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Setting up MySQL Cluster in the Oracle Bare Metal Cloud

The Oracle Bare Metal Cloud service is an innovative cloud service.
When looking at how it can be used for MySQL Cluster it is a great

MySQL Cluster is a high availability solution. Oracle Bare Metal Cloud
provides the possibility to have servers that only you use and thus
two Oracle Bare Metal servers are definitely independent of each others
hardware. If you want to also run synchronous replication with no
dependence on network, housing and electricity you can place these
servers in different availability domains in the same region.
Thus it is possible to build individual clusters with very high

It is still possible to use smaller virtual machines that share the
machine with other simultaneous users.

One of the most important features of MySQL Cluster is predictable
latency. To achieve this it is …

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MySQL Performance: 8.0-dev Progress..

As you already know, a new MySQL-8.0 milestone release is available (and hope you did not miss all the news coming from MySQL Server Team site - starting by what's new article and followed by many others (and you'll see yet more to come ;-))..

There are also many good changes improving overall MySQL 8.0 Performance. However to see a real boost on OLTP workloads you'll need to have little bit more of patience.. -- we're attacking InnoDB fundamentals.. -- the parts of design which are probably remained mostly unchanged since InnoDB creation ;-)) -- you can easily understand that such a work has a long road from idea/ prototype to a final release.. On the same time our "Preview" results are looking very encouraging, and I'll be happy to say you more about during my talk …

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Setting up a MySQL Cluster in the Cloud

In my previous post I covered how to install MySQL Cluster on
a Red Hat VM.

In order to run MySQL Cluster in a cloud environment I use 4 VMs.
This is sufficient for a demo or proof of concept of MySQL Cluster.
For a production environment it is likely that one would want at least
6 VMs. It is generally a good idea to use one VM per process.
This has the advantage that one can perform an upgrade in the
order suitable for upgrading MySQL Cluster.

I used one VM to handle the NDB management server. When this
node is down no new nodes can join the cluster, but living nodes
will continue to operate as normal. So in a demo environment it
is quite sufficient to use 1 NDB management server. In a production
environment it is quite likely that one wants at least two
management server VMs.

I used two VMs for data nodes. This is the …

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Installing MySQL Cluster 7.5.6 on Red Hat derivatives

MySQL Cluster 7.5.6 comes with a new nice feature. It is now possible
to install MySQL Cluster using the MySQL repos. I made an exercise today
in setting up a cluster today in the cloud using these new
MySQL repos. This blog describes the work to install MySQL Cluster
on the VMs.

I set up the cluster using 4 different VMs. I used the standard free
t1.micro instances, the aim was to test an installation, not to actually
make anything useful work. For that one would most likely want a bit
fatter VMs. I used Red Hat 7.3 as the OS for the VMs.

So after creating the 4 VMs I ssh:ed into each one. The first step
needed is to ensure that the Linux instance knows about the MySQL repos.
I went to to download the
small RPM needed for this. …

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TokuDB Troubleshooting: Q & A

In this blog, we will provide answers to the Q & A for the TokuDB Troubleshooting webinar.

First, we want to thank everybody for attending the March 22, 2017 webinar. The recording and slides for the webinar are available here. Below is the list of your questions that we were unable to answer during the webinar:

Q: Is it possible to load specific tables or data from the backup?

A: Do you mean the backup created by TokuBackup? No, this is not possible. You have to restore the full backup to a temporary instance, then perform a logical …

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Install and configure a corporate Open Source Booking System on Centos 7

In today's business, it is increasingly necessary to share workspaces, labs, tools, and any other type of resources. Making the most of the available resources has become a competitive advantage for modern businesses. Booked is open source software written in PHP and MySQL that helps organizations and groups efficiently manage, record and track resources of any kind. It allows you to create schedules so users can find schedules available for resource use.

Percona Live Featured Session with Wei Hu – AliSQL: Breakthrough for the Future

Welcome to another post in the series of Percona Live featured session blogs! In these blogs, we’ll highlight some of the session speakers that will be at this year’s Percona Live conference. We’ll also discuss how these sessions can help you improve your database environment. Make sure to read to the end to get a special Percona Live 2017 registration bonus!

In this Percona Live featured session, we’ll meet Wei Hu, Staff Engineer at Alibaba. His session (along with co-presenter Dengcheng He, Senior Staff Engineer at Alibaba) is AliSQL: Breakthrough for the Future. AliSQL is a MySQL …

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MySQL 8.0.1: Accent and case sensitive collations for utf8mb4

In MySQL 8.0 we have been working to improve our support for utf8 as we make the transition to switch it to the default character set.  For more details see our earlier posts:

In today’s post I wanted to describe the improvements to support accent and case sensitive collations.…

MySQL read/write split with ProxySQL

Query routing is one of the core features of ProxySQL.
Read/write split is perhaps one of the most common query routing use, while the other most commonly used query routing implementation is for sharding.
In this blog post I will show some example on how to implement read/write split.

Read/write split using different ports

If you are using a proxy like HAProxy you can configure it to listen onto two ports: one as an endpoint for writes, while the second port as an endpoint for reads.
People has often asked how to configure ProxySQL using the same approach, and routing queries based on incoming port.

Here is an example on how to implement query routing based on incoming port, running the follow on ProxySQL's Admin. I will assume you already have master and slaves configured in the right hostgroups: MySQL writer in hostgroup 10, and MySQL readers in hostgroup 20. A similar approach will apply if you are …

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Another Hanging Query

You are a DBA, enjoying a good read about the MySQL 8.0.1 development milestone release which contains CTEs.  And, window functions are coming in 8.0.2. Perhaps, you think, the analytics team could make good use of window functions to perform rankings on the sales of products compared to the average sales for all the products.

Dreaming about the possibility of trying CTEs in 8.0.1, you get a phone from a user complaining that her ‘SELECT’ statement has been running for a long time.

Fortunately, you have the MySQL Enterprise Monitor (MEM) which is part of the MySQL Cloud Service (MySQLCS).  You have recently set up your MySQL database in MySQLCS where you have installed MEM.

You login to your identity domain in MySQLCS and select you service and click the pull-down menu choice ‘Enterprise Monitor URL’:

After logging in, you notice on the MEM dashboard that there is a spike in database activity …

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