Overview The Skinny

From time to time we are asked how to check whether or not there are data discrepancies between Master/Slave nodes within a MySQL (or MariaDB) cluster that’s managed with Tungsten Clustering. This is always a challenging task, not least because we hope and believe that our replication mechanism would avoid such occurrences, that said there can be factors outside of our control that can appear to “corrupt” data – such as inadvertent execution of DML against a slave using a root level user account.

Tungsten Replicator, the core replication component in our Tungsten Clustering solution for MySQL (& MariaDB), is just that, a replicator – it takes transactions from the binary logs and replicates them around. The replicator isn’t a data synchronisation tool in that respect, the …

(In the previous post, Part 2, we covered Initial Data Flushing.)

In this blog post, we continue our series of exploring MyRocks mechanics by looking at the configurable server variables and column family options. In our last post, I explained at a high level how data moves from immutable memtables to disk. In this post, we’re going to talk about what happens to that data as it moves through the compaction process.

What is Compaction?

One of the philosophies of MyRocks is “write the data quickly and sort out data organization later”, which is pretty far removed from engines like InnoDB that take the approach of “continuously organize data on disk so it’s optimal as soon as possible”. MyRocks implements its philosophy in a way that is heavily reliant on a process …

(In the previous post, Part 1, we covered Data Writing.)

In this blog post, we continue on our series of exploring MyRocks mechanics by looking at configurable server variables and column family options. In our last post, I explained at a high level how data first entered memory space and in this post, we’re going to pick up where we left off and talk about how the flush from immutable memtable to disk occurs. We’re also going to talk about how newly created secondary indexes on existing tables get written to disk.

We already know from our previous post in the series that a flush can be prompted by one of several events, the most common of which would be when an active memtable is filled to its maximum capacity and is rotated into immutable status.

When your immutable memtable(s) is ready …

Series Introduction

Back in 2016 I decided to write a blog series on InnoDB in hopes that it would help give a good description of the high level mechanics of the storage engine. The main motivating factor at that time was that I knew there was a lot of information out there about InnoDB, but a lot of it was ambiguous or even contradictory and I wanted to help make things a bit clearer if I could.

Now there’s a new storage engine that’s rising in popularity that I feel needs similar attention. Specifically MyRocks, the log-structured merge-driven RocksDB engine in MySQL. Given the amount of discussion in the community about MyRocks, I’m sure most of you already have some degree of familiarity, or at the very least have heard the name.

Now we’ve arrived at a point where this is no longer just a Facebook integration project and major players in the community like Maria and Percona have their own implemented …

We’re pleased to share our webinar “Multi-Region AWS Aurora vs Continuent Tungsten for MySQL & MariaDB”, recorded live on Thursday, April 18th, 2019.

Our colleague Matt Lang walks you through a comparison of building a global, multi-region MySQL / MariaDB / Percona cloud back-end using AWS Aurora versus Continuent Tungsten.

If you’d like to find out how multi-region AWS Aurora deployments can be improved – then this webinar is for you!

We hope you enjoy it!

Recorded:

Thursday, April 18th at 10am PST / 1pm EST / 4pm BST / 5pm CEST

Recording: follow this link to watch

Slides: …

This was not on the radar. I have never been proficient in Galera clusters and related technologies, and thus I hadn’t given much thought to Percona Xtradb Cluster (PXC), until Alkin approached me at FOSDEM, and proposed to extend dbdeployer features to support PXC. He mentioned that many support engineers at Percona use dbdeployer) on a daily basis and that the addition of PXC would be welcome.

I could not follow up …

If you have not purchased your ticket yet for this years FOSDEM MySQL, MariaDB and Friends Community Dinner, hurry! We’ve already sold 2/3 of our tickets since launching tickets sales last week.

The dinner takes place in the same location, on the same day as the  pre-FOSDEM MySQL Day 2019.

Buy your tickets on Eventbrite:  https://www.eventbrite.com/e/fosdem-mysql-and-friends-community-dinner-2019-tickets-54494889682

We’re looking forward to meeting you all again at Fosdem and the Community Dinner. See you then! Party-Squad – Kenny Gryp,  …

We have sent requests and also received candidatures for the MySQL, MariaDB & Friends Devroom Committee. Now we are happy to announce you the name of the people who will rate your submissions:

• Daniël van Eeden (for the Community)
• Art van Scheppingen (for the Community)
• Giuseppe Maxia (for the Community)
• Aurélien Lequoy (for the Community)
• Tom de Cooman (for Percona)
• …

Good news ! The MySQL, MariaDB & Friends Devroom has been accepted for FOSDEM’19 ‘s edition as announced earlier!

This event is a real success story for the MySQL ecosystem; the content, the speakers and the attendees are growing every year.

The first big change for this 2019 edition is that the MariaDB Foundation (Ian) is joining my efforts to build this Devroom. Don’t forget that FOSDEM takes place in Belgium, and our motto is “l’Union fait la Force” [“Unity is Strength”].

FOSDEM …

The FOSDEM organization just confirmed that again this year the ecosystem of your favorite database will have its Devroom !

More info to come soon, but save the day: 2 & 3rd February 2019 in Brussels !

It seems the MySQL & Friends Devroom  (MariaDB, Percona, Oracle, and all tools in the ecosystem) will be held on Saturday (to be confirmed).

Stay tuned !