We are happy to confirm that we are ready for another two shows which will take place this week. One in the US second in Europe. Please find details below:

• PHP[World]

  • Place: Washington DC, US
  • Date: November 14-15, 2018
  • MySQL Community team is a Workshop sponsor here with David Stokes, the MySQL Community Manager as MySQL representative on site. 
• BGOUG
  • Place: Pravets, Bulgaria
  • Date: November 16, 2018
  • MySQL sponsors & attends this show for years. This year Georgi Kodinov, the Senior Software Developer Manager for MySQL will have a talk on "Data Masking in MySQL Enterprise 5.7 and 8". …

We are happy to announce that this Thursday, November 15 at 7:00 p.m., there will be a MySQL meetup in Madrid, Spain. Please find more details below:  

• Date: Nov 15, 2018
• Time: 7:00-9:00pm
• Place: booking.com @ Torre Europa Paseo de la Castellana 95, Planta 11 · Madrid
• Agenda:
  • Morgan Tocker: "TiDB: Distributed, horizontally scalable, MySQL compatible”
  • Simon Mudd: "Vitess and MySQL Cluster" More information & registration can be found on the Meetup website: https://www.meetup.com/Madrid-MySQL-users-group/events/255291731/  

Do not forget to register on the page if you are coming.

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)
• …

JSON has proven to be a very import data format with immense popularity. A good part of my time for the last two or so years has been dedicated to this area and I even wrote a book on the subject.  This is a comparison of the implementations of handling JSON data in MySQL and MariaDB. I had requests from the community and customers for this evaluation.


JSON Data Types Are Not All Equal
MySQL added a JSON data type in version 5.7 and it has proven to be very popular.  MariaDB has  JSON support  version 10.0.16 but is actually an alias to a longtext data type so that statement based replication from MySQL to MariaDB is possible.

MySQL stores  JSON documents are …

Somebody on Freenode wanted this:

   Source            Result
+----+------+    +----+------+
| id | x    |    | id | c    |
+----+------+    +----+------+
|  1 |    1 |    |  1 |    2 |
|  2 |    1 |    |  2 |    2 |
|  3 | NULL |    |  3 | NULL |
|  4 | NULL | -> |  4 | NULL |
|  5 |    1 |    |  5 |    1 |
|  6 | NULL |    |  6 | NULL |
|  7 |    1 |    |  7 |    3 |
|  9 |    1 |    |  9 |    3 |
| 10 |    1 |    | 10 |    3 |
+----+------+    +----+------+

The result uses the NULL values in x as boundaries of windows, and counts the number of rows within each window. I don’t know why anyone wants such a thing; it is not ours to reason why…

Anyway, the point is that you can use arbitrary expressions, even subqueries, to define your window partitions.

SELECT 
    id, 
    -- Count of rows in windows bound by NULL values in x
    IF(
      x IS NULL, 
      NULL, 
      COUNT(*) OVER (PARTITION BY (
        -- …

As promised, here are slides about MySQL 8.0 Performance from my talks at Oracle Open World 2018 and Percona LIVE Europe 2018 -- all is combined into a single PDF file to give you an overall summary about what we already completed, where we're going in the next updates within our "continuous release", and what kind of performance issues we're digging right now.. ;-))
Also, I'd like to say that both Conferences were simply awesome, and it's great to see a constantly growing level of skills of all MySQL Users attending these Conferences ! -- hope you'll have even more fun with MySQL 8.0 now ;-))

Welcome to Wednesday at Percona Live Europe 2018! Today is the final day! Check out all of the excellent sessions to attend.

Please see the important updates below.

Download the conference App

If you haven’t already downloaded the app, go to the app store and download the official Percona Live App! You can view the schedule, be alerted for any important updates, create your own personalized schedule, rate the talks and interact with fellow attendees.

For Apple: Download here
For Android:  …

Common Table Expressions (CTEs) are a very useful tool and frankly a big improvement on sub-queries.  But there are differences in how they are implemented in MySQL and MariaDB.  That  is not too surprising since the code fork many years ago. Different engineers implementing the same idea will have different approaches (and sometimes results). But differences in implementation are often important and, in this case, shockingly different.

Jesper Wisborg Krogh at Oracle OpenWorld and CodeOne gave a series of presentations and hands on labs that were excellent. He is an amazing Support Engineer and a great presenter of material at conferences.  In the lab for Common Table Expressions he did point out to me an interesting problem in MariaDB's implementation of CTEs. 

The Problem In a Nutshell
On the PostgreSQL Wiki, there is a
an SQL query (requires PostgreSQL 8.4 or MySQL 8.0) that …

Hello, open source database enthusiasts at Percona Live Europe 2018! There is a lot to see and do today, and we’ve got some of the highlights listed below.

On Facebook? Go here for some pics that captured the action on Percona Live Europe 2018 Tutorials day (Monday, Nov. 5, 2018). 

Download the Conference App

We apologize for the confusion yesterday on the app but can assure you, the schedule and timings have been updated! If you haven’t already downloaded the app, go to the app store and download the official Percona Live App! You can view the schedule, be alerted for any …

Quickly Add a Node to an InnoDB Cluster or Group Replication (Shutterstock)

In this blog, we’ll look at how to quickly add a node to an InnoDB Cluster or Group Replication using Percona XtraBackup.

Adding nodes to a Group Replication cluster can be easy (documented here), but it only works if the existing nodes have retained all the binary logs since the creation of the cluster. Obviously, this is possible if you create a new cluster from scratch. The nodes rotate old logs after some time, however. Technically, if the

gtid_purged

 set is non-empty, it means you will need another method to add a new node to a cluster. You also …