Please join Percona’s Chief Evangelist, Colin Charles on Tuesday, June 26th, 2018, as he presents MariaDB Server 10.3 at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

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MariaDB Server 10.3 is out. It has some interesting features around system versioned tables, Oracle compatibility, column compression, an integrated SPIDER engine, as well as MyRocks. Learn about what’s new, how you can use it, and how it is different from MySQL.

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Colin Charles Chief Evangelist

Colin Charles is the Chief Evangelist at Percona. He was previously on the founding team of MariaDB Server in 2009, and had …

Percona announces the GA release of Percona XtraBackup 2.4.12 on June 22, 2018. You can download it from our download site and apt and yum repositories.

Percona XtraBackup enables MySQL backups without blocking user queries, making it ideal for companies with large data sets and mission-critical applications that …

MySQL Client / Server protocol is used in many areas. For example:

• MySQL Connectors like ConnectorC, ConnectorJ and etc.
• MySQL proxy
• Between master and slave

What is MySQL Client / Server protocol?

MySQL Client / Server protocol is accepted conventions (rules). Through these rules client and server “talks” and understand each other. Client connects to server through TCP connection with special socket, sends to server special packets and accepts them from server. There are two phases of this connection:

• Connection phase
• Command phase

Next illustration describes phases:

STRUCTURE OF PACKETS

Each packet consists of valuable data types. Maximum length of each packet can be 16MB. If the length of packet is more than 16MB, then it is separated into several chunks (16MB). First of all let’s see the protocol data types. …

I’m just back from a trip in Barcelona where I presented MySQL 8.0 InnoDB Cluster (at dataops and Barcelona MySQL Meetup) and the majority of feedback was great, but I also had some comments on the demos I showed. The first one was:

This is a joke of course (maybe it’s true for some), people found it very easy and they liked it.

But then, the second one was that all I showed wasn’t easy to find, some people who already played with the solution didn’t succeeded in creating a cluster so easily… not because they had errors or encountered bugs, but more because they just didn’t know how to do it.

The goal of this …

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

This is a short working week for me due to a family emergency. It caused me to skip speaking at DataOps.Barcelona and miss hanging out with the awesome of speakers and attendees. This is the first time I’ve missed a scheduled talk, and I received many messages about my absence. I am sure we will all meet again soon.

One of the talks I was planning to give at DataOps.Barcelona will be available as a Percona webinar next week: Securing Your Database Servers from External Attacks on Thursday, …

Orchestrator is a MySQL high availability and replication management tool. In this blog post, we will cover the first steps for getting started with it on an existing topology.

The code examples assume you are running Centos 7, but the general steps should be similar if you are running other operating system versions/flavors.

Prep work

1. Create a MySQL user on each of your database servers.
Orchestrator will connect with this user to discover the topology and to perform any changes you tell it to make.

CREATE USER 'orchestrator'@'%' IDENTIFIED BY '****';
GRANT SUPER, PROCESS, REPLICATION SLAVE, RELOAD ON *.* TO 'orchestrator'@'%';
GRANT SELECT ON mysql.slave_master_info TO 'orchestrator'@'%';
GRANT SELECT ON meta.* TO 'orchestrator'@'%';

Note: Orchestrator reads replication credentials stored in mysql.slave_master_info table, which implies you need to set up your servers with master_info_repository = …

Roles have been existing on many RDBMS for a long time by now. Starting from version 8.0, this functionality is finally there for MySQL.
The most important advantage is to define only once a role that includes a “set of permissions”, then assign it to each user, avoiding wasting time declaring them individually.

In MySQL, a role can be created like a user, but without the “identified by” clause and without login:

mysqld2-(root@localhost) [(none)]> CREATE ROLE 'r_sakila_read';
Query OK, 0 rows affected (0.03 sec)
mysqld2-(root@localhost) [(none)]> select user,host,authentication_string from mysql.user;
+------------------+-----------+------------------------------------------------------------------------+
| user             | host      | authentication_string                                                  |
+------------------+-----------+------------------------------------------------------------------------+
| …

In this blog, we will see the very basic thing “I” of “ACID” and an important property of Transaction ie., “ISOLATION”

The isolation defines the way in which the MySQL server (InnoDB) separates each transaction from other concurrent running transaction in the server and also ensures that the transactions are processed in a reliable way. If transactions are not isolated then one transaction could modify the data that another transaction is reading hence creating data inconsistency. Isolation levels determine how isolated the transactions are from each other.

MySQL supports all four the isolation levels that SQL-Standard defines.The four isolation levels are

• READ UNCOMMITTED
• READ COMMITTED
• REPEATABLE READ
• SERIALIZABLE

The Isolation level’s can be set globally or session based on our requirements.

Why do I spend time blogging about security frameworks? Because, although there are some resources available on the Web, none apply to Percona XtraDB Cluster (PXC) directly. Actually, I rarely encounter a MySQL setup where SELinux is enforced and never when Percona XtraDB Cluster (PXC) or another Galera replication implementation is used. As we’ll see, there are good reasons for that. I originally thought this post would be a simple “how to” but it ended up with a push request to modify the SST script and a few other surprises.

Some context

These days, with all the major security breaches of the last few years, the importance of security in IT cannot be highlighted enough. For that reason, …

We would like to take this moment to thank the Oracle company for continuous development of the popular MySQL database! As you all might know, Oracle has recently released  MySQL Server, v8.0. In its turn, Devart decided to get a move on and release the new dbForge Studio for MySQL, 8.0! Support for MySQL Server […]