brew install mysql

my.sql

### mysql
A "/etc/my.cnf" from another install may interfere with a Homebrew-built
server starting up correctly.

To connect:
    mysql -uroot

To have launchd start mysql at login:
    ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
Then to load mysql now:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
Or, if you don't want/need launchctl, you can just run:
    mysql.server start
==> /usr/local/Cellar/mysql/5.6.16/bin/mysql_install_db --verbose --user=rex --basedir=/usr/local/Cellar/mysql/5.6.16 --datadir=/usr/local/var/mysql --tmpdir=/tmp
==> Summary
🍺  /usr/local/Cellar/mysql/5.6.16: 9425 files, 349M


### memcached
To have launchd start memcached at login:
    ln -sfv /usr/local/opt/memcached/*.plist ~/Library/LaunchAgents
Then to load memcached now:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.memcached.plist
Or, if you don't want/need launchctl, you can just run:
    /usr/local/opt/memcached/bin/memcached
==> Summary
🍺  /usr/local/Cellar/memcached/1.4.17: 10 files, 172K, built in 14 seconds

Try brew info mysql and brew info memcached, etc.