In the first delivery of this series of posts, delivered for whom who are interested to understand the basics of MySQL Cluster "by examples", I wrote about installing MySQL Cluster with a python utility called ndb_setup-py, which offers a nice web graphical interface to define and start our brand new cluster.

In this post I will share an example to do everything from scratch and manually, instead. Doing things manually is always the best recommendation to learn everything about processes life cycle through their:

• Initialization
• Administration (start/stop/reconfigure)
• Monitoring (logs/counters/status)
• Troubleshooting 

The resulting topology …

In the first delivery of this series of posts, delivered for whom who are interested to understand the basics of MySQL Cluster “by examples”, I wrote about installing MySQL Cluster with a python utility called ndb_setup-py, which offers a nice web graphical interface to define and start our brand new cluster.

In this post I will share an example to do everything from scratch and manually, instead. Doing things manually is always the best recommendation to learn everything about processes life cycle through their:

• Initialization
• Administration (start/stop/reconfigure)
• Monitoring (logs/counters/status)
• Troubleshooting 

The resulting topology I’d like to setup is composed of 2 data …

Introduction In software terminology, multitenancy is an architectural pattern which allows you to isolate customers even if they are using the same hardware or software components. Multitenancy has become even more attractive with the widespread adoption of cloud computing. A relational database system provides a hierarchy structure of objects which, typically, looks like this: catalog … Continue reading A beginner’s guide to database multitenancy →

The post A beginner’s guide to database multitenancy appeared first on Vlad Mihalcea.

In our work, We used to get a lot of requirements for replicating data from one data source to another. Our team provided solutions to replicate data from MySQL to Vertica, Amazon Redshift, Hadoop. Out of which Amazon Redshift replication is a bit complicated as Amazon Redshift is a Database as a service (DBaaS) and the process is not straightforward.

So, I take this opportunity to guide on how to replicate the specific set of tables from MySQL to AWS Redshift using Tungsten replicator.

1.0. Tungsten Replicator:

Tungsten Replicator is an open source replication engine supports data extract from MySQL, MySQL Variants such as RDS, Percona Server, MariaDB and Oracle and allows the data extracted to be applied on other data sources such as Vertica, Cassandra, …

Dear MySQL users,

MySQL Connector/ODBC 5.3.11, a new version of the ODBC driver for the
MySQL database management system, has been released.

The available downloads include both a Unicode driver and an ANSI
driver based on the same modern codebase. Please select the driver
type you need based on the type of your application – Unicode or ANSI.
Server-side prepared statements are enabled by default. It is suitable
for use with any MySQL version from 5.5.

This is the fifth release of the MySQL ODBC driver conforming to the
ODBC 3.8 specification. It contains implementations of key 3.8
features, including self-identification as a ODBC 3.8 driver,
streaming of output parameters (supported for binary types only), and
support of the SQL_ATTR_RESET_CONNECTION connection attribute (for the
Unicode driver only).

The release is now available in …

Please join Percona’s CEO, Peter Zaitsev as he presents Using MySQL for Distributed Database Architectures on Tuesday, July 31st, 2018 at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

Register Now

In modern data architectures, we’re increasingly moving from single-node design systems to distributed architectures using multiple nodes – often spread across multiple databases and multiple continents. Such architectures bring many benefits (such as scalability and resiliency), but can also bring a lot of pain if incorrectly designed and …

In this blog post, we talk about what happened during an installation of the Tungsten Cluster into an environment with SELinux running and mis-configured.

An attempt to execute `tpm install` on v5.3.2 recently failed with the below error:

ERROR >> node3_production_customer_com >> Unable to run 'sudo systemctl status mysqld.service' or the database server is not running (DatasourceBootScriptCheck) 
Update the /etc/sudoers file or disable sudo by adding --enable-sudo-access=false 

Worse, this customer reported that this appeared as a WARNING only in Dev and Staging tests. So we checked, and it seemed we were able to access systemctl properly:

shell> sudo systemctl status mysqld.service
● mysqld.service - MySQL Percona Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: activating (start-post) since Tue 2018-06-19 17:46:19 BST; 1min 15s ago …

This blog will go into how to manage multiple MySQL binary installations with SYSTEMD using the systemctl command.  With package installations of MySQL using YUM or APT, it’s quick and easy to manage your server’s state by executing systemctl commands to stop, start, restart, and status.  But what do you do when you want to install MySQL using the binary installation with a single or with multiple MySQL instances? You can still use SYSTEMD to easily manage the MySQL instances. All commands and testing have been done on Debian, and some details may change in other distro’s.

MySQL preparation

These are the steps to set up MySQL with multiple instances. If you currently have a MySQL server package installation using YUM or APT, it will need to be removed first. Make sure you keep your client. I also had to install some base packages for MySQL on Debian

apt install libaio1 libaio-dev numactl

…

The previous release of MySQL Connector 8.0.11 caused confusion for many users because its lack of support for Windows 32-bit platform, which is still very popular.

The main reason for it was the change in the MySQL Server 8.0 and MySQL client 8.0 library design, which regarded the Windows 32-bit platform as obsolete. Unfortunately, it had a far reaching adverse impact on the family of MySQL Connectors based on libmysqlclient including MySQL Connector/ODBC.

We listened to the voice of the community and did our best to bring back the 32-bit ODBC Driver for Windows to allow using it in ASP, VB, 32-bit MS Office applications etc.

Now we are happy to announce the return of the fully featured 32-bit version of ODBC Driver 8.0 for Windows with the full support for MySQL Server 8.0. The community version of the driver will soon be available for public at the following address:

…

Windowing functions are a critical tool for grouping rows of data that are related to other rows. But they go far beyond the regular aggregate functions found in MySQL 5.7 and earlier. In MySQL 8 you do not have to collapse all the information down into a single output row. Each row can retain its individual identity but the server can analyze the data as a unit.
Statistics and Damned Lies Finding the total Population of the District Texas from the world.city table is simple. 

SQL> select District, sum(Population)  
from city where district = 'Texas';
+----------+-----------------+
| District | sum(Population) |
+----------+-----------------+
| Texas    |         9208281 |
+----------+-----------------+
1 row in set (0.0068 sec)




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