Ever wondered how hosting companies manage their MySQL database architecture? At Hostinger, we have various MySQL setups starting from the standalone replica-less instances to Percona XtraDB Cluster (later just PXC), ProxySQL routing-based and even absolutely custom and unique solutions which I’m going to describe in this blog post.

We do not have elephant-sized databases for internal services like API, billing, and clients. Thus almost every decision ends up with high availability as a top priority instead of scalability.

Still, scaling vertically is good enough for our case, as the database size does not exceed 500GB. One and the top requirements is the ability to access the master …

Schema change is one of the crucial tasks in MySQL with huge tables. Schema change can cause locks.

What is gh-ost?

                         gh-ost is a triggerless online schema change for MySQL by Github Engineering .It produces light workload on the master during the schema changes . We need online schema change to alter a table without downtime (locking) in production.pt-online schema change is the most widely used tool for making changes in the tables.gh-ost is just an alternative to pt-online schema change.

Why we have to use gh-ost?

…

What excites me is the possibility that this tool is giving to other people. Also, the challenges I’ve faced and the new ideas for the future releases are always source of interest that keep me focused on the project. So I’m looking forward to sharing this with the conference delegates.

pg_chameleon can achieve two tasks in a very simple way. It can setup a permanent replica between MySQL and PostgreSQL, giving the freedom of choice for the right tool for the right job, or can migrate multiple schemas to a PostgreSQL database.

Anybody that want to extend their database experience, taking the best of the two worlds, or who is seeking a simple way to migrate data with minimal downtime will find the presentation interesting.

What else am I looking forward to at Percona Live Europe?

I’m …

There are a number of options for generating ID values for your tables. In this post, Alexey Mikotkin of Devart explores your choices for generating identifiers with a look at auto_increment, triggers, UUID and sequences.

AUTO_INCREMENT

Frequently, we happen to need to fill tables with unique identifiers. Naturally, the first example of such identifiers is PRIMARY KEY data. These are usually integer values hidden from the user since their specific values are unimportant.

When adding a row to a table, you need to take this new key value from somewhere. You can set up your own process of generating a new identifier, but MySQL comes to the aid of the user with the AUTO_INCREMENT column setting. It is set as a column attribute and allows you to generate unique integer identifiers. As an example, consider the …

For Percona Live Europe, I’ll be presenting the tutorial Elasticsearch 101 alongside my colleagues and fellow presenters from ObjectRocket Alex Cercel, DBA, and Mihai Aldoiu, Data Engineer. Here’s a brief overview of our tutorial.

Elasticsearch® is well known as a highly scalable search engine that stores data in a structure optimized for language based searches but its capabilities and use cases don’t stop there. In this tutorial, we’ll give you a hands-on introduction to Elasticsearch and give you a glimpse at some of the fundamental concepts. We’ll cover various administrative topics like …

In this post, I provide an illustration of how to use Pentaho Data Integration (PDI) tool to set up external dictionaries in MySQL to support ClickHouse. Although I use MySQL in this example, you can use any PDI supported source.

ClickHouse

ClickHouse is an open-source column-oriented DBMS (columnar database management system) for online analytical processing. Source: wiki.

Pentaho Data Integration

Information from the Pentaho wiki: Pentaho Data Integration (PDI, also called Kettle) is the component of Pentaho responsible for the Extract, Transform and Load (ETL) processes. Though ETL tools are most frequently used in data warehouses environments, PDI can also be used for other purposes:

• Migrating data between …

This is the 5th blog in series of Maxscale blog, Below is the list of our previous blogs, Which provides deep insight for Maxscale and its use cases for different architectures.

• Scale with Maxscale part -1 (Intro & Galera Cluster)
• Scale with Maxscale part – 2 (Administration, Installation & operation)
• Scale with Maxscale part – 3 (Replication M-S)
• …

The schema changes in production can cause lock at time and makes the slave to lag. It is more tedious and troublesome with PXC ( Galera ) cluster which can be made smoother with Percona online schema change.

Image Courtesy : Photo by Andrew Ruiz on Unsplash

This is our second blog in the ProxySQL Series ( Blog I MySQL Replication Read-write Split up ). Will cover how to integrate ProxySQL with MHA to handle failover of Database servers.

We already have Master – Slave replication setup behind ProxySQL from previous blog [ProxySQL On MySQL Replication]

For this setup we have added one more node for MHA Manager , Which will keep eye on Master and Slave status.

• node5 (172.17.0.5) , MHA Manager

ProxySQL can be greatly configured with MHA for …

This presentation was made at LSPE event in Bangalore (India) held at Walmart labs on 10-03-2018. This presentation focuses how we have harnessed the power of Ansible at Mydbops.