It's an option for lazy people who don't want to bother with custom database settings for their game. Huge database will load more players compared to the other database size options.
Released: 3 November 2012
This is how your database size drop down options should look like after using this XML.
How to install huge database for FM 2013
Step 1Extract the downloaded zip file. You'll get new game settings.xml
Step 2Move new game settings.xml in your Football Manager 2013 panels folder:
Win Vista/7: C:\Users\<username>\Documents\Sports Interactive\Football Manager 2013\panels\
Win XP: C:\Documents and Settings\<username>\My Documents\Sports Interactive\Football Manager 2013\panels\
Mac OS X: /Users/<username>/Documents/Sports Interactive/Football Manager 2013/panels/
Create the folder "panels" if it doesn't exist.
Step 3Start a new game.
If you still can't see the option, go to Preferences > Interface, and hit the "Clear Cache" button and then the "Reload Skin" button to the bottom right.