Is this too much chained rows ? How to prevent chained rows ?

Hi,
Due to performance issue on my database, I came across "Chained/migrated Rows articles" ... and ran script to check chained rows .....
I have chained rows in 2 tables but only one is worth mention. It is a table that has 50 CLOB columns and has 1.1mil records .....
After running the script for chained rows I get 500.000 chained rows out of this 1.1mil ....
I will now do as explaind in the forums and books, reinsert this rows ..... to try fix this
So my question would be, what do i need to do to prevent , if I actually can anything at all to not get so many chained rows ? I understand that some rows can't be prevented to have chains ...
Database block is 8192 ..... Avarage row length(stats) of this table is 6093, est.size 8.9G .... PCTFree is 10 by default ...
At this moment i'm getting warning :"PCTFREE too low for a table" and is at 1.3...
Do I need to increase database block and/or increase PCTFree to some range between 20-25? If yes, can i somehow increase block only on this table cause recreating database that is 79GB would take some time ...?
Performance is big issue, disk space is not ...
Thank you.
Kris

user10702996 wrote:
The whole insert row contains data about one newspaper article ..... So what we did for better search performances is to "cache" every word from this article into defined CLOB column but ordered by first character ... so words staring with A are in CHAR_1 clob column B is in CHAR_B and so on ....
How are you querying the data ?
From your description, it looks as if you need to look at Oracle's "text" indexing - I am basing this comment on the assumption that you are trying to do things like: "find all articles that reference aardvarks and zebras", and turning this into a search of the "A lob" and the "Z lob" of every row+ in the table. (I'm guessing that your biggest performance problem is actually the need to examine every row, rather than the problem of chained rows - obviously I may be wrong).
If you use context (or intermedia, the name changes with version) you need only store the news item once as a LOB then create a text index on it - leaving Oracle to build supporting structures that allow you to run such queries fairly efficiently.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
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