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Displaying posts with tag: Replication (reset)
The MySQL High Availability Landscape in 2017 (The Elders)

In this blog, we’ll look at different MySQL high availability options.

The dynamic MySQL ecosystem is rapidly evolving many technologies built around MySQL. This is especially true for the technologies involved with the high availability (HA) aspects of MySQL. When I joined Percona back in 2009, some of these HA technologies were very popular – but have since been almost forgotten. During the same interval, new technologies have emerged. In order to give some perspective to the reader, and hopefully help to make better choices, I’ll review the MySQL HA landscape as it is in 2017. This review will be in three parts. The first part (this post) will cover the technologies that have been around for a long time: the elders. The second part will focus on the technologies that are very popular today: the adults. Finally, the last part will try to extrapolate which technologies could become popular in the upcoming years: the …

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Getting Started with MySQL Replication for High-Availability

Many organizations have MySQL or MariaDB databases at the core of their business—for processing and storing product sales, collecting information related to services offered, or just providing essential information to customers. As a result, keeping these databases running continuously can be critical for the success of an organization.

There are many components of a database system that a database administrator will need to consider for maintaining high availability. We considered server equipment (e.g., memory) in a previous introductory article. Now let’s look at using multiple servers for your MySQL and MariaDB databases—let’s look at replication.

Replication Overview

One common and effective way to structure a highly available database system is through some form of database replication. There are a few reasons …

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Kafka Replication from MySQL and Oracle

Hello again everybody.

Well, I promised it a couple of weeks ago, and I’m sorry it has been so long (I’ve been working on other fun stuff in addition to this). But I’m pleased to say that we now have a fully working applier that takes data from an incoming THL stream, whether that is Oracle or MySQL, and converts that into a JSON document and message for distribution over a Kafka topic.

Currently, the configuration is organised with the following parameters:

  • The topic name is set according to the incoming schema and table. You can optionally add a prefix. So, for example, if you have a table ‘invoices’ in the schema ‘sales’, your Kafka topic will be sales_invoices, or if you’ve added a prefix, ‘myprefix_schema_table’.
  • Data is marshalled into a JSON document as part of the message, and the structure is to have a bunch of metadata and then an embedded record. You’ll see an …
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How to break MySQL InnoDB cluster

A few weeks ago I started experimenting with MySQL InnoDB cluster. As part of the testing, I tried to kill a node to see what happens to the cluster.

The good news is that the cluster is resilient. When the primary node goes missing, the cluster replaces it immediately, and operations continue. This is one of the features of an High Availability system, but this feature alone does not define the usefulness or the robustness of the system. In one of my previous jobs, I worked at testing a commercial HA system and I've learned a few things about what makes a reliable system.

Armed with this knowledge, I did some more experiments with InnoDB Cluster. The attempt from my previous article had no other expectation than seeing operations continue with ease (primary node …

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What About ProxySQL and Mirroring?

In this blog post, we’ll look at how ProxySQL and mirroring go together.


Let me be clear: I love ProxySQL, and I think it is a great component for expanding architecture flexibility and high availability. But not all that shines is gold! In this post, I want to correctly set some expectations, and avoid selling carbon for gold (carbon has it’s own uses, while gold has others).

First of all, we need to cover the basics of how ProxySQL manages traffic dispatch (I don’t want to call it mirroring, and I’ll explain further below).

ProxySQL receives a connection from the application, and through it we can have a simple SELECT or a more complex transaction. ProxySQL gets each query, passes them to the Query Processor, processes them, identifies if a query is mirrored, duplicates the whole MySQL session ProxySQL internal object and associates it to a mirror queue (which refer to a …

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Better Replication when running both InnoDB and MyRocks (or other Storage-Engines)

Kristian Nielsen is working on a new feature for MariaDB 10.3 and he published very interesting results.  This feature is MDEV-12179: Per-engine mysql.gtid_slave_pos tables.  He writes about replicating twice as fast in the worst case when using two storage engines (InnoDB and MariaRocks in his tests, but could also be InnoDB and TokuDB or TokuDB and MyRocks).  I will let you read all the details

MySQL InnoDB Cluster in Oracle Public Cloud: A Tutorial – Part 2

In the first part of this series you learned how to setup an InnoDB cluster using Oracle Cloud. In this second part, you are going to learn how and when to use some of the advanced functions available in MySQL Shell.…


JKDB PLATFORM – our company’s data management platform

In this post, we introduce backup-restore module,focus on automatic backup and restore in a huge MySQL database environment.


Getting to know MySQL InnoDB cluster, the new kid in the block

InnoDB Cluster was released as GA a few weeks ago. I remember the initial announcement of the product at OOW 2016, promising a seamless solution for replication and high availability with great ease of use. I was a bit disappointed to see that, at GA release time, the InnoDB Cluster is a patchwork of three separate products (Group Replication, MySQL Router, MySQL Shell) which the users have to collect and install separately.

Given this situation, I was very pleased when Matthew Lord published Docker-InnoDB-Cluster, an image for Docker that contains everything you need to get the system up and running. The …

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Group Replication support SAVEPOINT

Group Replication has been around as GA for some months now. Nonetheless, work continues and now we are happy to let you know that you can now use transaction savepoints when write-set extraction is enabled.

This enhancement was released as in MySQL 8.0.1.…

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