4 million sounding data

[Jason FU]

I have 4 million sounding data to display in MapServer. I have not problem
in uploading the data to both PostgreSQL 8.0.3 and Oracle 10g. But it seems
that MapServer cannot afford to work with such an amount of data. When I
turn on the sounding layer, the php mapscript simply times out. When I turn
off the time-out threshold, it simply stops without any error. When I try to
browse all other map works, they perform as usual. Then I lower the rowid to
about 12,000 in Oracle, MapServer displays some some points after struggling
for quite a while (about 15 minutes!).

Any suggestion?

Thanks.

Jason