I guess I brought the snow with me to New York as I awoke to a nice 10cm dump. Anyway today would best be described as a day of ‘Disruptive Tech’

I first attended Kevin Kempters intro into PorstgreSQL High Availability. A very well balanced presentation that gave a very good overview of what is available out of the box for both Warm Standbys and Hot Standbys how they can be very easily implemented. He also gave a quick overview of other tools that can be used including Slony for detailed fail-overs and PgPool for load balancing and relication. Not very disruptive but it does show that Pg is on par with most of the heavy hitters such as MySQL and Oracle.

The keynote this year was by Ed Boyajian the CEO or EnerpriseDB and he gave an big picture of the DB in terms of market which is a whopping 26$ Billion a year in the US alone of which the the two five players have 90% of the market one having more than half.

He made …

This is a follow up to my previous post titled “MySQL analytics: information_schema polling for table engine percentages”. Here’s an updated query with more output and quicker execution time. What you get: innodb table space utilization percentage, data+index usage total and per innodb/myisam engine, innodb data/index/percentage, myisam data/index/percentages, and overall percentage values. Rather useful for profiling your table engine usage.

Sample output:
innodb_tablespace_utilization_perc: 100
total_size_gb: 26.275011910126
index_size_gb: 2.994891166687
data_size_gb: 23.280120743439
innodb_total_size_gb: 6.751220703125
innodb_data_size_gb: 5.2576751708984
innodb_index_size_gb: 1.4935455322266
myisam_total_size_gb: 19.523791207001
myisam_data_size_gb: 18.02244557254
myisam_index_size_gb: 1.5013456344604
perc_index: 11.3982
perc_data: 88.6018
…

This is just a friendly reminder that you can nominate your favorite MySQL community member, application and company for the traditional awards. The nominations must be in by the end of this week, after which the panel votes on them:

http://openlife.cc/blogs/2011/march/call-nominations-2011-oreilly-mysql-...

I've seen at least a few people on IRC that were thinking of sending in nominations, now is a good time to do it!

The address is mysql.awards@gmail.com

Multi-master replication is the key to applications ranging from credit card processing to online testing. Up until now things haven't exactly been easy for MySQL users, though. MySQL native replication cannot move data from multiple masters into a single slave (a.k.a. multi-source replication). MySQL also has poor support for masters in multiple locations. With Tungsten you can now look

STOP PRESS: the recording of this forum is now available for replay.

On March 16th, we’re holding an on-line forum to discuss MySQL on Windows – I’ll be handling the High Availability session (includes MySQL replication and MySQL Cluster). The event runs from 9 am Pacific Time until 12:00 pm; the HA session is schedules for 11:00 Pacific and runs for half an hour. I’ll also be answering questions on-line during the forum. As always the even is free but you need to …

Have you been thinking about taking MySQL DBA training, but just don't have the the time? Now there's a quick fix for you! SkySQL Ab's expert MySQL database instructors - including one of the authors of the original MySQL AB Training Program - will be offering a one day (6 hour) tutorial at 9:00AM, on Monday, 11 April, 2011, at the O'Reilly MySQL User Conference & Expo in Santa Clara, CA. During this jam-packed tutorial specifically designed for attendees of the User Conference, we'll present some of the most popular topics from SkySQL's 5-day training class, "Administering MySQL", including:
* Storage Engine Architecture - features, choosing which to use etc.* Backup - strategies, methods, pros and cons, etc.* Server …

Netflix went down over three hours ago, and everyone is on edge here. My son just started reciting the script to "Monty Python and the Holy Grail" in an attempt to keep our courage up. This may be the last thing I ever write, so — Oh, never mind, it's back up again ... Crisis averted, and on to this week's developer news.

We have an App Store Appstore for that!

Amazon this week unleashed their own Appstore for Android devices. Apple took umbrage at the use of the (evidently trademarked) term "App Store" and fired a salvo of …

For backups, historically in the MySQL world you’ve had mysqldump (a SQL dump, means on restore you have to rebuild indexes), InnoDB Hot Backup (proprietary, but takes a copy of the InnoDB data files, so restore is much quicker), LVM snapshots (various scripts exist, does have larger IO impact, requires LVM) and more recently xtrabackup. Xtrabackup essentially does the same thing as InnoDB hot backup except that it’s free and open source software.

Many people have been using xtrabackup successfully for quite a while now.

In Drizzle7, our default storage engine is InnoDB. There have been a few changes, but it is totally InnoDB. This leaves us with the question of backup solutions. We have drizzledump (the Drizzle equivalent to MySQL dump – although with fewer gotchas), you could always use LVM snapshots and the probability of Oracle releasing InnoDB Hot Backup for Drizzle is rather minimal.

So enter xtrabackup as a …

This was a request yesterday on a mailing list about how to I block DROP statements from running on a slave. There were responses including MySQL could not do this, or try other replication technologies however I thought I would share how you can easily do this on a slave.

You simply deny access on the slave. It is as simple as changing the MySQL privileges for the user(s) in question to remove DROP or ALTER capabilities.

Of course this will break replication rather then simply ignore the statement however I suspect that is the intended goal anyway. The first statement that uses the table will fail regardless. With appropriate monitoring of replication you should know in about 15 seconds. (Hint: If you don’t monitor replication or monitor it frequently, DO SO NOW!)

These leads to the question, what if the statements are legitimate? There are several solutions. Enable the specific privileges on the slave when the DBA …

The best part of the recent MariaDB meeting in Lisbon for me was that I got some good feedback on my group commit work. This has been waiting in the review queue for quite some time now.

One comment I got revolve around an optimisation in the implementation related to how threads are scheduled.

A crucial step in the group commit algorithm is when the transactions being committed have been written into the binary log, and we want to commit them in the storage engine(s) in the same order as they …