During the development of the myloader –innodb-optimize-keys option, which was released in version 0.10.7, we found several issues and opportunities to improve the process. We had to change the approach, reimplement some of the core functionality and add a couple of data structures. That allowed us to implement, at a really low cost, a feature that executes the files that contain INSERT statements, sorted by Primary Key. This is desirable to reduce page splits, which cause on-disk tablespace fragmentation.

In this blog post, I will present the differences in data fragmentation for each version.

Test Details

These are local vm tests as there is no intention to show performance gain.

The table that I used is: …

Two or more dots in your relay log or binary log names can break replication; but worry not, it will only do it once. If you request to start again,…

The post Relay log read failure | 2 many dots can break your replication only once first appeared on Change Is Inevitable.

Database architecture and design are becoming an increasingly lost art. With new technologies and the push towards faster development cycles, people continue to take shortcuts, often to the detriment of long-term performance, scalability, and security. Designing how your application stores, accesses, and processes data is so fundamentally important, it can not be overlooked. I want people to understand that early design choices can have a profound impact on their applications. To that end, I will be exploring database design principles and practices over the next several months. I am starting with every developer’s favorite data format: JSON!

It seems that almost every database over the last few years has introduced various degrees of support for storing and interacting with JSON objects directly. While these features are designed to make it easier for application developers to write code faster, the implementations of each implementation …

This is the third episode of “Discovering MySQL Database Service“, a series of tutorials where I will show you, step by step, how to use MySQL Database Service and some other Oracle Cloud Infrastructure services.

In the previous episode we’ve created our compartment, the foundation stone, of the architecture that we will build during this Discovering MySQL Database Service journey.

In this episode, we’ll see what is a Virtual Cloud Network (VCN) and how to create one and use it.

The post Discovering MySQL Database Service – Episode 3 – Create a Virtual Cloud Network first appeared on dasini.net - Diary of a MySQL expert.

On MySQL Database Service (aka MDS) on Oracle Cloud Infrastructure (aka OCI), when you create a new instance, you also need to set the credentials for the administrator:

Let’s focus on that account…

Please don’t forget the password, it cannot be recovered !!

First of all that account’s username has some limitations. Indeed, some names are reserved as it’s mentioned in the manual. So you could not use the following usernames:

• administrator
• ociadmin
• ocirpl
• mysql.sys
• mysql.session
• mysql.infoschema

This list can evolve, you can get the list directly from the MySQL DB System creation’s screen:

In fact, those accounts are already existing in the MySQL DB …

We recently saw that .frm files have been somewhat of replaced for MyISAM tables in MySQL 8.0 (see this post).

However, what are those files ? Can they be used for something else than MyISAM tables ? … Let’s try to answer those questions and get more familiar with the .sdi files.

What does SDI stand for ?

SDI acronym stands for Serialized Dictionary Information.

As you may know already, MySQL 8.0 replaced the old way to store the metadata of tables, their structure, into the new transactional Data Dictionary (in InnoDB).

Additionally, that information is also part any InnoDB tabespace , its is appended to the tablespace, so the meta data and data are bundled …

This is the second episode of “Discovering MySQL Database Service“, a series of tutorials where I will show you, step by step, how to use MySQL Database Service and some other Oracle Cloud Infrastructure services.

In the previous episode we've introduced the different components that we will use during this Discovering MySQL Database Service journey.

In this episode, we'll see what is a compartment and how to create one and use it in order to create a MySQL DB system.

The post Discovering MySQL Database Service – Episode 2 – Create a compartment first appeared on dasini.net - Diary of a MySQL expert.

On December 2, Edward Screven, Oracle’s chief corporate architect revealed the Oracle MySQL Database Service with Analytics Engine known as HeatWave.

During Oracle Live on August 10th, 9AM PST, 12 noon ET / 1 PM BRT / 6 PM CEST, Edward Screven will share our latest MySQL innovations, along with the latest benchmarks, that show the speed and cost savings gained with MySQL HeatWave.

HeatWave, in-memory query accelerator for the Oracle MySQL Database Service, allows customers to run very fast analytics queries directly against their MySQL databases entirely avoiding the step of data ETL into a …

On Oracle Cloud Infrastructure, aka OCI, MySQL Database Service, aka MDS uses the snapshot technology to backup your data.

This article is the second part of multiple part blog series. In part 1, we dealt with taking snapshots as backup. In this part, we deal with restoring the data.

Managed Snapshots

We saw in the post one how to create the snapshots automatically (Backup Plan) or Manually. Both type of backups are what we call Managed Snapshots. This means that as a user, we don’t have access to the Object Storage where the backup is stored.

So what’s the purpose of these snapshots ?

Let’s see them:

Data Restore

Restoring a MDS backup is recommended of course to save the data and in case of issue (hardware or software problem unlikely or human issue more …

On Oracle Cloud Infrastructure, aka OCI, MySQL Database Service, aka MDS uses the snapshot technology to backup your data.

I will explain how it works in the multiple part blog series. In part 1, we will deal with taking snapshots as backup. In part 2, we will see how to restore data and for which usage.

Snapshots

The Oracle Cloud Infrastructure Block Volume service provides you with the capability to group together multiple volumes in a volume group.

This is exactly what MDS uses to store the data.

We can easily see this from some global variables:

+-----------------------------+--------------------------------+ | Variable_name | Value | +-----------------------------+--------------------------------+ | datadir | /db/data/ | | innodb_data_home_dir | /db/data/ | | innodb_log_group_home_dir …