In this blog series, I’m describing how InnoDB locks data (tables and rows) in order to provide illusion to clients that their queries are executed one after another, and how this was improved in recent releases.

As we’ve already seen, the order in which server pretends transactions are happening (the serialization order) is tied to the order in which locks are granted to transactions.…

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While I was working on my grFailOver POC, I have also done some additional parallel testing. One of them was to see how online DDL is executed inside a Group Replication cluster.

The online DDL feature provides support for instant and in-place table alterations and concurrent DML. Checking the Group Replication (GR) official documentation, I was trying to identify if any limitation exists, but the only thing I have found was this:

“Concurrent DDL versus DML Operations.  Concurrent data definition statements and data manipulation statements executing against the same object but on different servers is not supported when using multi-primary mode. During execution of Data Definition Language (DDL) statements on an object, executing concurrent Data Manipulation Language (DML) on the …

As you know, the best way to perform logical dump for MySQL is to use MySQL Shell Dump & Load utilities. This is the most powerful option as it can dump and load in parallel (it also include many options to migrate to MDS very easily and supports OCI Object Store too).

One of the main question I receive related to MySQL Shell utility is related to the use of MySQL Shell in non-interactive mode with parameters requiring arrays.

What does that mean ?

For example if you want to dump a MySQL instance but you want to exclude some tables, you have an option called excludeSchemas and it expect an array of strings with the list of schemas you want to exclude in the dumb.

In interactive mode, this is how we use it:

JS> util.dumpInstance("/tmp/dump", {excludeSchemas: 
    ["mysql_innodb_cluster_metadata", "fred_test"], 
    threads: 8, showProgress: true})

However this notation is not …

Amazon Redshift has been providing scalable, quick-to-access analytics platforms for many years, but the question remains: how do you get the data from your existing datastore into Redshift for processing? This blog looks at that question by providing some background information on Redshift replication as well as details on how to easily replicate from MySQL to Redshift.

Tags: MySQLreplicationreal-timetungsten replicatoramazon marketplace …

Where x is >= 22 ;)

The Problem

There are few things your data does not like. One is water and another is fire. Well, guess what:

If you think that everything will be fine after all, take a look:

Given my ISP had part of its management infrastructure on OVH, they had been impacted by the incident.

As you can see from the highlight, the ticket number in three years changes very little (2k cases) and the date jumps from 2018 to 2021. On top of that, I have to mention I had opened several tickets the month before that disappeared. 

So either my ISP was very lucky and had very few cases in three years and sent all my tickets to /dev/null... or they have lost THREE YEARS of data.   

Let us go straight to the chase; they have lost …

Where x is >= 22

The Problem

There are few things your data does not like. One is water and another is fire. Well, guess what:

If you think that everything will be fine after all, take a look:

Given my ISP had part of its management infrastructure on OVH, they had been impacted by the incident.

As you can see from the highlight, the ticket number in three years changes very little (2k cases) and the date jumps from 2018 to 2021. On top of that, I have to mention I had opened several tickets the month before that disappeared. 

So either my ISP was very lucky and had very few cases in three years and sent all my tickets to /dev/null… or they have lost THREE YEARS of data.   

Let us go straight to the chase; they have lost their …

This blog provides high availability (HA) guidelines using group replication architecture and deployment recommendations in MySQL, based on our best practices.

Every architecture and deployment depends on the customer requirements and application demands for high availability and the estimated level of usage. For example, using high read or high write applications, or both, with a need for 99.999% availability.

Here, we give architecture and deployment recommendations along with a technical overview for a solution that provides a high level of high availability and assumes the usage of high read/write applications (20k or more queries per second).

Layout

Components

This architecture is composed of two main layers:

• Connection and distribution layer
• RDBMS …

Any of you who read my blog posts here regularly know I am passionate about SQL, PHP, and Back-end Development. I consider writing an integral part of my brand and growth. Continue reading and learn more about what’s on my mind lately with writing and code…

Image by Arek Socha from Pixabay

Self-Promotion:

If you enjoy the content written here, by all means, share this blog and your favorite post(s) with others who may benefit from or like it as well. …

This blog provides high availability (HA) guidelines using group replication architecture and deployment recommendations in MySQL, based on our best practices.

Every architecture and deployment depends on the customer requirements and application demands for high availability and the estimated level of usage. For example, using high read or high write applications, or both, with a need for 99.999% availability.

Here, we give architecture and deployment recommendations along with a technical overview for a solution that provides a high level of high availability and assumes the usage of high read/write applications (20k or more queries per second).

Layout

Components

This architecture is composed of two main layers:

• Connection and distribution layer
• RDBMS …

The article presents a detailed tutorial on MySQL JOINs. In it, you will learn about different types of JOINS that are supported in MySQL, their syntax, and how to use them. Introduction to MySQL JOINsDifferent types of JOINs in MySQL1. MySQL INNER JOIN clause2. MySQL OUTER JOINs2.1 MySQL LEFT JOIN clause2.2 MySQL RIGHT JOIN clause3. […]

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