ORDER BY, LIKE !!?

Hi,

I have :
- a table with more than 2.000.000 records. It looks like this :

+----------------------------------+----------------------------------+-----
--+
| Field | Type
|Length |
+----------------------------------+----------------------------------+-----
--+
| fileno | int4
|4 |
| size | int4
|4 |
| type | char2
|2 |
| date | datetime
|8 |
| host | varchar()
|32 |
| name(with path) | varchar()
|1024 |
+----------------------------------+----------------------------------+-----
--+
- a PostgreSQL 6.3
- 4.1 AIX system
- postmaster is started with the following parameters :
-i -B 1024 -S -o '-F -S 10240' -D/opt/pgdata

I want to select only few (100) rows, [from a given row,] having an order
criterium,
faster (< 2 min) :
" SELECT * FROM File WHERE name LIKE '%/u/projects%' [AND name LIKE ...]
ORDER BY name;"
[from the beginning of the row 750000]

OR

" SELECT * FROM File WHERE name LIKE '%/u/projects%' [AND name LIKE ...]
ORDER BY date;"
[from the beginning of the row 750000]

Could someone help me ?

Thanks,
rex