cost of empty fields

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Hi folks,


we've got an quite large table with 17 columns and now >15k rows.
The table works also as an journal will continously grow day by day. 
Man of the columns (mostly text) aren't needed anymore if the tuple 
has reached a certain age. 
So I thought about clearing the unnecessary fields of old tuples 
to save resources. Does it bring any performance improvement ?

Of I could splitt off this table an working- an archive- table 
and map them together in some views - someday I probably *will* 
do it - but our applications are not yet ready for this.


thx
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