obscure and peculiar (read: unique) issues that triggered an old memory; I’d seen this behavior before and I had just the tool to catch the culprit in the act.

Systemtap made diagnostics of this issue possible and I can’t state enough how much of a powerful and often under-utilized tool set systemtap really is.

cat >

This week we continue our series on Common Schema and talk about different ways to look at the processlist, help with the query profiler, and some internal Common Schema tables. Ear Candy is about RHEL 7.0 using MariaDB, and At the Movies is The Human Postmortem.

This week we continue our discussion about Common Schema by talking about security views and schema analysis views. Ear Candy is that apt repositories for MySQL are available, and At the Movies is about copyright vs. civil liberties.

On Wednesday I gave a presentation on “How to Avoid Even More Common (but Deadly) MySQL Development Mistakes” 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

The Brainiac Corner is a format where we talk with some of the smartest minds in the system, database, devops, and IT world. If you have opinions on pirates, or anything else related, please don't hesitate to contact us. 

Today, we interview Jeremy Tinley, the current Database Administrator at Etsy. He is a huge fan of puns and jokes. His favorite today is "A DBA walks into a bar and sees two tables. He says 'Can I join you?'" He gets randomly preselected for TSA precheck lines more than anyone else he knows. If you are interested in his thoughts, connect through Twitter.

How did you get from

This is the second part of my series on High Availability with mysqlnd_ms. In my first post, “Simple MySQL Master HA with mysqlnd_ms,” I showed a simple HA solution using asynchronous MySQL replication. This time we will see how to leverage an all-primary cluster where you can write to all nodes. In this post I used Percona XtraDB Cluster, but you should also be able to do the same with MySQL NDB Cluster or Tungsten Replicator.

To start with, here is the mysqlnd_ms configuration I used:

mysqlnd_ms_mm.ini

Install Apache2, PHP5 And MySQL Support On CentOS 7 (LAMP)

This tutorial shows how you can install an Apache2 webserver on a CentOS 7.0 server with PHP5 support (mod_php) and MySQL support. LAMP is short for Linux, Apache, MySQL, PHP.

In my recent post, “TokuDB gotchas: slow INFORMATION_SCHEMA TABLES,” I saw a couple questions and tweets asking if we use TokuDB in production. Actually I mentioned it in that post and we also blogged about it in a couple of other recent posts:

• Getting to know TokuDB for MySQL
• Percona Server with TokuDB: Packing 15TB into local SSDs

So, yes, we are using Percona Server + TokuDB as a main storage engine in Percona Cloud Tools to store timeseries data.

And, yes, Percona

This week we continue our discussion of Common Schema by finishing up the routines and starting to look at the views it offers. Ear Candy is and At The Movies is

News
In the news, the OurSQL podcast will change to a monthly format after episode 200. We love doing the podcast, but it is very time consuming and production is expensive. We will still bring quality episodes, they will just be spaced further apart.

This week we start talking about common schema by Shlomi Noach. Ear Candy is some caveats about GTIDs and replication, and At the Movies is using jQuery, AJAX and PHP to insert data into MySQL.

News
In the news, the OurSQL podcast will change to a monthly format after episode 200. We love doing the podcast, but it is very time consuming and production is expensive. We will still bring quality episodes, they will just be spaced further apart.

This week we discuss pt-sift and pt-stalk. Ear Candy is about a new tool called Orchestrator, and At the Movies is about Trove on OpenStack to provide open source Database as a Service.

News
Gerry:
In the news, the OurSQL podcast will change to a monthly format after episode 200. We love doing the podcast, but it is very time consuming and production is expensive. We will still bring quality episodes, they will just be spaced further apart.

This week we discuss advanced pt-table-sync, including bidirectional sync. Ear Candy is starting MySQL on low-memory virtual machines, and At the Movies is "What's New With MySQL and MariaDB?"

pt-table-sync
Episode 188, where we talked about pt-table-sync basics
pt-table-sync documentation

This week we discuss pt-table-sync basics. Ear Candy is about how MyISAM can seem transaction-aware, and At the Movies is MySQL and NoSQL at Craigslist.

Events
DB Hangops - every other Wednesay at noon Pacific time
Upcoming SkySQL events
Upcoming MySQL events (http://www.mysql.com/news-and-events/events/)

This week, we discuss DB Hangops with special guest, Geoffrey Anderson. Ear Candy is that GTIDs in MariaDB and MySQL are different, and At the Movies is Jonathan Levin talking about deduplicating your data with MySQL.

DB Hangops
DB Hangops - blog and videos of previous hangouts
YouTube DB Hangops channel
DB Hangops twitter account

This week we talk with former co-host Sarah Novotny about Data at OSCon. Ear Candy is about SQL Courses, and At the Movies is a two and a half hour tutorial about MySQL Scaling Strategies for Developers.

Events
DB Hangops - every other Wednesay at noon Pacific time

Upcoming MySQL events (http://www.mysql.com/news-and-events/events/)

This week we discuss pt-table-checksum for keeping data in sync. Ear Candy is a rational look at why one company chose MySQL; At the Movies is using MySQL in a practical way for Big Data.

pt-table-checksum
pt-table-checksum
pt-table-sync

This week we discuss more Percona tools: pt-online-schema-change and pt-slave-find. Ear Candy is using the CONNECT storage engine to read GPX files, and At the Movies is Performance at Scale with TokuDB.

Events
DB Hangops - every other Wednesay at noon Pacific time

Upcoming MySQL events