MySQL Day at SCaLE

Thanks to Lynn Ferrante, Keith Larson, Colin Charles and Max Mether for presenting. And thanks for those who attended the sessions. Sorry we didn’t have more seats and we will see what we can do for 2013!

SCaLE runs for two more days and there are a few more MySQL sessions scheduled. If you are in the area of LAX, you really need to be here.

And we also will be at the San Francisco MySQL Users Group where I will present Goldilocks and the Three Queries — MySQL EXPLAIN Explained on Wednesday the 25th.

In between, we will be attending the Oracle Leaders Summit. This is an unique event where the leaders of the users groups of various Oracle Family Products meet to discuss better ways of organizing user communities. This year we are lucky to have MySQL leaders from Asia, Europe and the Americas attending.

SCaLE is the premier open source event in Southern California and the dedicate staff works hard to keep the price down to $70 including an amazing Expo. For those of you out of the Los Angeles area, the event is at the LAX Hilton and you can take the shuttle buss and never leave the hotel (except to visit Carl’s Junior next door for a Western Bacon Cheeseburger) or fight traffic on the infamous 405 freeway.

MySQL Tech Tour Event – El Segundo, CA
Wednesday, February 8, 2012
http://www.oracle.com/go/?&Src=7314534&Act=249&pcode=WWMK11042736MPP127

MySQL Tech Tour Event – Raleigh, NC
Thursday, February 2, 2012
http://www.oracle.com/go/?&Src=7314534&Act=248&pcode=WWMK11042736MPP126

SET optimizer_trace="enabled=on";
SELECT Name FROM City WHERE ID=999;
SELECT trace into dumpfile '/tmp/foo' FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;

And the trace follows (sadly WordPress kills the indentations, PDF of trace here)


{
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `world`.`City`.`Name` AS `Name` from `world`.`City` where (`world`.`City`.`ID` = 999)"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`world`.`City`.`ID` = 999)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "multiple equal(999, `world`.`City`.`ID`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "multiple equal(999, `world`.`City`.`ID`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal(999, `world`.`City`.`ID`)"
}
]
}
},
{
"table_dependencies": [
{
"database": "world",
"table": "City",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
{
"database": "world",
"table": "City",
"field": "ID",
"equals": "999",
"null_rejecting": false
}
]
},
{
"rows_estimation": [
{
"database": "world",
"table": "City",
"rows": 1,
"cost": 1,
"table_type": "const"
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "1",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
]
}
},
{
"refine_plan": [
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
}

Be sure to read:

MySQL Optimizer tracing: Query Execution Plan descriptions beyond EXPLAIN
http://jorgenloland.blogspot.com/2011/10/optimizer-tracing-query-execution-plan.html

MySQL Optimizer tracing: how to configure it
http://guilhembichot.blogspot.com/2011/09/optimizer-tracing-how-to-configure-it.html

MySQL Optimizer: new EXPLAIN for data-modifiers
http://glebshchepa.blogspot.com/2011/10/optimizer-new-explain-for-data.html

Thanks!

MySQL 5.6.4 & MySQL Cluster 7.2 availbale from http://Labs.MySQL.Com

And very soon fellow MySQL Community Manager Keith Larson and I will be hitting the road, First stop is the Southern California Linux Expo which features as MySQL Day this year. Then we head to the upper half for the state for the Oracle Leadership Summit to help the Leaders of MySQL User Groups grow their communities. And on the last night of that event, we will head up the 101 into San Francisco on the 25th to talk to the amazing San Francisco MySQL Users Group. Erin O’Neil, the co-coordiantor, wanted a presentation, make that an in depth presentation on the use of EXPLAIN. So I am like Santa’s elf crafting a presentation while the calender counts down the holiday season.

And later this year you can catch the MySQL Community Team at ConFoo, POSSCON, Collaborate, and PHPUK among other events. If you know of an event where we can help, please let me know!

SCaLE MySQL Day (Friday) Presentations
• MySQL Replication (Keith Larson)
• The MySQL Storage Engines Landscape (Colin Charles)
• A Closer Look at MySQL Cluster: An Architectural Overview (Max Mether)
• Playing in the Same Sandbox: MySQL and Oracle (Lynn Ferrante)
• Care and Feeding of a MySQL Database for Linux Administrators (Dave Stokes)
• MySQL Update (Dave Stokes)

Solomon Chang is going to present a four hour MySQl Replication Tutorial (but I am unsure of the date) that will be great.

Hope to see you there!

Yes, your MySQL DBA is hard to shop for during the holiday season. Their needs are few² or expensive. So what can you get them on the cheap that will make them happy?

Gift Ideas

1. T-shirts are probably the majority of your DBA’s attire, despite your best efforts.
   1. Zazzle offers a World’s Best DBA t-shirt. You may also be able to get away with remark that the Nobel Prize committee had to cut costs due to the economy being what it is and this is what they sent.
      Zazzle also offers I am a DBA in third normal form , SELECT FROM friends WHERE lame = ‘no’, and a SELECT SUM(WOOD_QTY) FROM WOOD_CHUCK WHERE CHUCK = TRUE t-shirts feature snarky DBA related humor. Do not ask for an explanation from your DBA on the humor³.
   2. Printfection offers Have you ____ your MySQl DBA today?
   3. I am the DBA not the help desk, DBAs do it on tables, and Bars, scars and varchars — the life of a DBA are available at Cafepress
   4. There’s no place like 127.0.0.01 can be purchased at Thinkgeek
   5. And Amazon sells ROSES ARE #FF0000, VIOLETS ARE #0000FF ALL MY BASE BELONG TO YOU.
2. Books — Very few new MySQl Books this year. The most notable is Effective MySQL Optimizing SQL Statements by Ronald Bradford. In 2012 we will see many more new titles. So buy a gift card to your DBA’s favorite book seller so they can get:
   1. A new edition of High Performance MySQL: Optimization, Backups, Replication, and More will be a must buy. The first edition is a classic.
   2. Oracle press will be publishing MySQL Workbench Data Modeling and Development, Effective MySQL Advanced Replication Techniques, and Effective MySQL Backup and Recovery.
   3. Mastering phpMyAdmin 3.4 for Effective MySQL Management is due out May 1st, 2012 from Packt.

   You can also go non-DBA specific for presents such as movie passes, gift cards, and other generic gifts. But the above are your best choices for your DBA this time of year. And if you have special DBA gifts, please share them here!!

   Notes:

   1. No, you are not going to get a Large Hadron Collider if you ask. There is only one and in a year there will be a fully functioning Lego kit or iPhone app that will prove all the Higgs bosons particles the world needs — and it will not be that many.
   2. Maslow’s hierarchy of needs shows MySQL DBA are already at the top of the needs pyramid just by being MySQL DBAs.
   3. Unless you really need a nap!