Default sort-ordering in MySQL (ALTER TABLE … ORDER BY …;)

Question

Assume that the default ordering of a MySQL-table (ISAM) is changed by executing:

ALTER TABLE tablename ORDER BY columnname ASC;

From now o

Answer 1

Physically ordering a column can save loads of IO. It's perfectly legitimate method used in advanced systems to speed query time. You just need to reorg the data every now and then so its stays clustered. Just because some folks haven't heard of it doesn't mean it doesn't exist. - 25 year advanced DB design veteran.