Or should I say to: "not to get soaked"...

The Amsterdam weather forecasts for next week is out  and it does not look so good during Percona Live MySQL and NoSQL Conference:

Of course, this is not a problem during talks, and I take this opportunity to invite you to my talks:

Riding the Binlog: an in Deep Dissection of the Replication Stream(22 September 11:20AM - 12:10PM @ Matterhorn 3)

Recently Aphyr (Kyle Kingsbury) published https://aphyr.com/posts/327-call-me-maybe-mariadb-galera-cluster

The article is technically valid, I am not going to dispute a conclusion Aphyr made, but it is also quite technically involved, so users who just jump to conclusion may get the wrong impression and we’re left with more questions than ever.

So, let me state what is the real conclusion of this article:
“Galera cluster does not support SNAPSHOT ISOLATION LEVEL, in contract to what was stated in the documentation”.
Following that conclusion is using Galera cluster may result in “corrupted” data.

I do not quite like the usage of the word “corrupted” here. For me, the more correct word be to use is “inconsistent”.

So with this clarification, the …

Recently we encountered an issue with aurora, where our cpu started spiking every X minutes. (X < 30)

we had like 20-30 connections, out of which majority were inserts and a few selects.

every time the spike occurred our inserts would start waiting and waiting….

here is innotop output

we checked our code. nothing major had changed.

The mysql error log had this mysterious message which i could not trace in the mysql/percona/maria source.

“Innodb: Retracted crabbing in btr_cur_search_to_nth_level 33001 times since restart”

if you get to know the meaning of this – please do let me know – would love to understand this.

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Getting new t-shirts printed as give-aways for the much anticipated Percona Live Europe Conference in Amsterdam next week is not unlike creating and spinning up lots of MySQL instances. Some might prefer to do so themselves, manually, while others will look at automating most of the required steps (as it takes quite a bit of time to produce 100s of t-shirts by hand …). 

Given the database automation & management folks that we are at Severalnines, we went for automation ;-)

First you need to design the schema: 

Then build your first instance: 

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Thanks to all who attended my webinar Introduction to MySQL SYS Schema. This blog is for me to address the extra questions I didn’t have time to answer on the stream.

Can i have the performance_schema enabled in 5.6 and then install the sys schema? Or they are one and the same?

You need to have enabled the performance_schema in order to use it through the sys schema. They are different entities. In general, performance_schema collects and stores the data, and sys schema reads and presents the data.

The installation of sys schema on primary database will be replicated to the slaves?

By default, no. If you wish that the Sys Schema replicates to the slaves, you can modify the before_setup.sql ( …

Over the years, MySQL has used three different mechanisms for securing passwords both for storage and for transmission across networks. This blog post aims to provide a brief history of the various mechanisms and highlight reasons to migrate accounts to use the sha256_password mechanism introduced in MySQL Server 5.6.…

Ever get called out for a MySQL issue only to realize that there was no issue?  It was a false alarm from the monitor.  We sure have and it’s frustrating, especially at 3:00 or 4:00 in the morning!

Many DBAs work in an environment where there is some sort of first level support that gets assigned tickets first.  Unfortunately, many of the times these groups are, shall we say, less than skilled in MySQL.  As a result, they quickly escalate the ticket onto the primary on-call DBA, even when there is really nothing wrong.

Much of the time, there are multiple types of MySQL topology in these environments: standalone, galera cluster, replication, etc.  Writing large runbooks with detailed test cases can be a daunting process and one that will cause many first-level support engineers to give up and simply escalate the issue anyway.

In an effort to avoid undue call outs, we developed a simple bash …

In the previous blog post we setup a replication topology with one master and 2 slaves, and we installed proxysql on a forth servers where the application should connect to.
The post was quite long, and we covered several topics, from installation and configuration of the cluster to installation of proxysql and creation of users and backends, from configuration of query rules for routing and their statistics to monitoring module and replication lag.

But ProxySQL can do more than this.
Among the most interesting features of proxysql is the ability to hold traffic until a backend is available (within a configurable time limit).
For instance, if a query should be send to hostgroup 0 but there is no servers in hostgroup 0, ProxySQL will wait until a server is available in hostgroup 0 or a timeout expires.

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Percona is glad to announce the release of Percona Server 5.6.26-74.0 on September 15, 2015. Download the latest version from the Percona web site or from the Percona Software Repositories.

Based on MySQL 5.6.26, including all the bug fixes in it, Percona Server 5.6.26-74.0 is the current GA release in the Percona Server 5.6 series. Percona Server is open-source and free – …

Hi all, keeping our steady release cycle, it is time again to do another preview release of MySQL Group Replication, the plugin that brings multi-master update everywhere to MySQL, like we described in Hello World post.

We are very proud to do the fourth preview release of MySQL Group Replication, version 0.5.0 based on MySQL Server 5.7.8, which introduces new exciting features, please enjoy the highlights!…