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Tips for Monitoring MySQL for Moodle

Database monitoring is a critical part of any application’s maintenance. Finding database issues on time can help the application remain healthy and accessible. Without monitoring in place, database outages can be prolonged, resulting in increased downtime for users. In this blog we are going to explain what you need to monitor in a Moodle Database, and how you can do it using ClusterControl.

ClusterControl Monitoring 

Using ClusterControl you can monitor the databases efficiently, it can do so by deploying agents on the database hosts or in an agentless fashion, by simply connecting to the databases via SSH . Data is presented in a GUI, in the form of a number of dashboards and charts. 

How Does ClusterControl Monitoring Work ?

ClusterControl …

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MySQL Database Service with HeatWave is now available in 22 regions

We are pleased to announce that MySQL Database Service with HeatWave is now available in 22 regions worldwide. 

With the introduction of 10 new regions, MySQL Database Service is now present in all Oracle Cloud Infrastructure commercial regions:

North America  US East (Ashburn)  US West (Phoenix)  US West (San Jose)  Canada Southeast (Toronto)  Canada Southeast (Montreal) Latin America  Brazil East (Sao Paulo)  Chile Central (Santiago) EMEA  UK South (London)  UK West (Newport)  Germany Central (Frankfurt)  Switzerland North (Zurich)  Netherlands Northwest (Amsterdam)  Saudi Arabia West (Jeddah)  UAE East (Dubai) APAC  Japan East (Tokyo)  Japan Central (Osaka)  South Korea Central (Seoul)  South Korea North (Chuncheon)  Australia East (Sydney)  Australia Southeast (Melbourne)  India West (Mumbai)  India South …

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Galera Cluster for MySQL 5.6.50, 5.7.32, and 8.0.22 released

Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 5.6, 5.7 and 8.0, consisting of MySQL-wsrep 5.6.50 (release notes, download), 5.7.32 (release notes, download) and 8.0.22 (release notes, download) with Galera replication library 3.32 ( …

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MySQL NDB Cluster Backup & Restore In An Easy Way

In this post, we will see, how easily user can take NDB Cluster backup and then restore it. NDB cluster supports online backups, which are taken while transactions are modifying the data being backed up. In NDB Cluster, each backup captures all of the table content stored in the cluster.

User can take backup in the following states:

  • When the cluster is live and fully operational
  • When the cluster is live, but in a degraded state:
    • Some data nodes are down
    • Some data nodes are restarting
  • During read and write transactions

Users can restore backups in the following cluster environments:

  • Restore to the same physical cluster
  • Restore into a different physical cluster
  • Restore into a different configuration cluster i.e. backup …
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MySQL Best of 2020

2020 was a very eventful year at MySQL. Now that we just started 2021, this is a great time to look back at everything we accomplished in 2020, from the anniversary celebrations to the year's best webinars, the best events, the best customer quotes, the best new product addition, the best animated videos, the best social media contribution, the best social media posts and of course, Larry’s best quote and many more.  Here is our "Best of 2020," enjoy!  (We'd love to see your favorites too.  Feel free to share your favorites with us in the comment section)

1. 2020 was our MySQL 25th anniversary which we shared and celebrated with our friends from Java and PHP.  Watch the animated video that celebrates 25 years of community contribution and loyal customers and users.

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MySQL Backup and Recovery Best Practices

In this blog, we will review all the backup and restore strategies for MySQL, the cornerstones of any application. There are a few options, depending on your topology, MySQL versions, etc. And based on that, there are some questions we need to ask ourselves to make sure we make the right choices.

How many backups we need to keep safe, or what’s the best retention policy for us?

This means the number of backups to safeguard, whether local or remote (external fileserver, cloud). The retention policy can be daily, weekly, or monthly, depending on the free space available.

What is the Recovery Time Objective?

The Recovery Time Objective (RTO) refers to the amount of time that may pass during a disruption before it exceeds the maximum allowable threshold specified in the Business Continuity Plan.

The key question related to RTO is, “How quickly must the data on this system be restored?”

What is …

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FOSDEM 2021 MySQL Devroom Schedule

The FOSDEM 2021 MySQL Devroom Schedule is now online.

Thank you again to all who submitted a talk and thank you the to Committee for having build such agenda.

It seems that once again, MySQL Operations and Architecture are very popular.

As you probably know already, this event will be totally online this year.

I would like to thanks the people who were able to jump after some cancellations… virtual events are not the most popular for speakers.

The MySQL Devroom will take place Sunday February 7th form 10AM to 6PM CEST.

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Webinar January 26: Using Percona Monitoring and Management to Identify and Troubleshoot Problematic MySQL Queries

Join us as Michael Coburn, Percona Product Manager, discusses two methods to identify and troubleshoot problematic MySQL queries using the RED Method and Percona Monitoring and Management (PMM) Query Analytics. He will also highlight specific Dashboards in PMM that visualize the rate, errors, and duration of MySQL events that may be impacting the stability and performance of your database instance.

Please join Michael Coburn, Product Manager, Percona, on Tuesday, January 26th, 2021 at 2:30 pm for his webinar “Using Percona Monitoring and Management to Identify and Troubleshoot Problematic MySQL Queries”.

Register for Webinar

If you can’t attend, sign up anyway

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MySQL macOS Docker

While you can download MySQL as a DMG package, a number of users would prefer to install it as a Docker instance. You won’t find the macOS downloads on the same web site as other downloads. You can use the following macOS download site.

After installing Docker on your macOS, you can pull a copy of the current MySQL Server with the following command:

docker pull mysql/mysql-server

You should create a mysql directory inside your ~/Documents directory with this command:

mkdir ~/Documents/mysql

Then, you should use the cd command to change into the ~/Documents/mysql directory and run this command:


It should return the following directory: …

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MySQL Group Replication – How to Elect the New Primary Node

In this blog, I am going to explain the different ways of electing the PRIMARY node in MySQL group replication. Before MySQL 8.0.2, primary election was based on the member’s UUID, with the lowest UUID elected as the new primary in the event of a failover.

From MySQL 8.0.2: We can select the node to be promoted as a PRIMARY using the server weight ( group_replication_member_weight ). This can be achieved during the failure of the current primary node.

From MySQL 8.0.12: We can promote any node as a PRIMARY using the function “group_replication_set_as_primary”. This can be set anytime without any failures of nodes.


 I have installed the 3 node group replication cluster. I am using Percona Server for MySQL 8.0.22.

mysql> select …
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