steps to set up slave database

[mk132]

Edit: I didn't see Colin's message. That looks like what I need!

[Colin F]

Edit this line in your config.php file:
$config['Database']['dbtype'] = 'mysql';

to:
$config['Database']['dbtype'] = 'mysql_slave';

[Floris]

Master == read/write
Slave = read

[mk132]

I've read too many threads and can't find the answer...

1. I use mySQL replication and have the database replicated to another server.
2. I have added the correct values to the "$config['SlaveServer']..." lines of config.php.
Then:
Nothing changes. I don't see queries going to the slave.

Is there a step 3?
I see a reference to changing a class name in some thread here, but I'm quite confused.

Thanks.