Mia Saini did a video interview and article on Forbes called Drop-Out Entrepreneur.

Accountant, Accountng solution, Accunting Consulting…

Most companies don’t do their accounting by hand. For routine accounting, most companies use accounting software such as QuickBooks, Peachtree or more specialized programs for specific industries. Do some research to see if your industry has a dedicate…

Oracle managed to score a major victory last week at the MySQL Conference by announcing performance gains of 200-360% in the forthcoming version 5.5.  This is a tremendous improvement and comes in part due to closer collaboration between what were historically two distinct (and occasionally competitive) groups: the InnoBase team and the MySQL Server team.  Bringing the InnoBase team under the direction of the MySQL Server team under Tomas Ullin is a great benefit not only to MySQL developers, but also for MySQL users.  No doubt these performance gains are a result of many months of hard work by not only Tomas, but also a good number of folks on both teams including guys like Mikael Ronstrum, Kojstja, Calvin Sun and others.  

Reaction to the new release has been positive in the community from the likes of …

Ok. So it all begins with somebody who is using INSERT ON DUPLICATE KEY UPDATE. That guy wants to count the number of UPDATE actions that statement has taken, as opposed to INSERT actions.

We could have been using mysql_info() to fetch that information. But instead we rig the UPDATE clause: CODE:root@localhost [kris]> create table t ( 
  id integer unsigned not null primary key, 
  d integer unsigned not null 
) engine = innodb;
Query OK, 0 rows affected (0.16 sec)

root@localhost [kris]> insert into t values ( 1, 1), (2,2), (3,3);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0
…

In continuation with yesterdays post, you can create a CRON JOB to run at intervals to monitor the disk space on the database servers. I have created a stored procedure which will be called by the CRON job at certain intervals. Not necessarily you would want to check the database size activity every hour, you can customize it accordingly.

Here are the steps you can follow,

Firstly you need to create a SP to calculate the database size of all the schemas, I have attached the SP for your reference.

usp_allschemas.sql

You can copy the same from below,

DELIMITER $$

DROP PROCEDURE IF EXISTS `mysql`.`usp_allschemas` $$

CREATE PROCEDURE `mysql`.`usp_allschemas` ()

BEGIN

SELECT NOW(), VERSION();

SELECT table_schema,

…

Hi

Unusually, we actually wrote a text for Monty's keynote speech this year. I'm publishing it below. Part of the speaker notes are just bullet points though, but the text may still be interesting to publish. Also, there is a funny joke about Oracle being a major MariaDB contributor that Monty somehow missed in the speech.

The keynote is also available on Youtube. In fact, Sheeri has been nice enough to collect all videos from the conference into a playlist.

read more

Much has been made of certain limitations of MySQL’s query optimizer (“planner”). Subqueries, lack of sort-merge joins, and so on. This is not MySQL-bashing and no one should be offended. Some people have worked to make things better, and that code is in branches that were intended for future releases. But if that work were available right now, would you trust it?

This question is important because the optimizer is complex and full of compromises and black magic. Even minor changes occasionally have weird edge cases that cause a regression in some workload. Are major changes trustworthy?

I’ll give a specific example. In version 5.0, MySQL gained the ability to use more than one index for a query. This is called index_merge in EXPLAIN, and sometimes people think it’s the best thing ever. In practice, I can say two general things about queries that use an index_merge plan:

1. If the optimizer chooses an …

(and before you ask, yes “rotating blades” comes from “become a fan”)

I’m forming the ideas here first and then we can go and implement it. Feedback is much appreciated.

Two tables.

Table one looks like this:

CREATE TABLE fan_of (
user_id BIGINT,
item_id BIGINT,
PRIMARY KEY (user_id, item_id),
INDEX (item_id)
);

That is, two columns, both 64bit integers. The primary key covers both columns (a user cannot be a fan of something more than once) and can be used to look up all things the user is a fan of. There is also an index over item_id so that you can find out which users are a fan of an item.

The second table looks like this:

CREATE TABLE fan_count (
item_id BIGINT PRIMARY KEY,
fans BIGINT
);

Both tables start empty.

You will have 1000, 2000,4000 and 8000 concurrent clients attempting to run the …

The video of my 5-minute Ignite talk on XtraDB is up on YouTube. Ignite talks have exactly 20 slides on auto-advance every 15 seconds. “Enlighten us, and make it fast!” It’s better than a lightning talk. I explained the difference between Percona XtraDB and other technologies such as standard MySQL, OurDelta, and MariaDB.

Related posts:

1. Xtrabackup is for InnoDB tables too, not just XtraDB Just thoug
2. Recap of CPOSC 2009, plus slides Yesterday
3. Learn about mk-query-digest …

I created the Bluegecko MySQL training AMI as a MySQL sandbox that folks could use to learn things about MySQL. I wanted the AMI to have MySQL 5.0, and a large collection of tools — for both tinkering and visualizing what is happening inside MySQL and on the system in general.

I chose to host the AMI on a small instance since they’re cheap to operate, which means you can fire up 3-4 of them to try out a replication scheme without feeling guilty. It runs CentOS 5.4 and MySQL 5.0.77 from the CentOS repository.

One of the goals I had for the training AMI was for it to be easy to visually inspect what is going on inside of MySQL and the system at large. To that end I’ve installed Cacti, a graphing and visualization tool, and equipped it with templates that allow you to visualize …