The database size of leagues & teams patch is 8.238 KB (without new career settings !),
think the game allows a maximum ~4.000 KB before it crashes
i am not sure where s the limit, it need more testing...
to compare:
original FIFA 11 DB = 2.589 KB
2016-17 (Default squads > Online) DB = 2.753 KB
2016-17 (Default squads > Offline) DB = 3.176 KB
like someone said,
there are some leagues splitted into 2-4 groups
it would be better maybe to reduce to 1 group, deleting the others to reduce the database size
i ll probably need to split the database into 2 or 3 smaller databases anyway,
my first plan was:
DB 1. - FIFA 17 leagues + full UEFA (from leagues & teams) + china-1 + topteams (rest of africa, rest of asia, ...)
DB 2. - FIFA 17 leagues (not all maybe) + CAF (from leagues & teams) + AFC (from leagues & teams) + OFC (from leagues & teams) + topteams (rest of africa, rest of asia, ...)
DB 3. - FIFA 17 leagues (not all maybe) + CONCACAF (from leagues & teams) + CONMEBOL (from leagues & teams) + china-1 + topteams (rest of africa, rest of asia, ...)
not sure wich FIFA confederations got the most leagues,
maybe put AFC somewhere else...
if i split it like above,
and keep all countries from 1 confederation (maybe reorganise some lower leagues)
this way,
-at each DB (1-2-3) u can have:
* Competions (FULL Champions League / Europa league at DB1, Copa Libertadores at DB3, ...)
* top teams from other confederations for World cup of clubs
* Top players for transfers of some important leagues (Brazil-1, China-1, ...) at each DB