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Displaying posts with tag: Databases (reset)
May
17
2010
MySQL Monitoring – What’s really needed
Posted by Ronald Bradford on Mon 17 May 2010 22:25 UTC
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The implementation of MySQL Monitoring is critical for any organization that uses a database and wants to avoid the inevitable disaster. There are 3 important components that all serve a key purpose to “MySQL Monitoring” in general:

  • Monitoring – Historical and graphical information
  • Alerting – Tell me when something is wrong
  • Dashboard – The State of NOW

Monitoring

There is no one option for Monitoring that is significantly better then another. A short list of what’s on offer can be found at http://monitoring-mysql.com/monitoring-products. What’s important is you have monitoring in place so historically you can review situations and compare across your servers and enabling the better identification of physical or database bottlenecks. My recommendations for products are …

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May
17
2010
Finalized speakers list for Kaleidoscope conference
Posted by Ronald Bradford on Mon 17 May 2010 20:44 UTC
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We have secured approval for our final two speakers and now have a full schedule for the 4 day MySQL track at ODTUG Kaleidoscope conference. The conference is in Washington DC from Monday June 28th to Thursday July 1st. Welcome to Josh Sled and Craig Sylvester that will be joining our existing list of speakers.

This conference will include 19 sessions of dedicated MySQL content from Monday thru Thursday by well qualified MySQL community members, as well a forums discussion and reception on Monday night. You don’t need to be an Oracle developer to get the benefit of this conference. We will offering a discount code for MySQL attendees in the upcoming days.

If you are in the DC area, the Monday night forum (known as the sundown sessions) as well as the reception are FREE for the MySQL community. This was a great jesture of the Oracle …

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May
11
2010
Why is my database slow?
Posted by Ronald Bradford on Tue 11 May 2010 21:31 UTC
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Not part of my Don’t Assume series, but when a client states “Why is my database slow”", you need to determine if indeed the database is slow.

Some simple tools come to the rescue here, one is Firebug. If a web page takes 5 seconds to load, but the .htm file takes 400ms, and the 100+ assets being downloaded from one base url, then is the database actually slow? Tuning the database will only improve the 400ms portion of 5,000ms download.

There some very simple tips here. MySQL is my domain expertise and I will not profess to improving the entire stack however perception is everything to a user and you can often do a lot. Some simple points include:

  • Know about blocking assets in your <head> element, e.g. .js files.
  • Streamline .js, .css and images to what’s needed. .e.g. download a 100k image only to resize to a thumbnail via style …
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May
10
2010
More on understanding sort_buffer_size
Posted by Ronald Bradford on Mon 10 May 2010 21:48 UTC
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There have been a few posts by Sheeri and Baron today on the MySQL sort_buffer_size variable. I wanted to add some more information about this buffer, what is impacted when it is changed, and what to do about it?

The first thing you need to know is the sort_buffer_size is a per session buffer. That is this memory is assigned per connection/thread. I’ve seen clients that set this assuming it’s a global buffer Don’t Assume – Per Session Buffers.

Second, internally in the OS usage independently of MySQL, there is a threshold > 256K. From Monty Taylor “if buffer is set to over 256K, it uses mmap() instead of malloc() for memory allocation. Actually – this is a libc malloc thing and is tunable, but …

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May
07
2010
Free MySQL Event in Washington DC
Posted by Ronald Bradford on Fri 07 May 2010 20:21 UTC
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As the program chair for the recently announced MySQL Track at the ODTUG Kaleidoscope conference located in Washington DC we are also looking into an associated free community event for MySQL locals in addition to a dedicated track for 4 days.

Please let us know your name and email via the form at http://ronaldbradford.com/ODTUG/free-event/ so we can provide more details in the coming week as we try to finalize logistics.

Registration will be necessary for attendance however for now we just want to know who is local so we can provide more details soon!

