Changing an Existing Fragmentation Strategy on a Table

You can redefine a fragmentation strategy on a table if you decide that your initial strategy does not fulfill your needs. When you alter a fragmentation strategy, the database server discards the existing fragmentation strategy and moves records to fragments as defined in the new fragmentation strategy.

The following example shows the statement that originally defined the fragmentation strategy on the table account and then shows an ALTER FRAGMENT statement that redefines the fragmentation strategy: 
CREATE TABLE account (col1 INT, col2 INT) 
   FRAGMENT BY ROUND ROBIN IN dbsp1, dbsp2;
ALTER FRAGMENT ON TABLE account
   INIT FRAGMENT BY EXPRESSION 
   col1 < 0 IN dbsp1,
   col2 >= 0 IN dbsp2;

If an existing dbspace is full when you redefine a fragmentation strategy, you must not use it in the new fragmentation strategy.