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RMOUG MySql SIG

Dave Stokes — Fri, 18 May 2012 21:18:21 +0000

The Roucky Mountain Oracle Users Group’s MySQL Special Interest Group met today for four presentations.

Effective MySql’s Ronald Bradford explaining Explain

Ronald Brafdord explaining Explain[/caption] Ronald Bradford started the day on backup and recovery and then had a second session on optimizing queries. George Trujillo had a session on demystifying MySQL for Oracle DBAs and Developers. Lastly, I preseted on SQL and NoSQL. If you live in the greater Dener area, you shoudl make sure you take part in the next RMOUG meeting.

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Mozilla DB News, Friday May 18th

Sheeri K. Cabral — Fri, 18 May 2012 16:21:08 +0000

Last week I did not post one of these, because I was at Professional IT Community Conference (PICC) 2012; in New Brunswick, NJ. This is my third year in a row speaking and attending the conference, and it is always a great time. I did a session on MySQL Security (PDF slides) and another on Getting Started with a Podcast (PDF slides). There will be videos available sometime in the future, and I will link to those when they are up.

Other than that, it has been a fairly hectic two weeks. The final set of machines was moved out of the data center on Tuesday, so there was some work on that done, and there will be residual cleanup to do, but that is mostly behind us now. There was plenty of setting up machines, backing up machines and changing MySQL ACLs going on, with more to come to finally clean up all the cruft that has gone away.

And in bullet-point list format, everything else:

We finally got all the proper drivers/firmwares/system updates on the 2 addons databases that were crashing.

Unfortunately, now there are 2 other machines crashing (the first 2 were HP machines, these are seamicro machines).

Removed many staging databases that were not in use, such as the one for Chocolate Factory.

Creating new users on a database that had an application password leak.

Lots of documentation updating happening, and some new documents created, such as what VIPs folks need to use for certain databases, instead of connecting directly. This helps make automated failover and MySQL upgrades transparent.

Created a database and user ACLs for Tree Status

Created a database and ACLs for the Mozilla Ignite Apps Challenge

Created a database and ACLs for the Mozilla Popcorn website, which shows folks how to be powerful video editors.

Created a database and ACLs for the MozTrap website.

Data changes to Graphs

That's all, folks!

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OurSQL Episode 91: It’s Not Our Type, Part 1

Technocation — Fri, 18 May 2012 15:35:58 +0000

In this episode we talk about string data types, comparing them to the ISO:2003 SQL standard.

Gerry has joined Tokutek - Congrats Gerry! We interviewed Martin from Tokutek in episode 86.

Conferences:
MySQL Innovation Day Schedule Tuesday June 5th, Redwood Shores, CA. Register here (free). Content will be available via live stream, so save the date!

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How having many tables affects MySQL memory usage?

Przemek Malkowski — Fri, 18 May 2012 12:47:34 +0000

You could say: what could be the reason for having really big number of tables? Just design the application properly! It’s not always that easy. And this post isn’t really about arguing whether having many tables is good or not, it’s about what happens in terms of memory usage if you already reached that point.

Btw what do I mean by *many*? From my experience it’s tens of thousends or even millions rather than hundreds.

The inspiration for me to write this post was strong desire to try out the latest declared improvements in that area announced to be done in MySQL 5.6. _¹

What I did was a very simple test where I loaded sql dump of databases and tables definitions only into different versions of MySQL. During the load time I was monitoring memory usage of mysqld process (RSS value from ps aux) as a function of tables number. Additionaly I compared disk usage in case you choose single innodb table space versus file per table, also in relation to number of tables.

Settings I used for test were all default and I chose lowest possible innodb buffer pool:

innodb_buffer_pool_size = 8M

except when I started to test Percona versions I realized that the lowest allowed value there was 32MB, this warning appeared in error log after the service start:

“[Warning] option ‘innodb-buffer-pool-size’: signed value 8388608 adjusted to 33554432″

So both Percona versions I tested had 32MB and all others had 8MB but I think it wasn’t that important in this particular test.