Updated. Full details of the free Monday night sundown sessions and reception can be found at MySQL track with free event at …

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May
03
2010
The MySQL community impacting the Oracle community
Posted by Ronald Bradford on Mon 03 May 2010 19:28 UTC
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I’m happy to announce that the MySQL community has been given the opportunity to speak at the upcoming Oracle Developer Tools User Group (ODTUG) Kaleidoscope conference in Washington DC. We will be releasing more details this week of the MySQL presentations and topics and we are finalizing details of possible options to include the local MySQL community during the event.

The various independent Oracle User Groups in North America that embody “by the community and for the community” have been very positive with including the MySQL community. With the Sun/MySQL now Oracle community team of Giuseppe Maxia, Lenz Grimmer, Kaj Arnö and Oracle ACE Directors Sheeri K Cabral and myself we have been happy with the openness and willingness to include us in the larger Oracle ecosystem.

We’ll announce the schedule when we finalize it, but we have had a great response from …

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Apr
30
2010
The MySQL documentation is not always right
Posted by Ronald Bradford on Fri 30 Apr 2010 15:24 UTC
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Let me premise this post with the statement I think the MySQL documentation is an excellent and highly accurate resource. I think the MySQL docs team do a great job, however like software and people, documentation is not perfect.

As members of the MySQL community you can always contribute to improve the process by reading the documentation and logging any issues as Documentation Bugs.

Some time ago in a discussion with a friend and colleague, we were talking about changes in historical defaults that had been improved finally in MySQL 5.4 The specific discussion was on the new default innodb_buffer_pool_size and we both agreed it increased significantly. One said 1GB, the other said 128MB. Who was right? Well we both were, and we were both inaccurate depending on versions.

Referencing the 5.4 Manual in …

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Apr
29
2010
The Drizzle Census
Posted by Ronald Bradford on Thu 29 Apr 2010 03:01 UTC
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One thing I have often wondered is just how many MySQL instances exist in the world and what MySQL versions and architectures are in use. We hear of 50,000 windows downloads per day but this is misleading because MySQL is basically bundled with Linux by default or installed from various repositories. Linux servers powers many websites.

In Drizzle we have a proposed plan, the Drizzle Census. From the productive Drizzle Developers Day recently at the 2010 MySQL conference we sat down and created a blueprint, and subsequent high level spec of what we considered this optional plugin should do. We didn’t get as far as I would have liked in a code …

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Apr
26
2010
Installation issues with MySQL 5.5.4 and resolveip
Posted by Ronald Bradford on Mon 26 Apr 2010 14:53 UTC
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I was installing the latest MySQL 5.5.4 on a new machine and I came across the following issues during installation, steps I generally perform on other versions without any incidents. 

$ sudo su -
$ cd /opt
$ wget http://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.4-m3-linux2.6-x86_64.tar.gz/from/http://mysql.mirrors.hoobly.com/
$ tar xvfz mysql-5.5.4-m3-linux2.6-x86_64.tar.gz
$ cd mysql-5.5.4-m3-linux2.6-x86_64
$ scripts/mysql_install_db
Neither host 'barney' nor 'localhost' could be looked up with /usr/bin/resolveip
Please configure the 'hostname' command to return a correct hostname.
If you want to solve this at a later stage, restart this script with the --force option

Perform some checks 

$ /usr/bin/resolveip
-su: /usr/bin/resolveip: No such file or directory

$ hostname
barney

$ head -2 /etc/hosts
127.0.0.1       localhost
127.0.1.1       barney

I was surprised to find that my Ubuntu 10.04 Lucid Lynx box had a …

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Apr
19
2010
2010 MySQL Conference Presentations
Posted by Ronald Bradford on Mon 19 Apr 2010 16:11 UTC
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I have uploaded my three presentations from the 2010 MySQL Users Conference in Santa Clara, California which was my 5th consecutive year appearing as a speaker.

A full history of my MySQL presentations can be found on the Presenting page.

…

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