If you go to the MySQL web site, and do a search on data type integer, you’ll notice something strange. The first result is a MySQL newsletter from May 2010.

It wasn’t always like this. A few years ago I blogged about how Sun broke MySQL. Sun went on to claim that MySQL working out of the box was something that was broken with MySQL, even though lots of sysadmins every where relied on this to get servers up and running quickly.

If you compare the search with what they have on Google, you’ll see that the first result and the many results below are *all* relevant.

Why do large organizations break what works?

Just notes for myself on adding more MySQL databases without shutting down the master database.

on existing slave:

copy data dir from /var/lib/mysql and data from /var/run/mysqld to new slave database:

copy /etc/my.cnf from old slave to new slave
add entry for new server-id

start existing slave:

start new slave:

on masterdb:
e.g.:

test on master:
create database repl;

check on slave:
show databases; /* should show new database */

test on master:
drop database repl;

check on slave:
show databases; /* new database should be dropped */

Now it’s time to turn this into an automated shell script with Expect in there.