We’ll show you, how to secure LEMP stack. LEMP, it stands for Linux, (EngineX) NGINX, MariaDB (or MySQL) and PHP. Due to its flexibility and simplicity, NGINX slowly takes over the Internet. In this tutorial, we will attempt, through examples of bad and good practices, to go through the steps of properly securing your Linux web server. […]

We’ll show you, how to set up MySQL Cluster on Ubuntu. The MySQL NDB Cluster integrates the standard MySQL server with an in-memory clustered storage engine called NDB (Network DataBase). We will use a total of 4 virtual servers, one for the management, one SQL node and two data nodes: 172.16.1.1 – management VPS 172.16.1.2 […]

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The Madrid MySQL Users Group has its next meeting on Tuesday, 22nd November 2016.  Giuseppe Maxia will be giving a presentation MySQL document store: SQL and NoSQL united and I’ll be providing a brief summary of the new MySQL 8.0 and MariaDB 10.2 beta versions which were announced recently. There will also be an opportunity to … Continue reading MMUG16: MySQL document store: SQL and NoSQL united

The post MMUG16: MySQL document store: SQL and NoSQL united first appeared on Simon J Mudd's Blog.

    Recently we went through an exercise where we moved all of our database masters between data centers. We planned on doing this online with minimal user impact. Obviously when performing this sort of action there are a variety of considerations such as cache consistency and other pieces of shared state in stores like HBase, but the focus of this post will be primarily on MySQL.

    During this move we had a number of constraints. As mentioned above this was to be online when serving production traffic with minimal user impact. In aggregate we service hundreds of thousands of database queries per second. Additionally we needed to encrypt all data transferring between data centers. MySQL replication supports encryption, but connections to the servers themselves present several challenges. Specifically, from a performance standpoint the handshake to establish a connection across a WAN can impact latency if …

Oracle Open World 2016 has just finished in San Francisco and we are now about to embark on Percona Live Europe in Amsterdam. I offered a presentation in San Francisco on the MySQL X protocol, the new protocol that Oracle is using to make the DocumentStore work. This new protocol also allow you to send … Continue reading OOW16 talk – MySQL X protocol – Talking to MySQL directly over the Wire

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I was recently asked this question by an experienced academic at the NY Oracle Users Group event I presented at.

Does MySQL support ACID? (ACID is a set of properties essential for a relational database to perform transactions, i.e. a discrete unit of work.)

Yes, MySQL fully supports ACID, that is Atomicity, Consistency, Isolation and Duration. (*)

This is contrary to the first Google response found searching this question which for reference states “The standard table handler for MySQL is not ACID compliant because it doesn’t support consistency, isolation, or durability”.

The question is however not a simple Yes/No because it depends on timing …

Working with a client last week I noted in my analysis, “The mysql server was restarted on Thursday and so the [updated] my.cnf settings seems current”. This occurred between starting my analysis on Wednesday and delivering my findings on Friday.

# more /var/lib/mysql/ip-104-238-102-213.secureserver.net.err
160609 17:04:43 [Note] /usr/sbin/mysqld: Normal shutdown

The client however stated they did not restart MySQL and would not do that at 5pm which is still a high usage time of the production system. This is unfortunately not an uncommon finding, that a production system had an outage and that the client did not know about it and did not instigate this.

There are several common causes and the “DevOps” mindset for current production systems has made this worse.

• You have managed hosting and they perform software updates with/without your knowledge. I have for example worked with several Rackspace …

I posted recently Lossless RBR for MySQL 8.0 about a concern I have about moving to minimal RBR in MySQL 8.0.  This seems to be the direction that Oracle is considering, but I am not sure it is a good idea as a default setting. I talked about a hypothetical new replication mode lossless RBR and also about … Continue reading The differences between IDEMPOTENT and AUTO-REPAIR mode

The post The differences between IDEMPOTENT and AUTO-REPAIR mode first appeared on Simon J Mudd's Blog.

Lossless RBR TL/DR: There’s been talk of moving the next release of MySQL to minimal RBR: I’d like to suggest an alternative: lossless RBR For MySQL 5.8 there was talk / suggestions about moving to minimal RBR as the default configuration (http://mysqlserverteam.com/planning-the-defaults-for-mysql-5-8/).  I’m not comfortable with this because it means that by default you do not have … Continue reading Lossless RBR for MySQL 8.0?

The post Lossless RBR for MySQL 8.0? first appeared on Simon J Mudd's Blog.