Arjen’s personal blog on lentz.com.au

Just a note that my personal blog resides on lentz.com.au/blog/
The story is this… I first started my blog when at MySQL AB, the Community Relations gig. It was a mix of personal and MySQL-related stuff, and hosted at LiveJournal. Last year we managed to migrate all the LiveJournal data to the Open Query blog instance, [...]

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Ken Jacobs leaves Oracle

Matt Asay writes today in Oracle loses some MySQL mojo about Ken Jacobs leaving Oracle. For me, that’s a major bummer. Ken has been a long-time visitor of the MySQL Conference and that’s where I first met him: a friendly and knowledgeable person, on database technology in general but also about MySQL. When Innobase Oy [...]

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Petition for MySQL consideration in Oracle+Sun merger

MySQL requires special consideration in the Oracle+Sun merger, otherwise both Oracle and MySQL users and vendors will literally pay the price. If you agree, please sign this petition now.
To be very clear, Open Query is in favour of the merger, we feel that overall it’s a good fit. We would also like to see it happen [...]

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Possible movement in the Oracle/Sun/MySQL/EU case

From NY Post: Oracle Leader Blinks – Larry’s Olive Branch (to the EU), the NYpost sources apparently say that “what [...] Ellison is proposing is the creation of a firewall between MySQL and the rest of the combined company, and possibly setting up an entirely separate board for the MySQL business.”
There is no independent confirmation [...]

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On SQL vs No-SQL

The No-SQL tag really lumps together a lot of concepts that are in fact as distinct from eachother as they are from SQL/RDBMS.
An object store is not at all similar to Cassandra and Hypertable, which is not at all like an column store. And when looking at BigTable derivatives, it’s quite important to realise that [...]

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The search for MySQL 5.5

So, MySQL 6.0 was ditched, and a few weeks ago 5.4 was also – its features to be added in other (earlier) versions (I’m told 5.2 but not sure). I reckon that’s good news, regardless of the version number. There was also an announcement about a change in the release mechanism at Sun/MySQL.
Now for practicals. [...]

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thread_stack_size in my.cnf

Many configs have thread_stack_size configured explicitly, but that can cause rather bad trouble:

if the stack inside a thread it’s too small, you can get segfault crashes (stack overflow, essentially). Particularly on 64-bit.
if the stack is too large, your system cannot handle as many connections since it all eats RAM.

Let mysqld sort it out, on startup [...]

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Announcing Upstarta Camp – Brisbane Tue 24 Nov 2009

When: Tuesday 24 November (afternoon before first OSDC day), 12pm-5pm
Where: Brisbane, Mt Coot-Tha / Bardon area (near OSDC venue)
What is it? A picnic in the park. Yes, literally! It’s a workshop, but we’re doing a barbecue beforehand. The afternoon (including the barbecue) is $10 for members, $20 for non-members. We haven’t set a firm cap [...]

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GRAPH engine – Mk.II

The GRAPH engine allows you to deal with hierarchies and graphs in a purely relational way. So, we can find all children of an item, path from an item to a root node, shortest path between two items, and so on, each with a simple basic query structure using standard SQL grammar.
The engine is implemented [...]

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BarCamp Brisbane IV – Sat 17 Oct 2009


Arjen Lentz, Exec.Director @ Open Query (http://openquery.com)
Exceptional Services for MySQL at a fixed budget.
Follow our blog at http://openquery.com/blog/
OurDelta: enhanced builds for MySQL @ http://ourdelta.org
Just a reminder – BarCamp Brisbane is on again this Saturday, all day, at the East Brisbane Bowls Club. Its a chance for techies and tech entrepreneurs to get together and meet [...]

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