Additionally for Percona versions I used the

innodb_dict_size_limit

variable introduced already in 2009 _².

The sample table set that I used has around 50 different tables with various number of fields and indexes.

Here are the results of creating more than a million tables:

I wonder what is the difference between the patch that Percona did few years ago (and which was available starting from 5.0.77-b13 of Percona Server) and latest fix available in MySQL 5.6.x branch. Any way It’s really nice to see it among all other great improvements that are happening in 5.6.x development line.

OK, now let’s see how the disk usage is affected in this simple test by just creating empty tables in two scenarios: single InnoDB ibdata file and when innodb_file_per_table option is set. In this case I observed no differences between various MySQL versions, so you can see only one here.

Database is in Transition. try the statement later: SQL Server

nav — Fri, 18 May 2012 10:53:00 +0000

Problem:

I was trying to take the database offline to perform some maintenance on one of our QA server.

We have got a strange error "Database is in Transition. try the statement later Error 952"

Even i was not able to run the sp_who and sp_who2 also as it was also giving the same error.

Resolution: What i have tried?

I closed the SSMS (SQL Server Management Studio) and restarted it again.

Then to confirm and check for any blocking query, i ran sp_who and sp_who2 and it ran successfully.

Then to make Database offline/online i have used the below command and it worked like a charm :)

USE master
GO

ALTER DATABASE

SET OFFLINE WITH ROLLBACK IMMEDIATE

...

ALTER DATABASE SET ONLINE

Its a strange error with SQL-2005 Management Studio or we can say a bug.

This small issue can cause a big headache for someone.. hope this will helpful. :)

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Upcoming conferences to learn more about MySQL Cluster & Replication

Andrew Morgan — Fri, 18 May 2012 09:35:41 +0000

There are a couple of conferences coming up where you can expect to learn about the latest developments in MySQL Cluster and MySQL Replication (as well as what else is happening in MySQL 5.6).

The first is the Oracle MySQL Innovation Day which is being held in Oracle HQ at Redwood Shores. This is an all-day event on 5th June – unfortunately I won’t be able to attend this one but there will be lots of great Cluster and replication sessions. If you can’t make it out to California then there will be a live Webcast. You can register here to attend in person or join the webcast.

The second is MySQL Connect – this runs the weekend before Oracle OpenWorld in San Francisco; it’s not until 29th September but it’s worth registering now to get the early bird pricing and save $500 (end 13th July). There are lots of great sessions lined up both from the MySQL experts within Oracle and users and community members.

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Log Buffer #272, A Carnival of the Vanities for DBAs

The Pythian Group — Fri, 18 May 2012 07:00:30 +0000

It is evident and beyond doubt now that the new media technologies like Twitter and Facebook are not going to wipe-out the blogs, rather they are complimenting each other very nicely and it seems they were made for each other. This Log Buffer Edition enhances this match, and presents you Log Buffer #272. Oracle: It [...]
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Log Buffer #272, A Carnival of the Vanities for DBAs

The Pythian Group — Fri, 18 May 2012 07:00:30 +0000

Connector/Net 6.4

MySQL — Fri, 18 May 2012 00:00:00 +0000

Connector/Net 6.4 (6.4.5 GA, published on Friday, 18 May 2012)
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Bug.mysql.com and Contributions!

Keith Larson — Thu, 17 May 2012 14:35:00 +0000

Oracle enhanced the bugs.mysql.com site to provide a better experience for users to submit contributions !

A new 'Contributions' tab has been added to the bugs.mysql.com user interface. This tab will allow users to have a defined space for their contributions. An Oracle Contributor Agreement (OCA) will still be required for all contributions. If needed, the OCA FAQ is posted here.

Please take advantage of this new feature when you help support and enhance MySQL !

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