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Everything fails, Monitor Everything


From the recent MySQL Conference a number of things resonate strongly almost daily with me. These included:

  1. Guy Kawasaki - Don?t let the bozos grind you down.
    • Boy, the bozos have ground me down this week. I slept for 16 hrs today, the first day of solid rest in 3 weeks.
  2. Paul Tuckfield - YouTube and his various caching tip insights.
    • I’ve seen the promising results of Paul Tuckfield’s comment of pre-fetching for Replication written recently by Farhan.
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Xen builds available again!

Check the forum announcement for more information installation instructions and compatibility notes.

Please report any issues and/or feedback at the Virtual Appliances Discussion Forums (forums.virtualappliances.net).

LAMP

http://virtualappliances.net/download/archive/VirtualAppliancesLAMP-xen-1.0.113.tar.bz2
http://virtualappliances.net/download/archive/VirtualAppliancesLAMP-xen-1.0.113.zip

Cacti

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SQL parser in rage(l)

For the mysql-proxy I'm exploring several ways to write a small SQL parser for the internal commands. As I want to use basic SQL to modify the config and the internal operations I need a parser. Some time ago I used lemon which is used in sqlite3, which is easier to use than yacc, but you still have to write the lexer/tokenizer.

This time I looked into ragel which is a state-machine compiler.

Time get rid of code like this:

....
} else if (0 == g_ascii_strncasecmp(s->str + NET_HEADER_SIZE + 1, 
     C("update proxy_config set value=0 where option=\"proxy.profiling\""))) {
....

Ragel is a bit different than lex/yacc. Ragel combines the two into one and builds a full state-machine for the input stream. Just one file, one state-machine for the parser and lexer.

%%{
  machine sql;

  SELECT = /SELECT/i;
  FROM   = …
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Google Patents

So I came across Google Patents the other day and thought that it was a pretty cool idea! Searching for whether a patent already exists had been a pretty hard job in the past, so having a readily available resource such as Google is a fantastic step forwards.

Especially in light of the recent Microsoft ‘FUD’.

Here’s a patent I came across whilst browsing around the various database related patents that exist out there:

http://www.google.com/patents?id=zLsYAAAAEBAJ&dq

Electronic shopping and merchandising system

Abstract
The present invention provides a merchant system for online shopping and merchandising. The merchant system architecture provides great flexibility for a merchant to adapt the merchant system to their …

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Negative number of threads connected?

Today, I noticed that one of my machines was giving a negative number for threads connected.

Anyone care to share why the threads would be displayed as a negative number in mysqladmin ex output:

| Aborted_connects           | 0          |
| Connections | 186 |
| Max_used_connections | 0 |
| Threads_connected | -31 |
| Aborted_connects | 0 |
My first database

I grew up on a farm. Lest anyone automatically load up their preconceived notions of farmers, my Dad was (and is) very interested in computers and purchased the original IBM PC back in the early/mid 80's. He found a lot of practical use in the Lotus 1-2-3 spreadsheet program, and could fly through the keyboard shortcuts (I guess they weren't really shortcuts in those days, as there wasn't a mouse) fast enough to put him on the same level with any Unix geek today with Emacs or Vi.

In the 90's, I remember him buying our 486/66 with 16MB of RAM from Micron and describing it as a computer that would "peel out on the lawn." My dad is a tractor-guy and has always been obsessed with horsepower. He still likes to rev up his …

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SQL parser in rage(l)

For the mysql-proxy I'm exploring several ways to write a small SQL parser for the internal commands. As I want to use basic SQL to modify the config and the internal operations I need a parser. Some time ago I used lemon which is used in sqlite3, which is easier to use than yacc, but you still have to write the lexer/tokenizer.

This time I looked into ragel which is a state-machine compiler.

Time get rid of code like this:

....
} else if (0 == g_ascii_strncasecmp(s->str + NET_HEADER_SIZE + 1, 
     C("update proxy_config set value=0 where option=\"proxy.profiling\""))) {
....

Ragel is a bit different than lex/yacc. Ragel combines the two into one and builds a full state-machine for the input stream. Just one file, one state-machine for the parser and lexer.

%%{
  machine sql;

  SELECT = /SELECT/i;
  FROM   = /FROM/i;
  WHERE  = …
[Read more]
This will be huge

It's not new (Yahoo! Pipes is already there) but the Visual Studio integration is the kicker.  Check it out:  http://www.popfly.ms/Overview/

Connector/Net 5.0.7 has been released

Hi,

MySQL Connector/Net 5.0.7 a new version of the all-managed .NET driver for MySQL has been released.

This is a bug fix release for the current production branch of Connector/Net.

Version 5.0.7 is suitable for use with any MySQL version including MySQL-4.1, MySQL-5.0, MySQL-5.1 beta or the MySQL-6.0 Falcon "Preview".

It is now available in source and binary form from the Connector/Net download pages at http://dev.mysql.com/downloads/connector/net/5.0.html and mirror sites (note that not all mirror sites may be up to date at this point of time - if you can't find this version on some mirror, please try again later or choose another download site.)

Bugs fixed

  • Bug #27269 MySqlConnection.Clone does not mimic SqlConnection.Clone behavior
  • Bug #27289 Transaction is not …
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VMWare: The greatest thing since sliced bread

So if you like to try out new things, and you're not using VMWare yet, get with the program!Really, though - it's so easy now (and the VMServer is free) . Just download and install.VMWare lets you run mini virtualized server environments within your current operating system. Yea, there is a little overhead, but for testing and trying out new databases, configurations, applications, it's

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