To continue our journey to Moodle on Oracle Cloud Infrastructure using Ampere compute instances and MySQL HeatWave Database Service [1] [2], in this article we will see how to scale our architecture using multiple Moodle instances, High Availability for the Database and Read Scale-Out.

This is the architecture we will deploy:

The same principles can be applied to other projects, not just Moodle.

Multiple Compute Instances & MySQL HeatWave High Availability

The first step is to use again the Stack to deploy the initial resources. We must insure that we use a MySQL Shape that has at least 4 OCPUs to …

In the previous post, we saw how to quickly deploy Moodle to Oracle Cloud Infrastructure on Ampere compute instances and using MySQL HeatWave.

In this post, we will explore some other features and the benefits of running on OCI and MySQL HeatWave to extend our architecture dedicated to Moodle in the Cloud.

Read Replicas

Moodle natively offers the possibility of distributing the load between reads and writes. When using MySQL HeatWave Database Service, adding read replicas is also a very easy task. Let’s see how we can benefit from it.

To be able to use MySQL HeatWave Read Replicas, the MySQL shape must have at least 4 OCPUs.

Let’s modify the moodle stack and deploy it again but this time we choose a bigger shape for MySQL:

When everything is ready, …

If you want to deploy Moodle on OCI, you can use Ampere compute instances as application server and MySQL HeatWave Database Service to store the data.

Depending on your requirements, MySQL HeatWave can provide High Availability and Query Acceleration.

In this post, we will see the easiest and fasted way to deploy the following basic architecture:

In OCI to quickly deploy an architecture and all the required resources, it’s recommended to use a Stack (Terraform recipes and modules).

So deploy all the resources we need (VCN, Subnets, Security Lists, Internet Gateways, Compute Instances…) we just need to click on the following button:

…

This post was originally published in July 2018 and was updated in July 2023.

Now that Database-as-a-service (DBaaS) is in high demand, there are multiple questions regarding AWS services that cannot always be answered easily: When should I use Aurora and when should I use RDS MySQL?  What are the differences between Aurora and RDS? How do I choose which one to use?

In this blog, we will answer all of these important questions and provide a general overview comparing the two database services, Aurora vs RDS.

Understanding DBaaS

DBaaS cloud services allow users to use databases without configuring physical hardware and infrastructure or installing software. But …

We already saw how to deploy Apache Superset with MySQL HeatWave.

I just released a new version of the Terraform modules including some configuration parameters for a future development related to High Availability.

So let’s see the easiest way to deploy Superset on OCI using MySQL HeatWave.

Quick Deployment

The default deployment is the following:

The fastest and easiest way to deploy such architecture is to click on the button below:

When you click on the button, you will reach the following screen if you are …

Last time we tried to connect to a MySQL DB instance in OCI with Cloud Shell, we needed to use the bastion service. See here.

Now, we also have the possibility to bypass the bastion host as Cloud Shell offers the possibility to change network.

As you know, in Oracle Cloud Infrastructure, a MySQL DB instance is not exposed in the public subnet and doesn’t have the possibility to get a public IP.

In the Private Subnet, we often have a security list allowing all internal IPs (from public and private subnet of the VCN) to connect to the MySQL port(s).

If the security list is present, we can click on the Cloud Shell icon and once loaded, change the network:

We need to create a new Private Network Definition:

In case you don’t have the ports open for MySQL in the …

Learn how to seamlessly add a new node to MySQL Group Replication from a backup. Scale your cluster, save time, and efficiently manage data updates and recoveries.

1. Hot Physical backup approach
2. Clone plugin approach
3. Logical backup approach

We highly recommend checking out our previous blog post on …

I already wrote on how to deploy WordPress on OCI using MySQL HeatWave, the MySQL Database Service in Oracle Cloud Infrastructure:

• Using MySQL Database Service for WordPress
• Deploying WordPress on OCI with MySQL Database Service: the easy way !
• Deploy WordPress on OCI using MDS – updated version
• Deploy WordPress on OCI with MySQL Database Service using Read Replicas
• …

Explore the powerful features of Aurora Serverless V2 for MySQL in this informative blog series. Learn about read-only scaling, parameter support, and cost performance. Compare costs between Provisioned Aurora and Aurora Serverless V2. Discover key takeaways for optimizing your MySQL deployment on the cloud. Read now!

1. Read-only Scaling
   1. Failover replicas
   2. …

Historically MySQL is great in horizontal READ scale. The scaling, in that case, is offered by the different number of Replica nodes, no matter if using standard asynchronous replication or synchronous replication.

However, those solutions do not offer the same level of scaling for writes operation.

Why? Because the solutions still rely on writing in one single node that works as Primary. Also, in the case of multi-Primary, the writes will be distributed by transaction. In both cases, when using virtually-synchronous replication, the process will require certification from each node and local (by node) write; as such, the number of writes is NOT distributed across multiple nodes but duplicated.

The main reason behind this is that MySQL is a relational database system (RDBMS), and any data that is going to be written in it must respect the RDBMS …