Oracle 10g: Table Compress

Guys,
I was reading an article about table compression that I was reading for data warehousing environment.
http://www.oracle.com/technology/products/bi/db/10g/pdf/twp_data_compression_10gr2_0505.pdf
I didnt understand couple of things like
Oracle’s compression algorithm is based upon eliminating duplicate values in each block - what does eliminating duplicate values in each block mean
ALTER TABLE ... MOVE COMPRESS works in 10g what is its equivalent in Oracle 9i.
Also is there a concept of table compression in Oracle 9i
Any inputs/suggestions would help
Thanks

what does eliminating duplicate values in each block meanThat a compression method. Have only once the same info. That doesn't drop from the table duplicate rows. Important phrase is here :
"Duplicate values in all the rows and columns in a block are stored once at the beginning of the block, in what is called a symbol table for that block. All occurrences of such values are replaced with a short reference to the symbol table."
Also is there a concept of table compression in Oracle 9iThere is such thing :
http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_73a.htm#2128735
Nicolas.

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>
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>
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>
If compression could increase the size of a block, then the database does not apply it to the block.
>
That is misleading because, of course, the size of the block can't change. You should really read that as
>
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>
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