The latest from the MySQL community

Or Fun in using MySQL8 with ProxySQL and MysqlJ connector

I am recently working on testing MySQL8 and try the several solution attach to it,like ProxySQL but not only.

After I had setup the set of servers, and configured ProxySQL to redirect the incoming connection from my user m8_test to my MySQL8 setup, I had turn on my Java test application ... and with my surprise I received an error:

Caused by:

1

      com.mysql.cj.core.exceptions.CJException: Unknown system variable 'query_cache_size'

Well ok MySQL8 doesn't have Query cache, but why I got this error?

I did point the application to MySQL8 directly and it worked fine.

Just to be sure this is something restricted to the Java connector, I did a test with a perl, and I was able to access and …

The FOSSASIA Summit is an annual conference on open technologies and society. The event offers lectures and workshops and various events on a multitude of topics.

MySQL-world's most popular open source database, has been registering its presence in FOSSASIA since 2014. Developers (like me), who play daily with MySQL source code, go there and share their knowledge about new features and various other topics related to MySQL.

Last year in 2017, we had a full day dedicated to MySQL talks/workshop which was attended by very serious users/customers of MySQL. We also had 'bird-of-a-feather' session in which customers/users got a chance to have in-depth discussion directly with developers on various topics of interest. And it was very much appreciated/enjoyed by both, customers/users as well as we developers.

This year, in 2018, again we are ready to register our presence in …

Our clients operate on a variety of platforms, and RDS (Amazon Relational Database Service) Aurora has received quite a bit of attention in recent times. On behalf of our clients, we look beyond the marketing, and see what the technical architecture actually delivers.  We will address specific topics in individual posts, this time checking out what the Aurora architecture means for write and caching behaviour (and thus performance).

What is RDS Aurora?

First of all, let’s declare the baseline.  MySQL Aurora is not a completely new RDBMS. It comprises a set of Amazon modifications on top of stock Oracle MySQL 5.6 and 5.7, implementing a different replication mechanism and some other changes/additions.  While we have some information (for instance from the “deep dive” by AWS VP Anurag Gupta), the source code of the Aurora modifications …

In this blog post, I will talk about archiving MySQL tables in ClickHouse for storage and analytics.

Why Archive?

Hard drives are cheap nowadays, but storing lots of data in MySQL is not practical and can cause all sorts of performance bottlenecks. To name just a few issues:

1. The larger the table and index, the slower the performance of all operations (both writes and reads)
2. Backup and restore for terabytes of data is more challenging, and if we need to have redundancy (replication slave, clustering, etc.) we will have to store all the data N times

The answer is archiving old data. Archiving does not necessarily mean that the data will be permanently removed. Instead, the archived data can be placed into long-term storage (i.e., AWS S3) or loaded into a …

At Mydbops we always thrive to provide the best MySQL Solutions. We are exploring the modern SQL load balancers. We have planned to write a series of blog on ProxySQL.

The first blog in this series is  how to set up ProxySQL for MySQL Replication Topology including Read / Write Split and some background over ProxySQL.

What is ProxySQL ?

• ProxySQL is a open-source high-performance SQL aware proxy. It runs as a daemon watched by a monitoring process.
• ProxySQL seats between application and db servers.
• The daemon accepts incoming traffic from MySQL clients and forwards it to backend MySQL servers.

A few most commonly used features are : …

I received many request about MySQL High Availability Architecture. There are a lot of tools, but how can we use them to achieve MySQL HA without over engineering everything.

To answer such demand, there is no generic architecture, of course there are leaders in solutions, but put them together can result in many different designs, I will start a series of article on that topic. Feel free, as usual to comment, but also recommend other tools that could be used in a future post.

So today’s post is related to MySQL InnoDB Cluster with Hashicorp’s Consul.

Architecture

This is the overview of the deployed architecture:

As you can see, we have 3 data centers, but in fact we have only two DCs on premises and one in the cloud. A large amount of request are always …

I am happy that the MySQL team is, during the last years, blogging about each major feature that MySQL Server is getting; for example, the series on Recursive Common Table Expressions. Being extremely busy myself, …

Percona announces the GA release of Percona Server for MySQL 5.7.21-20 on February 19, 2018. Download the latest version from the Percona web site or the Percona Software Repositories. You can also run Docker containers from the images in the Docker Hub repository.

Based on MySQL 5.7.21, including all the bug fixes in it, Percona Server for MySQL 5.7.21-20 is the current GA release in the Percona Server for MySQL 5.7 series. Percona …

Hello ,
I have two production servers worth around 100 GB.I have to setup multi-source replication to a single slave for these servers.My preferable method of backup is percona xtrabackup or enterprise backup.Could you please guide how can i restore the backup to from these two master servers to the slave ?

In this blog post, we’ll look at how ZFS affects MySQL performance when used in conjunction.

ZFS and MySQL have a lot in common since they are both transactional software. Both have properties that, by default, favors consistency over performance. By doubling the complexity layers for getting committed data from the application to a persistent disk, we are logically doubling the amount of work within the whole system and reducing the output. From the ZFS layer, where is really the bulk of the work coming from?

Consider a comparative test below from a bare metal server. It has a reasonably tuned config (discussed in separate post, results and scripts here). These numbers are from sysbench tests on hardware with six SAS drives behind a RAID controller with a write-backed cache. Ext4 was configured with RAID10 softraid, while ZFS …