In this blog series, I will discuss common questions I receive as a database Solutions Engineer at Percona. In this role, I speak with a wide array of MySQL and MongoDB users responsible for both extremely large and complex environments to smaller single-server environments. Typically we are contacted when the customer is about to embark on an architecture migration or redesign, or they have performance issues in their production environment. The purpose of this blog is to put together a list of common questions I field while speaking with active MySQL and MongoDB users.

We are considering a migration to AWS. What solution is right for us: EC2, RDS, or Aurora?

We get this question a lot. Moving to AWS is a hot trend. Fellow Solution Engineer Rick Golba wrote …

MySQL is well known and widely spread because of its philosophy of Keep it Simple (KISS).

We recently had the discussion that with newer releases also MySQL and MariaDB relational databases becomes more and more complicated.

One indication for this trend is the number of MySQL server system variables and status variables.

In the following tables and graphs we compare the different releases since MySQL version 4.0:

mysql> SHOW GLOBAL VARIABLES;
mysql> SHOW GLOBAL VARIABLES LIKE 'innodb%';
mysql> SHOW GLOBAL STATUS;
mysql> SHOW GLOBAL STATUS LIKE 'innodb%';

I have chatting with others who want to use the new X Devapi Document Store features but have not been able to find simple example programs. Finding the bridge between 'Hello World' and something useful can often be discouraging.

Example Code Here is a very short Node.JS Docstore example program that accesses the 'countryinfo' collection. More on why Node.JS and what software you need below. But for now regard this code to get one specific record from the database.

var mysqlx = require('@mysql/xdevapi');

mysqlx.getSession({             //Auth to server
        host: 'localhost',
        port: '33060',
        dbUser: 'root',
        dbPassword: 'password'
}).then(function (session) {    // use world_x.country.info
     var schema = session.getSchema('world_x');
     var collection = schema.getCollection('countryinfo');

collection                      // Get row for 'CAN'
 …

It’s a wonderful news, we have released MySQL 5.7.17 with Group Replication Plugin (GA quality).

From the definition, Group Replication is a multi-master update everywhere replication plugin for MySQL with built-in conflict detection and resolution, automatic distributed recovery, and group membership.

So we can indeed compare this solution with Galera from Codership which is a Replication Plugin implementing the WSREP API. WSREP, Write Set Replication,  extends the replication API to provide all the information and hooks required for true multi-master, “virtually synchronous” replication.

With Group Replication, MySQL implemented all this information …

Great news: Group Replication is now officially released with MySQL 5.7.17, congratulations to everybody that worked so hard for it!

In this post I plan to share more details about the performance of Group Replication while addressing one of our frequently asked questions, which is how it performs compared to Galera.…

MySQL Server 5.7.17, 5.6.35, and 5.5.54, new versions of the popular Open Source Database Management System, have been released. These releases are recommended for use on production systems. For an overview of what’s new, please see http://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html http://dev.mysql.com/doc/refman/5.6/en/mysql-nutshell.html http://dev.mysql.com/doc/refman/5.5/en/mysql-nutshell.html For information on installing the release on new servers, please see the MySQL installation documentation at […]

Extremely exciting news! A big day today. In case you have missed it, MySQL Group Replication has made it into the MySQL 5.7.17 release. Thus, it is now GA.

The MySQL Group Replication feature is a multi-master update anywhere replication plugin  for MySQL with built-in conflict detection and resolution, automatic distributed recovery, and group membership.…

Travis-CI is a crucial component in Continuous Integration/Continuous Deployment. We use it a lot to run unit tests and building/uploading Python modules. Recently I had to solve a problem of building RPMs on Travis-CI with Docker containers. In this post I will describe step-by-step how to do that. We distribute our backup tool as RPM packages […]

The post Building RPM on Travis-CI in Docker containers appeared first on TwinDB.

This tutorial shows how to read information from MySQL Sakila database in an ASP.NET Core application using Connector/NET Core to explore the possibility to run this application on any .NET Core supported environment as Windows, Linux, and Mac.

Pre-requisites:

• MySQL Server 5.7
• .NET Core 1.1 environment installed
  https://www.microsoft.com/net/core
• Visual Studio 2015 or Visual Studio Code
• Sakila sample database
  http://dev.mysql.com/doc/sakila/en/sakila-installation.html

Windows and Visual Studio 2015

The first step is to create an ASP.NET Core Web Application (.NET Core) type project and name it MvcSakilaCore

Note: the …

MySQL Connector/Net 6.10.0 alpha is the first release to provide Entity
Framework Core 1.1 support and to enable compression in the .NET Core
version of the driver for enhanced cross-platform application
development.To download MySQL Connector/Net 6.10.0 alpha, see the “Development
Releases” tab at http://dev.mysql.com/downloads/connector/net/

Note

Known limitation of this release: DbContext within an application can emit an unhandled exception. Due to this limitation,

MySQL Connector/Net 6.9.9 is the preferred version to use with EF6.

Functionality Added or Changed

• Support for compression was extended to the .NET Core version of the driver.
• Added support for Entity Framework (EF) Core 1.1.

Nuget …