Overview

DDL (Data Definition Language) statements create, alter, and remove database objects. These types of changes can be a very dangerous action to take on such a critical piece of your infrastructure. You want to make sure that the command that you are executing has been given proper thought and testing.

In this post I go through multiple version of MySQL and verify the best course of action to take in regards to executing DDL statements.  There are many things that you have to consider when making these types of changes, such as disk space, load on the database server, slave replication, the type of DDL statement you are executing, and if it will lock the table. 

Because of these risks, there are tools that can be used to help mitigate some of the dangers. But unless you have tested and verified their functionality, these tools in themselves can cause trouble. Whenever in doubt, take the time to test …

This blog examines MySQL 5.7’s primary key lookup results, and determines if MySQL 5.7 is really faster than its early versions.

MySQL 5.7 was released some time ago, and now that the dust has settled it’s a good time to review its performance improvements.

I’m not doing this just to satisfy my own curiosity! Many customers still running MySQL 5.6 (or even MySQL 5.5) often ask “How much performance gain we can expect by switching to 5.7? Or will it actually be a performance hit, especially after Peter’s report here: https://www.percona.com/blog/2013/02/18/is-mysql-5-6-slower-than-mysql-5-5/?”

To determine the answer, we’ll look at some …

When your database undergoes a restart, whether it's a clean reboot or a crash, it will typically create two negative effects your application will have to face: blackout (downtime) and brownout (period of degraded performance after startup).

In my previous post, I described how Aurora makes downtime less stressful for you, now it's time to investigate yet another feature that should come in handy in mission-critical environments: the survivable page cache.

Introduction As usual, let's throw in a tiny bit of theory before looking at the demonstrations.
The InnoDB Buffer Pool is an in-memory area for caching data and index pages. That said, buffer pool can also be called a "page cache". Both terms mean …

This blogpost extends last one. In the last blogpost, we had a look into Docker Network and how it makes the communication between the containers (over multiple hosts) easier. Of course we used Galera for that :)

In this blogpost we are going to use Docker Swarm to bootstrap a Galera Cluster.

Why using Docker Swarm?

Docker Swarm is (simplified) a proxy. So we've got one accesspoint to manage multiple hosts. (The swarm manage service will run on 172.17.152.11:2376). We also use Docker Swarm to abstract from the nodes. As we want the cluster to be running but we don't want to define explicitly where to run them. (Think about a 3-node-cluster on Docker Swarm with 100 nodes.)

Let us point the local docker to Docker Swarm:

export DOCKER_HOST=tcp://172.17.152.11:2376

We still got …

The MariaDB project is pleased to announce the immediate availability of MariaDB 10.1.13, and MariaDB Connector/J 1.3.7. See the release notes and changelogs for details on these releases. Download MariaDB 10.1.13 Release Notes Changelog What is MariaDB 10.1? MariaDB APT and YUM Repository Configuration Generator Download MariaDB Connector/J 1.3.7 Release Notes Changelog About MariaDB Connector/J […]

The post MariaDB 10.1.13 and Connector/J 1.3.7 now available appeared first on MariaDB.org.

Admit it, you’ve always wanted to fight danger, win battles and save the day! Who doesn’t? Do you want to be a superhero? Percona can show you how!

We don’t have any radioactive spiders or billionaire gadgets, but we do have our own team of superheroes dedicated to protecting your database performance: The Database Performance Team!

The Database Performance Team is comprised of our services experts, who work tirelessly every day to guarantee the performance of your database. Percona’s database services are some of our most valuable customer resources – besides the software itself. Whether it’s support, consulting, technical account managers, or …

Last time this blog covered digging into a JSON document in a MySQL 5.7 table. The goal was to pull certain records matching a particular criteria. Both Peter Zaitsev and Morgan Tocker get my thanks for their kind comments. My example was a little contrived in that an application would be used to fine tune seeking for a particular key value pair. I was trying to pull single records which is kind of silly when it is much easier to use PHP to parse the data. What follows below is a sample PHP script to grab out the matching records and then feed the results, the JSON document, into an array.

#!/usr/bin/php
<?php
$mysqli = new mysqli("localhost", "root", "hidave", "test");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", …

InnoDB in MySQL 5.7 introduced for the first time the ability to create a general tablespace and assign multiple tables to it.  These tablespaces can be assigned anywhere on the system.  They can even be assigned a smaller block size so that they can contain compressed tables that use that size as their key_block_size.…

This blog discusses how TokuDB impacts InnoDB performance when the two run in the same environment.

You would think MySQL storage engines are fairly independent of each other, even in the same environment. Enabling one, or changing its configuration, logically should have no impact on the performance of other engines (such as InnoDB) when they are accessing tables. The reality, however, is more complicated than that!    

Now that we’ve shipped TokuDB, we’ve been getting feedback from our community and customers that enabling TokuDB might negatively affect performance – even for queries that don’t touch TokuDB tables (and in some cases, even when TokuDB is kept completely idle).

In today’s simple article we will cover the steps needed for installing and configuring a basic LEMP stack on a openSUSE VPS. A LEMP stack is a synonym of LEMP server or LEMP web server. It refers to a set-up which includes Linux, Nginx, MySQL (MariaDB) and PHP. REQUIREMENTS We will be using our SSD 1 Linux VPS hosting plan for this tutorial. Log in to your server via SSH: # ssh root@server_ip Before starting, enter the command below to check whether you have the proper OS version installed on your machine: # cat /etc/issue which should give you the […]