A few weeks ago I started experimenting with MySQL InnoDB cluster. As part of the testing, I tried to kill a node to see what happens to the cluster.

The good news is that the cluster is resilient. When the primary node goes missing, the cluster replaces it immediately, and operations continue. This is one of the features of an High Availability system, but this feature alone does not define the usefulness or the robustness of the system. In one of my previous jobs, I worked at testing a commercial HA system and I've learned a few things about what makes a reliable system.

Armed with this knowledge, I did some more experiments with InnoDB Cluster. The attempt from my previous article had no other expectation than seeing operations continue with ease (primary node …

Percona announces the GA release of Percona Server for MySQL 5.7.18-15 on May 26, 2017. Download the latest version from the Percona web site or the Percona Software Repositories. You can also run Docker containers from the images in the Docker Hub repository.

Based on MySQL 5.7.18, including all the bug fixes in it, Percona Server for MySQL 5.7.18-15 is the current GA release in the Percona Server for MySQL 5.7 series. Percona’s …

In this blog post, we’ll look at how ProxySQL and mirroring go together.

Overview

Let me be clear: I love ProxySQL, and I think it is a great component for expanding architecture flexibility and high availability. But not all that shines is gold! In this post, I want to correctly set some expectations, and avoid selling carbon for gold (carbon has it’s own uses, while gold has others).

First of all, we need to cover the basics of how ProxySQL manages traffic dispatch (I don’t want to call it mirroring, and I’ll explain further below).

ProxySQL receives a connection from the application, and through it we can have a simple SELECT or a more complex transaction. ProxySQL gets each query, passes them to the Query Processor, processes them, identifies if a query is mirrored, duplicates the whole MySQL session ProxySQL internal object and associates it to a mirror queue (which refer to a …

Dear MySQL users,

The MySQL Windows Experience Team is proud to announce the release of MySQL for Excel version 1.3.7. This is a maintenance release for 1.3.x. It can be used for production environments.

MySQL for Excel is an application plug-in enabling data analysts to very easily access and manipulate MySQL data within Microsoft Excel. It enables you to directly work with a MySQL database from within Microsoft Excel so you can easily do tasks such as:

• Importing MySQL data into Excel
• Exporting Excel data directly into MySQL to a new or existing table
• Editing MySQL data directly within Excel

MySQL for Excel is installed using the MySQL Installer for Windows.The …

I used to work for a company specializing in Geographical Information Systems, and I still get excited about using computers to interact with geospatial data. Once a field that interested only geography geeks, GIS has now become mainstream, with just about every mobile app offering some kind of location awareness.

Whereas many such applications use some kind of third-party API to work with spatial data, with MySQL you can do this right in the database itself. MySQL provides a number of spatial data types which let you create and store simple geometric shapes like points, lines, and polygons that represent features like cities, roads, and countries respectively, together with their location in the real world.

Once you have created these geographical features in the database, you can use MySQL to understand the relationship between them. For example, many applications provide a "find my nearest..." capability, to locate things you …

mysqldump is a very handy utility which can be useful if you work with MySQL databases ,you'll often need to backup your databases and restore them or import them back .

The mysqldump utility produces a set of SQL statements when executed against a database will create the same table structure and table rows or data.

mysqldump is fairly easy to use ,you can use it from the command line with different commands and options to tackle different use cases.

Lets see some practical examples to backup your databases with mysqldump :

Say you have a set of mySql databases ,you can backup them all with one command mysqldump --all-databases --user=root --password > backup-all-databases.sql

This will create backup-all-databases.sql file in your current directory which has a dump for all databases .

All the options are self explanatory --user and --password are for specifying mySql username and password …

JSON Data Into MySQLJSON is now a very hot format for sharing data and MySQL's 5.7 Data Set is now a very hot way of storing that data. But I have had some requests on getting a raw JSON data set into MySQL. So lets start with Global Airfields data from the Awesome JSON Datasets collection. airfields.jsonThe data is in a file named airfields.json and comes as one very long line. MySQl has now way of taking out the individual JSON documents from that string and putting them in a row. The jq tool will let use see the data broken down into objects. Try jq -C '.[]' airfields.json and you will see individual documents colorized.

{
  "ID": "LFOI",
  "ShortName": "ABBEV",
  "Name": …

This blog post is a summary of the Percona Software and Roadmap Update – Q2 2017 webinar given by Peter Zaitsev on May 4, 2017. This webinar reflects changes and updates since the last update (Q1 2017).

A full recording of this webinar, along with the presentation slide deck, can be found here.

Percona Software

Below are the latest and upcoming features in Percona’s software. All of Percona’s software is 100% free and open source, with no …

In this post, we’ll see how to make Docker images available to servers that don’t have access to the Internet (i.e., machines where docker pull <image_name> does not work).

As a specific example, we will do this with the latest Percona Monitoring and Management Docker images, since we had requests for this from users and customers. With the following steps, you’ll be able to deploy PMM within your secure network, without access to the Internet. Additionally, the same steps can be used when you need to upgrade the containers’ version in future releases.

There are two ways in which we can do this:

CTEs and Recursive CTEs appeared in MySQL 8.0; first in a Labs release and now in the official release 8.0.1. Several blogs have been published: here, here and here ; my colleague Øystein also wrote about how using a CTE made one DBT3 query run twice faster.…