Compress=Y in Exp and Expdp

Question

I have been using oracle export/import as well as datapump export/import on a regular basis in building our database environments. I noticed the difference between the normal export and the datapump export.
Export(exp) has the compress=Y/N option whereas i didnt see the option in Datapump.
I was looking at the Documentation and found that
http://download.oracle.com/docs/cd/B14117_01/server.101/b10825/dp_export.htm#i1005864
"A parameter comparable to COMPRESS is not needed. " --This is what described in the documentation.
Does Datapump export does automatic compresssion?
I have tried exporting a table(size-14G) from our Database with "norows" option using normal export and tried Datapump export using Metadata_only option and generated the Sql for the metadata definitions.
The script from the normal export shows the initial extent size of 2g whereas SQLfile from the datapump import shows 260M.
Now,which is the best approach for creating objects while Data movement across Databases.
Please clarify.

Answer 1

using compress=y in export means:
exp determines the total size of the segment, uses that as the size of the new initial extent, and sets the next extent to 10 percent of the initial extent.
It is a remnant from the V6 days when there were only dictionary managed tablespaces, and many DBAs (including yours truly) where micromanaging table size and free space size.
That said, even Oracle admits it was not their brightest moment, and you shouldn't use it, ever.
Obviously introducing expdp, in a LMT world, was the moment to get rid of it.
Sybrand Bakker
Senior Oracle DBA