The latest from the MySQL community

In transaction processing systems we have to guarantee the transaction committed will be durable permanently. For example, In an online commerce platform, The completed transaction will remain safe even if the system crashes. This can be achieved by flushing the transactional log records to non-volatile storage devices before acknowledging the commit. MySQL guarantees maximum durability of transaction by optimally setting following system variables :

innodb_doublewrite (enabled by default) 

InnoDB stores all data twice, first to doublewrite buffer (storage area in system tablespace to write pages that are flushed from InnoDB buffer pool, before written in data file). If ever operating system / storage / mysqld process crash during the middle of page write, InnoDB can still find a durable copy of the page from doublewrite buffer for recovery. Though data is written twice,  the doublewrite buffer …

As part of my benchmarks of binary logs, I’ve decided to check how the recently released MySQL 8.0 performance is affected in similar scenarios, especially as binary logs are enabled by default. It is also interesting to check how MySQL 8.0 performs against the claimed performance improvements in redo logs subsystem.

I will use a similar setup as in my last blog with MySQL 8.0, using the utf8mb4 charset.

I have a few words about MySQL 8.0 tuning. Dimitri’s recommends in his blog posts using innodb_undo_log_truncate=off and …

I want to take a closer look at MySQL performance with binary logs enabled on different filesystems, especially as MySQL 8.0 comes with binary logs enabled by default.

As part of my benchmarks of the MyRocks storage engine, I’ve noticed an unusual variance in throughput for the InnoDB storage engine, even though we spent a lot of time making it as stable as possible in Percona Server for MySQL. In the end, the culprit was enabled binary logs. There is also always the question, “If there is a problem with EXT4, does XFS perform differently?” To answer that, I will repeat the same benchmark on the EXT4 and XFS filesystems.

You can find our previous experiments with binary logs here: …

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

The week after Percona Live Santa Clara 2018 tends to be much quieter, aided by the fact that I took a few days away during Labor Day. The next thing to look out for is Percona Live Europe 2018, which at this stage is really a note to let you save the dates: November 5-7 2018, at the Radisson Blu, in Frankfurt. There is no call for papers yet, there is no committee, and it is not listed yet at the Percona Live Conferences page. Hang in there! We’ll open the call for papers soon!

Now …

A number of reports have been raised against versions 1.2.7 and 2.0.5 where the installation/uninstallation of MySQL for Visual Studio would rollback in Windows 7 environments preventing the operation from completing. We are glad to announce this has been addressed in the upcoming 1.2.8 version.

What is causing the failure?

It’s been identified that in most cases the rollback occurs when Visual Studio fails to execute the “devenv /updateconfiguration /log” command. Said command signals Visual Studio to merge the Visual Studio packages on the system and to check the MEF cache for any changes allowing it to register/unregister MySQL for Visual Studio. The failure is caused by faulty permissions when trying to execute any “devenv” command and is attributed to a known issue in Windows 7 environments …

So, after a whirlwind few days, Percona Live 2018 has been and gone. There was a great energy about the conference, and it was fantastic to meet so many open source database enthusiasts and supporters. A few things that I experienced:

• Your great willingness to share knowledge. It was a fantastic place to learn for those who have experience from a different field of technology. Almost everyone seemed to be very open and generous with their time.
• The “superstars” from our industry are not so scary. They are as willing to be open and generous with their experience and views as any of the other attendees, and equally as interested in making new discoveries.
• There aren’t many times you can sit down to a (community) dinner, to share food and anecdotes with people from USA, UK, Germany and Armenia at the same time. I thoroughly enjoyed the company, …

Dear MySQL users,

The MySQL Windows Experience Team is proud to announce the release
of MySQL for Visual Studio 1.2.8.

This is a maintenance release for 1.2.x. It can be used for
production environments.

MySQL for Visual Studio is a product that includes all of the
Visual Studio integration functionality to create and manage
MySQL databases when developing .NET applications.

MySQL for Visual Studio is installed using the MySQL Installer
for Windows which comes in 2 versions:
* Full (386.6 MB) which includes a complete set of MySQL products
with their binaries included in the downloaded bundle.
* Web (1.7 MB – a network install) which will just pull MySQL
for Visual Studio over the web and install it when run.

You can download MySQL Installer from our official Downloads page at
…

           MySQL is the most widely used  Relational Database Management System in the open source world. MySQL stepped into the NoSQL world by introducing the JSON Data Type in MySQL 5.7 release. In this blog post I am going to explain one of the major advantage of optimisation made in JSON Replication .

This was done from the MySQL 8.0.3 release.

What happened before 8.0.3 ?

Before MySQL 8.0.3, Whatever changes (Updates) made in JSON document, it will log as a full document in binary log & replicate the same into slave. The JSON data is stored as a blob internally. Below is an example of how it is logged as full document in binary log ?

Example –

Server version - 5.7.22-log MySQL Community Server (GPL)

My Binlog settings, …

LAMP is short for Linux, Apache, MySQL, PHP. This tutorial shows how you can install an Apache 2.4 web server on an Ubuntu 18.04 (Bionic Beaver) server with PHP 7.2 support (mod_php) and MySQL / MariaDB and how to setup an SSL certificate with Let's encrypt. Additionally, I will install PHPMyAdmin to make MySQL administration easier. A LAMP setup is a perfect basis for CMS systems like Joomla, Wordpress or Drupal.

Dear MySQL users,

MySQL Connector/Net 6.9.12 is a maintenance release for the 6.9.x series
of the .NET driver for MySQL. It can be used for production
environments.

It is appropriate for use with MySQL server versions 5.5-5.7.

It is now available in source and binary form from
http://dev.mysql.com/downloads/connector/net/#downloadsandmirrorsites
(note that not all mirror sites may be up to date at this point-if you
can’t find this version on some mirror, please try again later or choose
another download site.)

Note: C/NET 6.9 will not be supported any more. If users are looking to get latest
updates on C/NET, they should upgrade to using C/NET 6.10 and 8.0 series instead.

Changes in MySQL Connector/Net 6.9.12 (2018-05-04, General
Availability)

Functionality Added or Changed

* Connections made to MySQL 8.0 (up to and including …