I am working with db2 v7.2 aix 5.2

I need to change the extent size of production database,
is it true I have no chose except ,
1- create new database with proper extent size
2- Using db2look and db2move for exporting and importing data to new database. is it true?
If the size of my database was 500 gig what should I do , it will take long 3 days to export/import data.

please advise

Since V7.2 is no longer supported by IBM, sounds like a good time to upgrade to Version 8.

I assume you mean you want to change the extent size of one or more tablespaces. The database may have a defaut extent size for new tablespaces, but you can override that when you create each tablespace.