A master/slave replication cluster setup is a common use case in most organizations. Using MySQL Replication enables your data to be replicated across different environments and guarantees that the information gets copied. It is asynchronous and single-threaded (by default), but replication also allows you to configure it to be synchronous (or actually “semi-synchronous”) and can run slave thread to multiple threads or in parallels.

This idea is very common and usually arrives with a simple setup, making its slave serving as its recovery or for backup solutions. However, this always comes to a price especially when bad queries (such as lack of primary or unique keys) are replicated or some …

Hi Sakthi,
Thanks, it’s very helpful for me to troubleshoot at emergency situation

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Last week, we had two exceptional preFOSDEM MySQL Days in Brussels. A lot of MySQL Engineers presented their work but also different MySQL Users. I will publish soon an overview of the two days, but today let me share with you an interview I did with Giedrius Jaraminas, engineering manager of MySQL team in Uber.

“MySQL is heart of the Uber infrastructure“, this is how Giedrius started his presentation “Group Replication in Uber“.

The interview:

Q1: Tell us about yourself, and your experience with  MySQL

A1:  I am a database guy for 28 years, but I am relatively new to MySQL – I am a manager of MySQL team for only 3.5 years.

Q2:  Tell us about your company, and how MySQL is used.

A2:  MySQL is the main offer as a relational database, also – it is used as the …

This blog is the first part of a two-articles series. In this article, I’m going to introduce the Common Table Expression (CTE), a new feature available on MySQL 8.0, as well as Percona Server for MySQL 8.

What is a Common Table Expression?

We can define a CTE as an alternative to a derived table. In a small way, CTE simplifies complex joins and subqueries, improving the readability of the queries. CTE is part of ANSI SQL 99 and was introduced in MySQL 8.0.1. The same feature is available even on Percona Server for MySQL 8.0.

The main reasons for using CTE are:

• Better readability of the queries
• Can be referenced multiple times in the same query
• Improved performance
• A valid alternative to a VIEW, if your user cannot create VIEWs
• Easier chaining of multiple CTE …

Wix Engineering’s meetups focus on deep technical insights, whether it’s front-end, back-end, mobile, testing or anything in between. You can join us on Tel-Aviv, Kyiv, Dnipro and Vilnius.

Below you’ll find videos from one of our recent meetups, where our Baruch Assif Osoveksiy and Lior Altarescu, shared their work with NoSQL in a SQL Database, and MySQL JSON Data Type and Migration.

Working with NoSQL in a SQL Database (XDevApi) / Lior Altarescu

The X Dev API is a new protocol for non-blocking, asynchronous calls to MySQL.

In this talk, Lior explores the benefits of working with this …

Through the courtesy of Intel I have access to a machine with 6 TB of Intel
Optane DC Persistent Memory. This is memory that can be used both as
persistent memory in App Direct Mode or simply used as a very large
DRAM in Memory Mode.

Slides for a presentation of this is available at slideshare.net.

This memory can be bigger than DRAM, but has some different characteristics
compared to DRAM. Due to this different characteristics all accesses to this
memory goes through a cache and here the cache is the entire DRAM in the
machine.

In the test machine there was a 768 GB DRAM acting as a cache for the
6 TB of persistent memory. When a miss happens in the DRAM cache
one has to go towards the persistent memory instead. The persistent memory
has …

Nice post!

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• Are thinking the table fragmentation will be happened with only DELETE’s ?
• Do you believe the INSERT’s will also cause the table fragmentation ?

Yes, INSERT’s with the ROLLBACK can also create the table fragmentation . In this blog I am going to explain how the INSERT is causing the table fragmentation .

How the table fragmentations is happening with INSERT and ROLLBACK ?

When you triggered the INSERT, it will start to write the data into it’s table space file ( .ibd ) . Right ?

From the snap, I have created the table and started the transaction ( BEGIN ) with INSERT . Within the transaction the INSERT has been completed but still I did not commit / rollback the transaction .

You can check the table space file growth to 1.2 GB .

Now, I am going to rollback the transaction .

After the ROLLBACK completed, still the …

As our Percona Kubernetes Operator for Percona XtraDB Cluster gains in popularity, I am getting questions about its performance and how to measure it properly. Sysbench is the most popular tool for database performance evaluation, so let’s review how we can use it with Percona XtraDB Cluster Operator.

Operator Setup

I will assume that you have an operator running (if not, this is the topic for a different post). We have the documentation on how to get it going, and we will start a three-node cluster using the following cr.yaml file:

apiVersion: pxc.percona.com/v1-3-0
kind: PerconaXtraDBCluster
metadata:
  name: cluster1
  finalizers:
    - delete-pxc-pods-in-order
spec:
  secretsName: my-cluster-secrets
  sslSecretName: …

Just when we thought that IT and cloud terminology couldn’t get any more confusing, a new term was coined to seemingly simplify it all: hybrid cloud.

As is often the case, one cloud doesn’t fit all, and over the past few years, IT teams around the globe have realized that combining the capabilities of various public clouds (aka multi-cloud) with on-premises private clouds (aka hybrid cloud) enables organizations to tailor their technology environments to match their business drivers more effectively.

In fact, many predicted in 2019 that hybrid cloud would be the future (as opposed to multi-cloud) and it is increasingly looking that way.

“2019 will be the year cloud customers start to abandon the notion of multi-cloud and anchor on a hybrid-cloud future involving a mix of on-premise services, often enabled or augmented by services from their preferred cloud provider, and managed cloud services.” – …