The latest from the MySQL community

Many things in the MySQL 8.0 Series has evolved. I’ve discussed many of those things in prior blogs such as items like the MySQL-Router w/InnoDB Cluster, plus a Series on Enterprise Backup with InnoDB Cluster Backup & Restore Use Cases. But now its time to update everyone on the evolution of the Yum Repo packaging… Read More »

Many things in the MySQL 8.0 Series has evolved. I’ve discussed many of those things in prior blogs such as items like the MySQL-Router w/InnoDB Cluster, plus a Series on Enterprise Backup with InnoDB Cluster Backup & Restore Use Cases. But now its time to update everyone on the evolution of the Yum Repo packaging in MySQL 8.0.18!… Read More »

When you installed the Debezium MySQL connector, then it’ll start read your historical data and push all of them into the Kafka topics. This setting can we changed via snapshot.mode parameter in the connector. But if you are going to start a new sync, then Debezium will load the existing data its called Snapshot. Unfortunately, if you have a busy transactional MySQL database, then it may lead to some performance issues. And your DBA will never agree to read the data from Master Node.[Disclaimer: I’m a DBA :) ]. So I was thinking of figuring out to take the snapshot from the Read Replica, once the snapshot is done, then start read the realtime data from the Master. I found this useful information in a StackOverflow answer.

If your binlog uses GTID, you should be able to make a CDC tool like Debezium read the snapshot from the replica, then when that’s done, switch to the master to read the binlog. But if you don’t use …

MySQL InnoDB Cluster has introduced by the MySQL team for the High Availability ( HA ) purpose . It provides a complete high availability solution for MySQL.

Alright, I am planning to write the series of the blogs about the InnoDB Cluster configurations / Management with MySQL Shell / Monitoring etc …

In this blog I am going to show the InnoDB Cluster configuration with three nodes .

What is InnoDB Cluster ?

MySQL InnoDB Cluster is the Combination of,

• MySQL shell
• Group Replication ( GR )
• MySQL Router

Lab Environment :

I have prepared my lab with three servers,

• OS : Centos 7.7
• MySQL 8.0.18 ( latest version )

The server details are ,

• 192.168.91.11 ( hostname : sakthilabs11 )
• 192.168.91.12 ( hostname : sakthilabs12 )
…

One of our support customers approached us with the following problem the other day:

mysql> CREATE TABLE child_table (
`id` int unsigned auto_increment,
`column1` varchar(64) NOT NULL,
parent_id int unsigned NOT NULL,
PRIMARY KEY (`id`),
CONSTRAINT FOREIGN KEY (parent_id) REFERENCES parent_table (id));
ERROR 1215 (HY000): Cannot add foreign key constraint

They could not create a table with an FK relation! So, of course, we asked to see the parent table definition, which was:

CREATE TABLE `parent_table` (
  `id` int unsigned auto_increment, 
  `column1` varchar(64) COLLATE utf8_bin NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  
PARTITION BY HASH (id) 
PARTITIONS 4;

The parent table is partitioned!  This immediately explained the problem; partitioned tables can not be part of an FK relationship, as described (in point 10) here – …

As you could read in this previous post, PHP 7.4 is now completely supporting MySQL 8.0 and the new default authentication plugin.

I wanted to make a summary table providing and overview of all PHP versions and how they supported MySQL 8.0 and the different authentication plugins.

As I am a RPM based distribution user, I’m using the famous repository of remi since a lot of years, and I use it then also to install PHP 7.4.0 and 7.4.1…

I created a new user to test to …

Credit: AWS

CDC is becoming more popular nowadays. Many organizations that want to build a realtime/near realtime data pipe and reports are using the CDC as a backbone to powering their real-time reports. Debezium is an opensource product from RedHat and it supports multiple databases (both SQL and NoSQL). Apache Kafka is the core of this.

Managing and scaling Kafka clusters is not easy for everyone. If you are using AWS for your infra then let AWS manage the cluster. AWS has MSK is a managed Kafka service. We are going to configure Debezium with AWS MSK.

Configuration File:

If you are already worked with AWS MSK, then you might be familiar with this configuration file. This is similar to the RDS Parameter group but here you need to upload a with your parameter name and its value. If you are using MSK for the first time, then it’ll make you a bit confused. No worries, I’ll give you the steps to do …

We are living in the DataLake world. Now almost every oraganization wants their reporting in Near Real Time. Kafka is of the best streaming platform for realtime reporting. Based on the Kafka connector, RedHat designed the Debezium which is an OpenSource product and high recommended for real time CDC from transnational databases. I referred many blogs to setup this cluster. But I found just basic installation steps. So I setup this cluster for AWS with Production grade and publishing this blog.

A shot intro:

Debezium is a set of distributed services to capture changes in your databases so that your applications can see those changes and respond to them. Debezium records all row-level changes within each database table in a change event stream, and applications simply read these streams to see the change events in the same order in which they occurred.

Basic Tech Terms:

• Kafka …

We are living in the DataLake world. Now almost every organizations wants their reporting in Near Real Time. Kafka is of the best streaming platform for realtime reporting. Based on the Kafka connector, RedHat designed the Debezium which is an OpenSource product and high recommended for real time CDC from transnational databases. I referred many blogs to setup this cluster. But I found just basic installation steps. So I setup this cluster for AWS with Production grade and publishing this blog.

A shot intro:

Debezium is a set of distributed services to capture changes in your databases so that your applications can see those changes and respond to them. Debezium records all row-level changes within each database table in a change event stream, and applications simply read these streams to see the change events in the same order in which they occurred.

Basic Tech Terms:

• Kafka …

Slow queries, inefficient queries, or long running queries are problems that regularly plague DBA's. They are always ubiquitous, yet are an inevitable part of life for anyone responsible for managing a database. 

Poor database design can affect the efficiency of the query and its performance. Lack of knowledge or improper use of function calls, stored procedures, or routines can also cause database performance degradation and can even harm the entire MySQL database cluster. 

For a master-slave replication, a very common cause of these issues are tables which lack primary or secondary indexes. This causes slave lag which can last for a very long time (in a worse case scenario).

In this two-part series blog, we'll give you a refresher course on how to tackle the maximizing of your database queries in …