Importing into a compressed table

Question

Is importing into a compressed table effective?
I mean is data get compressed when using imp utility to load into a compressed table?
from the oracle doc :
Compression occurs while data is being bulk inserted or bulk loaded. These operations include:
·Direct Path SQL*Loader
·CREATE TABLE … AS SELECT statement
·Parallel INSERT (or serial INSERT with an APPEND hint) statement

Answer 1

A quick journey over to the SQL Reference manual, where things like table-create options are defined, gives us the following comment:
table_compression
The table_compression clause is valid only for heap-organized tables. Use this clause to instruct the database whether to compress data segments to reduce disk use. This clause is especially useful in environments such as data warehouses, where the amount of insert and update operations is small. The COMPRESS keyword enables table compression. The NOCOMPRESS keyword disables table compression. NOCOMPRESS is the default.
When you enable table compression, Oracle Database attempts to compress data during direct-path INSERT operations when it is productive to do so. The original import utility (imp) does not support direct-path INSERT, and therefore cannot import data in a compressed format. You can specify table compression for the following portions of a heap-organized table:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_7002.htm#i2095331