We are pleased to announce the release of MySQL Cluster 8.0.25. MySQL Cluster is the distributed, shared-nothing variant of MySQL. This storage engine provides: In-Memory storage – Real-time performance (with optional checkpointing to disk) Transparent Auto-Sharding – Read & write scalability Active-Active/Multi-Master geographic replication 99.999% High Availability with no single point of failure and on-line […]

Magento is an Open-Source e-commerce platform written in PHP using multiple other PHP frameworks such as Laminas and Symphony. Magento source code is distributed under Open Software License v3.0.

Deploying Magento is not always easy as it often requires registration. However the source code is also availble on GitHub.

Magento supports MySQL 8.0 since version 2.4.0 (July 28th 2020).

In Magento’s documentation, there is a warning about GTID support:

This is not anymore a …

Well, we are almost there.

Percona Live 2021 is just around the corner and this year comes with a very “dense” agenda.  

From my side I am giving a speech that is a high-level comparison between PXC and PS with group replication as highly available solutions.

It is a bit new for me to be at such high level, given I prefer to dig into technical, but I also think it was worth to stop and have the chance better understand what gives us what.

Anyhow this blog is not about that.

Given, as said, this year we will have a very “dense” schedule, I initially look at it and get scared.

“Too much stuff!”, that was my initial thought. Then I take a breath, reserve a couple of hours of my personal time, and start to dig-in.

In general, I have to say that thanks to the fact we are having an online event with registered speech it would be easier to attend multiple tracks also …

Introduction

In my previous two blogs on this topic I first introduced the concept of automatic thread configuration and the thread model we use in RonDB. After receiving some questions on the topic I dived a bit deeper into explaining the RonDB thread model and its thread pipeline and compared it to another similar concept called batch pipelines.

Since then I read up a bit more on the research in this area with a focus on implementations in other key-value stores. Some researchers argue that a model where one handles the request immediately is superior to a model using a thread pipeline.

RonDB Software …

Now that we’ve migrated to MySQL for our core database course, I’m building MySQL Workbench analysis problems. We start with a lecture trying to flush out a simple address, and then ask them to figure out how to link it to a customer table.

Designing it, I emphasized how it resolves the issue of a city occurring in multiple counties and states, like Fremont. Fremont occurs 17 times in the US and once in Haiti:

Naturally, I left two other design issues in the problem. I’m working through it for the first time with classes tomorrow. I hope it works well. Any comments?

The new MyDumper 0.10.5 version, which includes many new features and bug fixes, is now available.  You can download the code from here.

For this release, we focused on fixing some old issues and testing old pull requests to get higher quality code. On releases 0.10.1, 0.10.3, and 0.10.5, we released the packages compiled against MySQL 5.7 libraries, but from now on, we are also compiling against MySQL 8 libraries for testing purposes, not releasing, as we think that more people in the community will start compiling against the latest version, and we should be prepared.

New Features:

• Password obfuscation #312
• Using …

The easiest way to deploy Joomla! on Oracle Cloud Infrastructure and MySQL Database Service, is to use OCI Resource Manager’s stack.

Let’s see how easy it’s to deploy such solution.

If you don’t have already an OCI account, you can get Free Tier at https://oracle.com/mysql

The easiest way to deploy all the required resources (vcn, subnets, gateways, compute and MySQL instances, security lists, …) is to use a stack for Resource Manager. It consists in Terraform modules and information to easily deploy the architecture on OCI.

To deploy Joomla! and a MDS instance, we go then on this GitHub repo and click on button to deploy on OCI:

The Oracle Cloud Dashboard will be open and the stack creation form will be loaded like …

Introduction

Sysbench is a tool to benchmark to test open source databases. We have integrated Sysbench into the RonDB installation. This makes it extremely easy to run benchmarks with RonDB. This paper will describe the use of these benchmarks in RonDB. These benchmarks were executed with 1 cluster connection per MySQL Server. This limited the scalability per MySQL Server to about 12 VCPUs. Since we executed those benchmarks we have increased the number of cluster connections per MySQL Server to 4 providing scalability to at least 32 VCPUs per MySQL Server.

As preparation to run those benchmarks we have created a RonDB cluster using the Hopsworks framework that is currently used to create …

There is a common pattern in life, you often discover or understand things by accident. Many scientific discoveries fit such a description. In our database world, I was looking to see how BLOB/TEXT columns are allocated using overlay pages and I stumbled upon something interesting and unexpected. Let me present to you my findings, along with my attempt at explaining what is happening.

InnoDB Tablespaces

The first oddity I found is a bunch of free pages in each tablespace it is skipping. Here’s an example from a simple table with only an integer primary key and a char(32) column:

root@LabPS8_1:~/1btr# innodb_space -f /var/lib/mysql/test/t1.ibd space-extents
start_page  page_used_bitmap
0               #####################################........................... <--- free pages
64              ################################################################
128 …

While I was working on my grFailOver POC, I have also done some additional parallel testing. One of them was to see how online DDL are executed inside a Group Replication cluster.

The online DDL feature provides support for instant and in-place table alterations and concurrent DML. Checking the Group Replication (GR) official documentation I was trying to identify if any limitation exists, but the only thing I have found was:

"Concurrent DDL versus DML Operations.  Concurrent data definition statements and data manipulation statements executing against the same object but on different servers is not supported when using multi-primary mode. During execution of Data Definition Language (DDL) statements on an object, executing concurrent Data Manipulation Language (DML) on the same object but on a different server instance has the risk of conflicting DDL executing on different instances not being detected."

This …