Ok, here are the last rows for the vacuum analyze verbose
INFO: free space map contains 154679 pages in 39 relations
DETAIL: A total of 126176 page slots are in use (including overhead).
126176 page slots are required to track all free space.
Current limits are: 160000 page slots, 5000 relations, using 1476 kB.
L'interrogazione è stata eseguita con successo, ma senza risultato, in
1332269 ms.
and I attach the complete explain analyze of the complex query.
Giving more detail about the tables involved in the query could be not
so easy as they are a lot.
The joins are made between columns that are primary key in a table and
indexed in the other.
All the where clausole are on indexed colums (perhaps there are too many
indexes...)
Thanks a lot.