In this blog, we’ll look at how to achieve better-than-linear scaling.

Scalability is the capability of a system, network or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth. For example, we consider a system scalable if it is capable of increasing its total output under an increased load when resources (typically hardware) are added: https://en.wikipedia.org/wiki/Scalability.

It is often accepted as a fact that systems (in particular databases) can’t scale better than linearly. By this I mean when you double resources, the expected performance doubles, at best (and often is less than doubled).  

We can attribute this assumption to Amdahl’s law (https://en.wikipedia.org/wiki/Amdahl%27s_law), and later …

The MariaDB project is pleased to announce the immediate availability of MariaDB 5.5.55 Stable (GA), MariaDB Galera Cluster 5.5.55 Stable (GA) and MariaDB Connector/J 2.0.0 RC. See the release notes and changelogs for details. Download MariaDB 5.5.55 Release Notes Changelog What is MariaDB 5.5? MariaDB APT and YUM Repository Configuration Generator Download MariaDB Galera Cluster […]

The post MariaDB 10.3.0 Alpha, 5.5.55 Stable, and Connector/J 2.0.0 RC now available appeared first on MariaDB.org.

The MySQL team is constantly improving and innovating the product… this time, after having put particular attention to DBAs and operators with Group Replication & InnoDB Cluster,  let’s have a look to what we can also bring to developers.

Let’s start with the following challenge:

Add 5 books from scratch with all their metadata (authors, isbn, edition, year, …) in last than 5 minutes using only MySQL Shell in command line !

Do you thinks this is not possible ? Check the video below:

Amazing isn’t it ?

If you want to learn more about this, please attend Mike Zinner & Alfredo Kojima’s session at Percona Live next week:

This quick post demonstrates using Percona Server for MySQL in Docker Swarm with some new authentication provisioning practices.

Some small changes to the startup script for the Percona-Server container image allows us to specify a file that contains password values to set as our root user’s secret. “Why do we need this functionality,” I hear you cry? When we use an environment variable, it’s not terribly hard to locate the value to which someone has set as their database root password. Environment variables are not well suited for sensitive data. We preach against leaving our important passwords in easy to reach places. So moving towards something more secure whilst retaining usability is desirable. …

In this blog post, we’ll look at a feature that recently added to Percona XtraDB Cluster 5.7.16, that makes it easier to configure Percona XtraDB Cluster SSL for all related communications. It uses mode “encrypt=4”, and configures SSL for both IST/Galera communications and SST communications using the same SSL files. “encrypt=4” is a new encryption mode added in Percona XtraDB Cluster 5.7.16 (we’ll cover it in a later blog post).

If this option is used, this will override all other Galera/SST SSL-related file options. This is to ensure that a consistent configuration is applied. Using this option also means that the Galera/SST communications are …

In this blog, we’ll look at how to setup and troubleshoot the Percona PAM authentication plugin.

We occasionally get requests from our support clients on how to get Percona Server for MySQL to authenticate with an external authentication service via LDAP or Active Directory. However, we normally do not have access to client’s infrastructure to help troubleshoot these cases. To help them effectively, we need to setup a testbed to reproduce their issues and guide them on how to get authentication to work. Fortunately, we only need to install Samba to provide an external authentication service for both LDAP and AD.

In this article, I will show you how to (a) compile and install Samba, (b) create a domain environment with Samba, (c) add users and groups to this domain and (d) get Percona Server …

In this tutorial, we are going to guide you through the entire process of creating a 3 node InnoDB cluster in Oracle Public Cloud (OPC). We will address each of the steps, from the initial configuration and setup of the OPC IaaS resources to the InnoDB cluster creation and setup.…

Yes, another post about my talks at Percona Live Santa Clara: I obviously still have things to share.  This time, I will focus on my parallel replication talks by giving a short preview.

I have two parallel replication talks at Percona Live:

MySQL/MariaDB Parallel Replication: inventory, use cases and limitations (Wednesday talk) MySQL Parallel Replication: all the 5.7 (and some of the 8.0)

In this blog post, we’ll look at how Percona XtraDB Cluster uses IST.

Introduction

Percona XtraDB Cluster uses the concept of an Incremental State Transfer (IST). When a node of the cluster leaves the cluster for a short period of time, it can rejoin the cluster by getting the delta set of missing changes from any active node in the cluster.

This process of getting the delta set of changes is named as IST in Percona XtraDB Cluster.

Tracking IST Progress

The number of write-sets/changes that the joining node needs to catch up on when rejoining the cluster is dictated by:

1. The duration the node was not present in the cluster
…

In this blog post, we’ll discuss trackable flow control in Percona XtraDB Cluster.

Introduction

Percona XtraDB Cluster has a self-regulating mechanism called Flow Control. This mechanism helps to avoid a situation wherein the weakest/slowest member of the cluster falls significantly behind other members of the cluster.

When a member of a cluster is slow at applying write-sets (while simultaneously continuing to receive write-sets from the cluster group channel), then the incoming/receive queue grows in size. If this queue crosses a set threshold (gcs.fc_limit), the node emits a FLOW_CONTROL message asking other members to slow down or halt processing.

While …