So your not a MySQL DBA, but you have to perform like one. If you have a production environment that’s running now, what are the first things you do when it’s not running or reported as not running?

1. Are the MySQL processes running? (i.e. mysqld and mysqld_safe)
2. Can you connect locally via cli?
3. What’s in the MySQL error log?
4. What are current MySQL threads doing? Locked? long running? how many? idle sources?
5. Can you connect remotely via cli?
6. Verify free diskspace?
7. Verify system physical resources?
8. If this is a slave, is MySQL replication running? Is it up to date?
9. What is the current MySQL load, e.g. reads/writes/throughput/network/disk etc?
10. What is the current InnoDB state and load? (based on if your using InnoDB)

After you do this manually more then once you should be scripting these commands to …

Dear Kettle fans,

PDI-200 has been out there for a while now.  Jens created the feature request a little over 3 years ago.  I guess the main thing blocking this issue was not as much a technical problem but more of a licensing and dependency one (Oracle JDBC dependency and distribution license).

However, now that we have the User Defined Java Class step we can work around those pesky problems. That is because the Java code in there only gets compiled and executed at runtime so it’s perfectly fine to create any sort of dependency in there you like.

The following transformation reads a set of rows from a stored procedure as described on this web page.

In short, our UDJC step executes the following code:

begin ? := sp_get_stocks(?); …

Starting with the great work of Yoshinori-san Using MySQL as a NoSQL – A story for exceeding 750,000 qps on a commodity server and Golan Zakai who posted Installing Dena’s HandlerSocket NoSQL plugin for MySQL on Centos I configured and tested HandlerSocket under Ubuntu 10.04 64bit.

NOTE: This machine already compiles MySQL and Drizzle. You should refer to appropriate source compile instructions for necessary dependencies.

# Get Software
cd /some/path
export DIR=`pwd`
wget http://download.github.com/ahiguti-HandlerSocket-Plugin-for-MySQL-1.0.6-10-gd032ec0.tar.gz
wget http://mysql.mirror.iweb.ca/Downloads/MySQL-5.1/mysql-5.1.52.tar.gz
wget …

There are three simple practices that can improve general INSERT throughput. Each requires consideration on how the data is collected and what is acceptable data loss in a disaster.

General inserting of rows can be performed as single INSERT’s for example.

INSERT INTO table (col1, col2, col3) VALUES (?, ?, ?);
INSERT INTO table (col1, col2, col3) VALUES (?, ?, ?);
INSERT INTO table (col1, col2, col3) VALUES (?, ?, ?);

While this works, there are two scalability limitations. First is the network overhead of the back and forth of each SQL statement, the second is the synchronous nature, that is your code can not continue until your INSERT is successfully completed.

The first improvement is to use MySQL’s multi values capability with INSERT. That is you can insert multiple rows with a single INSERT statement. For example:

INSERT INTO table (col1, col2, col3) VALUES (?, ?, ?),  (?, ?, ?), (?, ?, ?);

2010 has been the first year I have re-presented any of my developed MySQL presentations. Historically I have always created new presentations, however Paul Vallee gave me some valuable advice at UC 2010. In the past two weeks I’ve traveled to seven countries in South America on the OTN LA tour where I have been speaking about and promoting MySQL.

My three current presentations have been improved and even simplified, more future improvements are planned. There is definitely a benefit in repeating a good presentation multiple times.

My SQL Idiosyncrasies That Bite OTN View more …

It's that time of the year again — the nice folks at FOSDEM have granted us a developer room at their upcoming conference (February 5+6 2011 in Brussels, Belgium)!

As usual there were more applications than they were able to accommodate, so we are very grateful for this opportunity for collaboration. Titled "MySQL and Friends", our room next year will be H.2213 with a capacity of 100 seats. It will be at our disposal on Saturday 5th, from 13:00 till 19:00. Like last year, we would like to set up a schedule of talks related to the MySQL server and the various projects that surround it. Each talk will last 20 minutes, plus 5 minutes of Q&A and a 5 minute break for switching speakers, giving us 12 slots in total to fill with …

When we published our 2008 report on the impact of open source on the database market the overall conclusion was that adoption had been widespread but shallow.

Since then we’ve seen increased adoption of open source software, as well as the acquisition of MySQL by Oracle. Perhaps the most significant shift in the market since early 2008 has been the explosion in the number of open source database and data management projects, including the various NoSQL data stores, and of course Hadoop and its associated projects.

On Tuesday, November 9, 2010 at 11:00 am EST I’ll be joining Robin Schumacher, Director of Product Strategy from EnterpriseDB to present a …

If you have used MySQL for some time you know that mysqld can write binlogs. This is usually used for backup purposes and JITR or for replication purposes so a slave can collect the changes made on the master and apply them locally.

Most of the time apart from configuring how long you keep these binlogs they are pretty much ignored.

Recently I came across an issue.  I have a slave server which is NOT configured read only and which has an additional database used to collect statistics from the replicated database and provided aggregation and business information. The typical sales per country, per product, per day, week, month, year, per whatever etc.  This is the usual datawarehouse type functionality.  It’s done on a slave and not the master so that the load is not passed on down stream to all boxes. …

Next time you have an error whilst running an sql script into mysql using the pretty easy redirect into eg: mysql -uroot -pmsandbox -h127.0.0.1 -P3306 dbname < filename you might want to give the -v option a shot.

MySQL normally outputs an error with the line number like:

[mysql@dcassar-ubuntu /mysql/dumps/stored_procs 11:10:12]$ mysql -uroot -pmsandbox -h127.0.0.1 -P5151 test < file
ERROR 1267 (HY000) at line 375: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (latin1_general_cs,IMPLICIT) for operation '='


But 375 is not including comments and stuff so it’s a bit hard to go through the file to locate the exact section which is failing.

Run the same command with -v:

[mysql@dcassar-ubuntu /mysql/dumps/stored_procs 11:10:30]$ mysql -uroot -pmsandbox -h127.0.0.1 -P5151 -v test < file | tail -5
ERROR 1267 (HY000) at line 375: Illegal mix …

This is only a piece of trivia, however has anybody noticed that the MySQL logo has changed. Using the Legal Trademark page we can see the old logo and the new logo together.