In this post I want to show three things:

1. How many single row SELECTs per second (on the PRIMARY KEY, no batching) you can do on on a Cluster with two data nodes
2. Show how MySQL Cluster scales with threads and mysql servers
3. How ndb_cluster_connection_pool affects performance

Next post will be what happens to INSERTs, and then UPDATEs.

Setup

• two data nodes
• one to four mysql servers
• interconnected with Gig-E (single NIC)
  

deployed on six computers (of varying quality, see below). www.severalnines.com/bencher was co-located with each mysql servers to drive the load. The reads were a PK SELECT like:

SELECT data1,data2 FROM t1 WHERE id=[random];

data1 and data2 are each 256B, so in total 512B was read. …

This miniconf aims to cover many of the current methods of data storage and retrieval and attempt to bring order to the universe. We’re aiming to cover what various systems do, what the latest developments are and what you should use for various applications.

We aim for talks from developers of and developers using the software in question.

Aiming for some combination of: PostgreSQL, Drizzle, MySQL, XFS, ext[34], Swift (open source cloud storage, part of OpenStack), memcached, TokyoCabinet, TDB/CTDB, CouchDB, MongoDB, Cassandra, HBase….. and more!

Call for Papers open NOW (Until 22nd October).

Umas das características mais interessantes que o MySQL adquiriu com o passar do tempo e também o que o diferencia dos outros produtos de bancos de dados é a capacidade de ser um plugable database. Esta é a característica que permite que o MySQL receba na segunda camada de sua arquitetura os plugins, sendo que [...]

Update: Also read A brief update on NUMA and MySQL.

The “swap insanity” problem, in brief

When running MySQL on a large system (e.g., 64GB RAM and dual quad core CPUs) with a large InnoDB buffer pool (e.g., 48GB), over time, Linux decides to swap out potentially large amounts of memory, despite appearing1 to be under no real memory pressure. Monitoring reveals that at no time is the system in actual need of more memory than it has available; and memory isn’t leaking, mysqld‘s RSS is normal and stable.

Normally a tiny bit of swap usage could be OK (we’re really concerned about activity—swaps in and out), but in many cases, “real” useful memory is being swapped: primarily parts of InnoDB’s buffer pool. When it’s needed …

Some people seem unclear about whether there will be a 2011 MySQL conference from O’Reilly. There most definitely will be, and the CfP is open. We are looking for speakers. I’m on the speaker selection committee again this year for the Nth time, and my advice from past years still stands. This year we’re also looking for a greater diversity of database products, including other relational databases, NoSQL databases, and ancillary technologies.

MySQL Sunday at Oracle's Open world was a huge success given that it was MySQL's first year at the conference. I had a lot of fun and even a little excitement when a shirt caught fire during my presentation.

Just added a video to the site for MySQL High Availability. Check it out here if you missed it at MySQL Sunday, also, you can get the slides in PDF format here.

You can also check out all the other presentations here, brought to you by PalominoDB.

-- UPDATE --
9-29-10

Recently I was contacted by a fellow community member at Oracle who had some great …

Numerous times now, I’ve seen people have troubles creating MySQL services on Windows manually (using ‘sc’), whether it be for mysqld itself, MySQL Proxy, or the MySQL Enterprise Monitor and/or Agent.

The proper syntax for ‘sc’ can get tricky when you have spaces in pathnames, which is very common in Windows, and the need for –defaults-file (which means two paths each potentially containing spaces).

So, if you have spaces in both your binpath and your path to –defaults-file, then the following syntax will work for you (all on a single line):

sc create MySQLEnterpriseMonitorAgent 
binpath= ""C:Program FilesMySQLEnterpriseAgentbinmysql-monitor-agent.exe" 
--defaults-file="C:Program FilesMySQLEnterpriseAgentetcmysql-monitor-agent.ini"" 
DisplayName= "MySQL Enterprise Monitor Agent" start= "auto"

Note that you could easily use the exact same syntax to install a Windows service for the MySQL server itself …

While not as well known as the Google or Facebook patches the TiVo mysql patch includes some changes that make monitoring and query optimization a bit easier than mainline MySQL. The modified tarball, available at http://www.tivo.com/mysql/ contains a modified mysqld_safe, mysqldump, and improvements to the row statistics show commands that came from google.

mysqld_safe modifications

–fallback-ledir
The –ledir option tells mysqld_safe which directory contains the mysqld file that it should use. TiVo has added the –fallback-ledir option which will switch the ledir should mysqld crash. This makes it possible to run a new mysqld binary then fallback to the stock one should the new one crash. This feature has never been called to duty in production but it makes me sleep better.

–crash-script
This is a new option to mysqld_safe which will execute a script …

VIEWING THE DATA

You’ve seen in the last few postings how to find, import and use GIS data with MySQL. But, the ‘G’ in geographical includes GRAPHIC and a little eye candy never hearts your understanding of the curves.

Everyone knows of  map.google.com.  Mark McClure has a great site explaining the use of Google’s APIs.  He explains how to generate interactive maps with labels for places and routes indicating driving directions. Many of Mark’s example explain exactly the sorts of things I’ve wanted to do with maps for years.  Like Cycling routes on Google Maps.

Using the GPS in my iPhone as a …

Installing Lighttpd With PHP5 And MySQL Support On OpenSUSE 11.3

Lighttpd is a secure, fast, standards-compliant web server designed for speed-critical environments. This tutorial shows how you can install Lighttpd on an OpenSUSE 11.3 server with PHP5 support (through FastCGI) and MySQL support.