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DDL Queries on Foreign Key Columns in MySQL/PXC
Recently, I received a support request where the customer wanted to convert an INTEGER column to BIGINT on two tables. These tables are related by a foreign key, and it is a 3 node PXC cluster. These...
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SQL ORDER BY CLAUSE Example | SQL Order By Tutorial
SQL ORDER BY CLAUSE Example | SQL Order By Tutorial is today’s topic. An ORDER BY keyword is used to sort the result in ascending or descending order. An ORDER BY keyword sorts the records in...
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SQL UNION Operator Tutorial With Example | Union Clause in SQL
SQL UNION Operator Tutorial With Example | Union Clause in SQL is today’s topic. SQL UNION operator is used to combine a result sets of 2 or more SELECT statements. It removes the duplicate rows...
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The Continuent Docker Support Policy Explained
Overview Continuent has traditionally had a relaxed policy about Linux platform support for customers using our products. While it is possible to install and run Continuent Tungsten products (i.e....
View ArticleMySQL 8.0.16 New Features Summary
Presentation of some of the new features of MySQL 8.0.16 released on April 25, 2019
View ArticlePerl & MySQL 8.0
If you just migrated to MySQL 8.0, you may have seen that the default authentication plugin has been changed to a more secure one: caching_sha2_password and I’ve already written some articles about...
View ArticleMySQL stored procedures: all ways to produce an output
There are many non-obvious ways to return values from MySQL stored procedures, and each of them solves particular problems. The post MySQL stored procedures: all ways to produce an output appeared...
View ArticleInstallation and configuration of 3 node MariaDB Galera Cluster and MariaDB...
Step-by-step installation and configuration of 3 node MariaDB Galera Cluster and MariaDB MaxScale on CentOS This blog is aimed to help anyone who is interested in setting-up 3 node MariaDB Galera...
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How pt-online-schema-change Handles Foreign Keys
Foreign key related issues are very common when dealing with DDL changes in MySQL using Percona toolkit. In this blog post, I will explain how the tool (pt-online-schema-change) handles foreign key...
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Enterprise Database Solution – Maximizing Return for the Lowest Cost
It used to be easy: a company developed a new application, chose a database solution, launched the new application and then tuned the chosen database solution. A team of DBAs looked at the...
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ScaleGrid DBaaS Expands MySQL Hosting Services Through AWS Cloud
PALO ALTO, Calif., June 6, 2019 – ScaleGrid, the Database-as-a-Service (DBaaS) leader in the SQL and NoSQL space, has announced the expansion of their fully managed MySQL Hosting services to support...
View ArticleMySQL: CPU information from SQL
Do you know that it’s possible to get information from the CPUs of your MySQL Server from SQL ? If you enable the status for the INNODB_METRICS table in INFORMATION_SCHEMA, you will be able to query...
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SQL Having Clause Example | SQL Having Tutorial
SQL Having Clause Example | SQL Having Tutorial is today’s topic. The SQL HAVING clause is used in the combination with a GROUP BY CLAUSE to restrict the groups of returned rows to only those whose...
View ArticlePHP Tutorial: Introducing PHP for Angular 8 developers
Throughout this php tutorial for beginners by example, we'll learn to build web applications with PHP 7 for server and MySQL for database access and storage (and also Angular 8 for front-end). In this...
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How to properly shutdown MySQL before any maintenance activity
How to properly shutdown MySQL before any maintenance activity We might have different scenarios once we need to stop MySQL service before performing either server or database activity like...
View ArticleMySQL Webcasts On Demand en Español & English
Por si no se hubiera visto o promocionado lo suficiente, quería compartir la lista de webcasts en Español que ya hay disponible en On Demand webinars en el apartado de News & Events en mysql.com:...
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An Overview of PostgreSQL to MySQL Cross Replication
This blog is aimed at explaining an overview of cross replication between PostgreSQL and MySQL, and further discussing the methods of configuring cross replication between the two database servers....
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Perform Complex Online Schema Changes on MySQL / MariaDB / Percona Server...
Background The Skinny Performing schema changes often requires extended downtime for applications. This is due to MySQL needing to rebuild tables for common schema change operations. Tools like...
View ArticleCheck the MySQL server startup configuration
Since 8.0.16, MySQL Server supports a --validate-config option that enables the startup configuration to be checked for problems without running the server in normal operational mode. --validate-config...
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Database Automation with Puppet: Deploying MySQL & MariaDB Galera Cluster
In the previous blog post, we showed you some basic steps to deploy and manage a standalone MySQL server as well as MySQL Replication setup using the MySQL Puppet module. In this second installation,...
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