PlanetMysql.ru - информация о СУБД MySQL » ndb

MySQL Cluster by Ralf Gebhardt

Colin Charles — Sun, 05 Feb 2012 11:25:32 +0000

Ralf Gebhardt of SkySQL.

Cluster: shared nothing architecture (no single point of failure), synchronous replication between nodes, ACID transactions, row level locking. In-memory storage (some data can be stored on disk, but indexes must be in-memory). Checkpointing to disk for durability. It supports two types of indexes – ordered T-trees, unique hash indexes. Online operations like adding node groups, software upgrades, table alterations. Quick standard architecture diagram displayed about MySQL Cluster.

Network partitioning protocol is designed to avoid a split brain scenario. Is there at least one node from each node group? If not then this part cannot continue – graceful shutdown. Are all nodes present from any node group? If so, then this is the only viable cluster – continue to operate. Ask the arbitrator – the arbitrator which parts will continue if no arbitrator is available the cluster shuts down.

Durability – in order for a node to recover fast some data is stored locally. The REDO log is synchronized by global checkpoints (GCP). The DataMemory is synchronized by local checkpoints (LCP).

I agree with Ralf — almost impossible to talk about NDB in 25 minutes. Its very deep, you’d need at least three hours to grasp it well.

PlanetMySQL Voting: Vote UP / Vote DOWN

Review of High Availability MySQL Cookbook by Packt Publishing

Dathan Pattishall — Mon, 07 Jun 2010 19:07:00 +0000

A few months ago, I reviewed MySQL Admin Cookbook. Today I am reviewing High Availability MySQL Cookbook from Packt Publishing by Alex Davies. Overall, I found the book to contain some good hidden Gems.

The book is a mixture of MySQL Cluster (NDB), Replication schemes, some performance tuning, some minor kernel tweaking, and some more exotic approaches to common High Availability problems. Overall, I found this book very informative and a good read.
Now the specifics, the book starts out on NDB and stays focused on this fact for about 60% of the book. The next 20% is on mySQL replication then about 10% of the book is on tweaking kernel, mysql, network settings to get the most out of the system. The last 10% is a mixture of uses of exotic systems such as GFS, Conga, ISCSI and how to use these shared storage techs with mySQL.

High Availability MySQL Cookbook, is a good read, and jogged my memory on NDB (since I do not use it on a day-to-day basis). If you are looking for a good reference on how to get an HA system up then this is a good book for you. If you are looking for why to use NDB over mySQL multi-master replication, this is not a book for you. The “why-to-use-this-over-that” is not the scope of the book. The drawbacks and concerns of what technology to use are not a focus of this book, and should not be. It is assumed that the reader knows which direction to go into for the most part or gives the reader enough information to set up and environment to see which way to go.

In conclusion, I like this book. I think it is rather concise, and right to the point, which either gets you started into building HA systems or gives you a good reference for an existing HA environment.

PlanetMySQL Voting: Vote UP / Vote DOWN

AlsoSQL

Stewart Smith — Thu, 08 Apr 2010 04:39:32 +0000

So there’s a bit of a swelling around the idea of NoSQL. That is, databases that don’t have an SQL interface in front of them – with the promise of better performance. With a well designed backend, this is no doubt the case.

A flexible query language is rather useful though. I think we’ll see the rise of AlsoSQL. That is systems that present a fast and simple protocol along with a SQL interface.

This hybrid system has seen use for many years. MySQL Cluster is one such example. SQL through MySQL Server, NoSQL through NDB API.

With Drizzle, I feel we’ll be in a pretty good position to offer non-sql based protocols and access methods to existing storage engines.

PlanetMySQL Voting: Vote UP / Vote DOWN

Continuing the journey

Stewart Smith — Thu, 11 Mar 2010 07:42:46 +0000

A couple of months ago (December 1st for those playing along at home) it marked five years to the day that I started at MySQL AB (~~now Sun~~, now Oracle). A good part of me is really surprised it was for that long and other parts surprised it wasn’t longer. Through MySQL and Sun, I met some pretty amazing people, worked with some really smart ones and formed really solid and awesome friendships. Of course, not everything was perfect (sometimes not even close), but we did have some fun.

Up until November 2008 (that’s 3 years and 11 months for those playing at home) I worked on MySQL Cluster. Still love the product and love how much better we’re making Drizzle so it’ll be the best SQL interface to NDB :)

The ideas behind Drizzle had been talked about for a while… and with my experience with internals of the MySQL server, I thought that some change and dramatic improvement was sorely needed.

Then, in 2008, Brian created a tree. I was soon sending in patches at nights, we announced to the whole world at OSCON and it captured a lot of attention.

Since November 2008 I’ve been working on Drizzle full time. It was absolutely awesome that I had the opportunity to spend all my days hacking on Drizzle – both directly with fantastic people and for fantastic people.

But… the Sun set… which was exciting and sad at the same time.

Never to fear! There were plenty of places wanting Drizzle hackers (and MySQL hackers). For me, it came down to this: “real artists ship”. While there were other places where I would no doubt be happy and work on something really cool, the only way I could end up working out where I should really be was: what is the best way to have Drizzle make a stable release that we’d see be suitable for deployment? So, Where Am I Now?

Rackspace.

Where I’ll again be spending all my time hacking Drizzle.

PlanetMySQL Voting: Vote UP / Vote DOWN

NDB$INFO with SQL hits beta

Stewart Smith — Wed, 03 Feb 2010 01:37:20 +0000

Bernhard blogged over at http://ocklin.blogspot.com/2010/02/mysql-cluster-711-is-there.html that MySQL Cluster 7.1.1 Beta has been released. The big feature (from my point of view) is the SQL interface on top of NDB$INFO. This means there is now full infrastructure from the NDB data nodes right out to SQL in the MySQL Server for adding monitoring to any bit of the internals of the data nodes.

PlanetMySQL Voting: Vote UP / Vote DOWN

NDB$INFO with SQL hits beta

Stewart Smith — Wed, 03 Feb 2010 01:37:20 +0000

PlanetMySQL Voting: Vote UP / Vote DOWN

New Open Query training days in Australia

Open Query — Fri, 02 Oct 2009 06:36:46 +0000

The favourite Open Query course modules as well as reworked and brand new ones, with November/December 2009 dates for Brisbane, Sydney, Canberra and Melbourne listed below. You can register for days/modules individually, to suit your time, budget and current needs. Your trainers are Sean, Ray and Arjen (see OQ people).

For the Canberra and Melbourne days which are DBA/HA, registrations for all of the modules in a series before 15 October will receive a copy of the “High Performance MySQL” book (normal bookstore price is AUD 105).

Canberra

Thu 5 Nov: MySQL High Availability – Strategy and Tools
Fri 6 Nov: MySQL Cluster Workshop

Sydney

Mon 9 Nov: MySQL Optimisation by Design
Tue 10 Nov: MySQL Locking, Transactions & Storage Engine Optimisation

Brisbane

Thu 19 Nov: MySQL Query Performance Optimisation and Tuning
Fri 20 Nov: MySQL Server Performance Optimisation and Tuning

Melbourne

Wed 9 Dec: MySQL Installation, Security and User Management
Thu 10 Dec – Fri 11 Dec MySQL Backup and Recovery + Replication Workshop

PlanetMySQL Voting: Vote UP / Vote DOWN