This is a long overdue blog post from London’s 44con Cyber Security conference back in September. A lot of old memories were brought to the front as it were; the one I’m going to cover in this blog post is: file carving.

So what is file carving? despite the terminology it’s not going to be a full roast dinner; unless you have an appetite for data which as you’re here I’m assuming you have.

The TL;DR of “what is file carving” is taking a target blob of data (often a multi GB / TB file) and reducing it in to targeted pieces of data, this could be for instance grabbing all the jpeg images in a packet capture / mysqldump; or pulling that single table/schema out of a huge mysqldump with –all-databases (if you’re not using mydumper you really …

The London MySQL Meetup Group hosted a new evening of MySQL related talks on December 11, this time in Canonical’s offices in the Blue Fin Building. Conveniently, it was timed so that it coincided with the Debian/Ubuntu packaging sprint, which I also attended.

We started with pizza, beer and small talk. Since this was my first meetup in London, there were lots of new and interesting people to meet and talk to.

The topic of the evening was “MySQL distributions: in the cloud and on bare metal”, but before we got that far, James Page and Robie Basak presented the results so far of our ongoing …

Dear Customer,

We at Monitis want to thank you for being with us this past year and tell you what a pleasure it has been to help you reach your everyday business goals. Monitis is growing fast and we sincerely appreciate the trust you put in us to help you manage all of your IT challenges.

During the past year we have worked diligently to expand and improve our suite of services to match your needs. We were especially excited to bring you new offerings such as;

• Powerful integrations with industry leading partners such as; WHMCS, Zapier, PagerDuty and VictorOps
• Enriching our Application monitoring and added; Log Monitor, Email Round Trip, MySQL and Node.js monitors
• Real User Monitoring to a clear and quick view into the experience of your …

VividCortex now supports partial network capture to reduce load while monitoring MySQL database servers, where a tradeoff between full visibility and monitoring overhead might be desirable. This reduces our already-low overhead and enables higher accuracy in certain circumstances. Here’s a before-and-after image:

To review, one of ways we measure production MySQL query behavior at VividCortex is with libpcap, which sniffs network packets passively. Sometimes people think we’re “polling” or “sampling” to capture only a fraction of server activity, but in fact by default we see and analyze everything in full, packet-by-packet detail. And therein lies the problem.

The Problem

Our default network capture technique means we measure literally everything your server communicates with apps that query it. Every query, every error, everything.

We’ve worked extensively to optimize this process, reducing …

In this post I will try to explain the new MySQL binlog_error_action server option. This new option is available from MySQL 5.6.22 and later.

Background:
——————–
As part of MySQL replication all data changes that happen on the master server are recorded into a binary log so that they can be sent to slave and replayed there. If an error occurs that prevents mysqld from writing to the binary log (disk full, readonly file system, etc.) then the logs are simply disabled and operations continue on the master. This error mainly occurs during rotation of the binary log or while opening a binary log file.

This problem creates a serious potential for data loss …

Background on Backup Locks

I was very excited to see Backup locks support in release notes for the latest Percona XtraDB Cluster 5.6.21 release. For those who are not aware, backup locks offer an alternative to FLUSH TABLES WITH READ LOCK (FTWRL) in Xtrabackup. While Xtrabackup can hot-copy Innodb, everything else in MySQL must be locked (usually briefly) to get a consistent snapshot that lines up with Innodb. This includes all other storage engines, but also things like table schemas (even on Innodb) and async replication binary logs. You can skip this lock, but it isn’t …

Hello,

We at Monitis want to thank you for being with us this past year and tell you what a pleasure it has been to help you reach your everyday business goals. Monitis is growing fast and we sincerely appreciate the trust you put in us to help you manage all your IT challenges.

During the past year we have worked diligently to expand and improve our suite of services to match your needs. We were especially excited to bring you new offerings such as;

 
– Powerful integrations with industry leading partners such as; WHMCS, Zapier, PagerDuty and VictorOps

– Enriching our Application monitoring and added; Log Monitor, Email Round Trip, MySQL and Node.js monitors

– Real …

If you are automating your infrastructure deployments with Chef, then read on. We are glad to announce the availability of a Chef cookbook for ClusterControl. This cookbook replaces previous cookbooks we released for ClusterControl and Galera Cluster. For those using Puppet, please have a look at our Puppet module for ClusterControl.

ClusterControl Cookbook on Chef Supermarket

The ClusterControl cookbook is available on Chef Supermarket, and getting the cookbook is as easy as:

$ knife cookbook site download clustercontrol

This cookbook supports the installation of ClusterControl on top of existing database clusters:

• Galera Cluster
  • MySQL Galera Cluster by Codership
  …

This time of the year it is traditional, at least in the UK, to look back and reflect on the year that is coming to a close. Since we have just produced the release candidate for MaxScale and are looking forward to the GA release early in the New Year, it seems like a good time to reflect on the events that have bought us to this stage in the story of MaxScale.Going PublicThe start of 2014 also marked the start for MaxScale, with the first public announcements regarding MaxScale and the first downloadable binaries. MaxScale itself had been started internally before that, but we wanted to hold off on letting it out into "the wild" until there was enough of the functionality provided in order to be able to do more than just give "what it might be" type promises. At first we only had tar files available and only for …

This Log Buffer edition hits the ball out of park by smashing yet another record of surfacing with a unique collection of blog posts from various database technologies. Enjoy!!!

Oracle:

EM12c and the Optimizer Statistics Console.

SUCCESS and FAILURE Columns in DBA_STMT_AUDIT_OPTS.

OBIEE and ODI on Hadoop : Next-Generation Initiatives To Improve Hive Performance.

Oracle 12.1.0.2 Bundle Patching.

Performance Issues …