MySQL has a long tradition in geographic replication. Distributing clusters to remote data centers reduces the effects of geographic latency by pushing data closer to the user. It also provides a capability for disaster recovery. Due to the significant cost of duplicating hardware in a separate site, not many companies were able to afford it in the past. Another cost is skilled staff who is able to design, implement and maintain a sophisticated multiple data centers environment.

With the Cloud and DevOps automation revolution, having distributed datacenter has never been more accessible to the masses. Cloud providers are increasing the range of services they offer for a better price.One can build cross-cloud, hybrid environments with data spread all over the world. One can make flexible and scalable DR plans to approach a broad range of disruption scenarios. In some cases, that can just be a backup stored offsite. In other cases, it can be a …

A really convenient feature in MySQL 8.0 is the ability to persist the values of global variables across server restarts, without writing them into an options file. This was developed primarily for the benefit of Cloud installations of MySQL, but is very handy for a DBA in on-premise installations too.

To use this feature you need to have the SYSTEM_VARIABLES_ADMIN and PERSIST_RO_VARIABLES_ADMIN privileges.

To demonstrate, we'll increase the value of the max_connections system variable from its default of 151 to 152 and then restart the MySQL server to check that MySQL remembers the new value.

mysql> SHOW GLOBAL VARIABLES LIKE 'max_connections'; +-----------------+-------+ | Variable_name | Value | +-----------------+-------+ | max_connections | 151 | +-----------------+-------+ 1 row in set (#.## sec)

Use SET PERSIST to persist the change that we're about to make:

mysql> SET PERSIST max_connections …

The MariaDB Foundation is pleased to announce the availability of MariaDB 10.2.15, the latest stable release in the MariaDB 10.2 series, and MariaDB Connector/J 2.2.4, the latest stable release in the MariaDB Connector/J 2.2 series. See the release notes and changelogs for details. Download MariaDB 10.2.15 Release Notes Changelog What is MariaDB 10.2? MariaDB APT […]

The post MariaDB 10.2.15 and MariaDB Connector/J 2.2.4 now available appeared first on MariaDB.org.

The MySQL Development team announced the General Availability of MySQL 8.0 on April 19th, 2018. Here we follow up with references to worklogs that were added in 8.0.11. Note the jump in version number from 8.0.4 (RC2) to 8.0.11 (GA) explained here.…

MariaDB Server 10.2.15 and Connector/J 2.2.4 now available dbart Fri, 05/18/2018 - 01:08

The MariaDB project is pleased to announce the immediate availability of MariaDB Server 10.2.15 and MariaDB Connector/J 2.2.4. See the release notes and changelogs for details and visit mariadb.com/downloads to download.

Download MariaDB Server 10.2.15

Release Notes Changelog What is MariaDB …

InnoDB Cluster is major revolution for MySQL Replication but it is often hard to test out new technologies without a major investment in time, hardware, and frustration.  But what if there was a quick and easy way to set up a test InnoDB Cluster?

SandboxThe details on how to set up a Sandbox InnoDB Cluster  is detailed at https://dev.mysql.com/doc/refman/8.0/en/mysql-innodb-cluster-sandbox-deployment.html but for those seeking a quick and dirty example please keep reading.

Step 1 - Fire up the MySQL Shell and Crate Sandbox Instances Start the MySQL shell and create a Sandbox instance. In this example we set up a sandbox instance at port 3310.
…

In reply to Marcelo Altmann.

Hi Marcelo.

Thanks for reply me..

We have resolved the isaue.

After disabling Selinux it’s got resolved.

MariaDB came into being the day that Oracle announced the purchase of Sun in 2010.  In order to keep it free under the GNU GPL, Michael Widenius forked MySQL and took several MySQL developers with him in the process.  Since then, MariaDB has been a drop-in replacement for MySQL, albeit with more features and better performance.

In the Improve MariaDB Performance using Query Profiling blog, we learned some useful techniques for tracking and analyzing slow queries using a couple of MariaDB server’s built-in tools: the Slow Query Log and the Performance Schema.  

The Slow Query Log records queries that are deemed to be slow and potentially problematic, that is, queries that take longer than the long_query_time global system variable value to run.

The Performance Schema is a storage engine …

MySQL, coupled with the InnoDB engine, provides full ACID compliance. With the addition of “eXtended Architecture” (XA) technology, they can all act in a distributed atomic environment.

In distributed systems, several different technologies, platforms and devices may need to act on separate sets of data atomically. These backend datasets can exist side by side in a datacenter, or across oceans. There can be multiple datasets where atomicity is a necessity. Foreign engines could completely control these datasets, with no concept of cross communication. The XA standard was specified by the Open Group to describe distributed transaction processing. This “eXtended Architecture” describes the relationship between a transaction manager and a transaction resource. You can find the specification HERE.

Transactions are:

• ATOMIC, committed as a …

While updating my class image to Fedora 27, I noticed that it installed the Akonadi Server. The documentation on the Akonadi server lacked some straightforward documentation. It also offered a bundled set of software that limited how to approach MySQL development.

So, I removed all those packages with the following syntax:

dnf remove `rpm -qa | grep akonadi`

After removing those Akonadi packages, I installed the MySQL Community Edition from the Fedora repo with this syntax:

yum install -y community-mysql*

Having installed MySQL Community Edition, I started the service with this command:

sudo service mysql start

Then, I ran the mysql_secure_installation script to secure the installation:

mysql_secure_installation

The script set the root user’s password, remove the anonymous user, disallow remote root login, and …