In MySQL Cluster 8.0.20 a new feature was added that enables higher write rates

in NDB Cluster. In previous releases the communication between nodes in the same

node group was handled by one socket. This single socket was able to handle about

200-300 MBytes of write traffic between the replicas inside one node group. Thus

in clusters with many node groups the write rates can be much higher.

For most applications this doesn't represent any problem at all. However there are

certain applications that require wast amount of writes.

One such application is when NDB is used to store file data. File writes can easily

go beyond 200-300 MBytes per second. Another application is when NDB is used to

store data from measurements, stock data or other applications that require millions of

writes per second.

…

MySQL 8.0 Performance Benchmarking on Amazon EC2 The scope of performance benchmarking

The core objective of this benchmarking exercise is to measure MySQL 8.0 performance, This include INSERTs , SELECTs and complex transaction processing (both INSERTs and SELECTs) without any tuning of MySQL 8 instance’s my.cnf. We agree tuning my.cnf will greatly improve performance but in this activity we wanted to benchmark MySQL 8 transaction processing capabilities and technically in MinervaDB we measure performance by Response Time and believe you can build high performance MySQL applications by writing optimal SQL. We have used Sysbench (https://github.com/MinervaDB/MinervaDB-Sysbench release 1.0.20) for this benchmarking activity. This is not a paid / sponsored benchmarking effort by any of the software or hardware vendors, We will remain …

MySQL 8.0 has been with us already for quite some time and many MySQL users have already upgraded to this version. For those who are still using older MySQL versions, we would like to present this blog where we will share some tips and information that help in the upgrade process for MySQL 8.0.

Mind Your Version

Software versions are quite important in the upgrade process. For starters, only one major version difference is supported. You have to be running MySQL 5.7 before you can upgrade to MySQL 8.0. This is quite important to keep …

Watch our MySQL Database Service racing car compete in Forza Horizon 4, the racing car video game developed by Playground Games and published by Microsoft Studios. 

Special thanks go to Shumber Rivera from Mazatlan in Mexico.  Shumber is a MySQL fan and an avid car racer on Forza Horizon 4.  So, when he approached us with his idea of reproducing our real McLaren MySQL Database Service racing car for a video game racing car, we immediately thought that it was a cool idea.

Shumber made it happen.  He is now racing the Oracle MySQL Database Service car and is our official driver on FH4….as long as he wins of course. 

By the way, we really like how he kicks the competition to get ahead.  That’s the spirit!

Go Shumber!  Go MySQL Database Service!

Watch our MySQL Database Service racing car compete in Forza Horizon 4, the racing car video game developed by Playground Games and published by Microsoft Studios. Special thanks go to Shumber Rivera from Mazatlan in Mexico. Shumber is a MySQL fan and an avid car racer on Forza Horizon 4. So, when h...

Hello everyone, in this little post we will review a new feature in MySQL 8.

What is “CHECK Constraint”?

This is a new feature to specify a condition to check the value before INSERT or UPDATE into a row. The constraint could return an error if the result of a search condition is FALSE for any row of the table (but not if the result is UNKNOWN or TRUE).

This feature starts working on MySQL 8.0.16, and in previous versions, we could create it, but it doesn’t work, meaning the syntax is supported but it is not working,

There are some rules to keep in mind…

– AUTO_INCREMENT columns are not permitted
– Refer to another column in another table is not permitted
– Stored functions and user-defined functions are not permitted (you can not call a function or any user-defined functions)
– Stored procedure and function parameters are not permitted (you cannot call …

Maybe one of the more “obscure” operations when dealing with replica lag, or, in general, when one needs to control writes to the database, is the Rate limit. It’s also lately one of the most popular conversations around the community.

But what is it? In plain words: holding up queries for a while, giving air to the replicas to breath and catch up. Something similar to the Galera’s Flow Control mechanism, although flow control, when it kicks in, stops all the writes while the nodes catch up. With a throttle no write is stopped, just delayed.

There are several ways to do this. A popular tool is Freno but this is also something that can be achieved with ProxySQL. Let’s see how.

Delay

ProxySQL has a variable called …

Watch the replay of this webinar about geo-distributed active/active MySQL replication for Financial Services SaaS Providers and on how to guarantee credit card transaction availability with geo-distributed Tungsten MySQL clusters.

Tags:  Webinar MySQL use case tungsten clustering mysql cluster bluefin MySQL Replication …

We look at some basics and follow up to present scenarios that require higher level intervention to ensure availability and to avoid split brains from taking place.

Read the full story

MySQL semi-sync is a plugin mechanism on top of asynchronous replication, that can offer better durability and even consistency (term defined later). It helps in high availability solutions, but can in itself reduce availability. We look at some basics and follow up to present scenarios that require higher level intervention to ensure availability and to avoid split brains from taking place. I recommend reading this semi-sync blog post by Jean-François Gagné (aka JFG), which illustrates the internals of the semi-sync implementation, and debunks some myths about semi-sync. We will overlap a bit with another recommended post by JFG, about high availability and recovery. Note: in this post we adopt the term “primary” over the term “master” in the context of MySQL replication. However, at this time there is no alternative to using the actual names of some configuration and status variables that use “master” terminology, and some duality is …