Inserting user-defined DTrace probes into MySQL source code is very useful to help user identify the performance problems in the application level and the database server, In addition, the cost of the USDT probe is basically neglectable. Each probes inserted into the src can be enabled by adding the code like:

 If (PROVIDER_PROBE_ENABLED()

{

                PROVIDER_PROBE(arg0,…);

}

The steps to add DTrace probes into MySQL is very straightforward.

Step 1: Figure out what probes are needed to insert into the source code

This is the difficult part that requires you understand the MySQL implementation details. Generally, it is good to insert probes to clarify the DB response time distribution …

The hot tub is still having an issue. I suspect that there is an air
bubble past the primary pump. Nothing seems to be working to get the
air bubble out. Either the pump is having issues, aka is clogged, or
priming is not working. The reason I suspect that it is priming is
because during the priming stage nothing is happening.

What I want is for the tub to work.

What would I like long term? Find a way to raise the temperature from
104 to 108. The tub has some sort of safety feature built in so that
this can not happen. I've studied the board that controls the hot
tub, and except for one jumper, I've been able to document them all
(and I suspect the one jumper is just for turning the ozone creator
on and off). To learn more I turned to google :)

Surprisingly little is out there on hot to hack your hot tub. No
conversations on any …

This is a review of Webyog's MONyog MySQL monitoring tool. The product is still in beta and has some rough edges, but holds promise. Its design includes some interesting architectural decisions I think will help distinguish it from MySQL's own Monitoring and Advisory Service.

With MySQL 5.0 the database provides trigger functionality on INSERT, REPLACE, UPDATE and DELETE.

Those of you who know some other RDBMS know, that there are also some system events where one would like to have triggers.

Unfortunately MySQL does not (yet) provide such functionality. This is sad because as database administrator this would be sometimes very helpful.

But you can build your own LOGON and STARTUP trigger.

MySQL provides some hooks for these events...

Complete Story (PDF 160 kbyte).

I was unable to attend JavaOne this year since I was at the Red Hat conference in San Diego. Still, I heard good things, especially about a new language and framework called Scala/lift.  Both Java Flex guru Bruce Eckel and scalability guru David Pollak commented on Scala. (More on that next week.) 

So my only way to find out what was going on was through blogs and news releases.  If you missed JavaOne, check out the links below.  Interesting highlights include Sun's announcement of …

With MySQL 5.0 the database provides trigger functionality on INSERT, REPLACE, UPDATE and DELETE.<br> Those from you who know some other RDBMS know, that there are also some system events where one would like to have triggers.<br> Unfortunately MySQL does not (yet) provide such functionality. This is sad because as database administrator this would be sometimes very helpful.<br> But you can build your own LOGON and STARTUP trigger.<br> MySQL provides some hooks for these events...<br>

mysql> check table noneofyourbusiness quick ;

Table                            Op     Msg_type  Msg_text 
 noneofyourbusiness   check status          OK  
1 row in set (56 min 26.29 sec)

You know you want to go. Its going to be in Tokyo, Japan. Having passed by the Narita airport quite some number of times, I’ve always wondered what was beyond those walls.

MySQL UC-J: September 11-12 2007

I would sincerely encourage all folk in the Asia-Pacific region, using or dabbling in MySQL to attempt to be there. Thats right, I’m calling on you folk from Singapore, Malaysia, China, Korea, Thailand, and how can we forget our beloved Australia & New Zealand (though I’m not sure if flying to Tokyo is any less harrowing an experience than flying to San Francisco).

Flights are going to be shorter, they are going to be cheaper, and you’re going to get to see Tokyo. More importantly, if you pre-register, rumor has it, you will not be paying an attendance fee. Seats will be snapped up fast. Session lineups are amazing. What more can I say besides its going to be a great & fun experience for all.

…

MySQL AB will hold its first ever MySQL users conference in Asia this September. Over the course of two days, the 'MySQL Users Conference Japan 2007' will feature a special executive keynote presentation, more than 15 business and technical sessions, and exhibition booths. About half of the sessions are presented in English with English-Japanese simultaneous translation.

This is a review of Webyog's MONyog MySQL monitoring tool. The product is still in beta and has some rough edges, but holds promise. Its design includes some interesting architectural decisions I think will help distinguish it from MySQL's own Monitoring and Advisory Service. MONyog overview MONyog starts an HTTP listener on your machine. After you start the program, you point your Web browser at localhost:9999. Your browser talks to MONyog, which talks to one or many MySQL servers.