"alter table mytable order by my_column" is too slowly, why? Please help me.

Thu, 23 Aug 2001 13:43:12 -0700 

I execute this SQL with mysql 3.23.39 (all platform, Windows98, Windows2000 and Redhat 
Linux 7.1), but it's very very slowly.

    alter table mytable order by my_column;

mytable has 3,000,000 rows, my_column is define as char(15).

But when mytable has 1,000,000 rows, it's very fast, about 1.5 minute.




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