This is easily solved in Postgres. You dont do alters with default, or non null values. Alters become fast [enough] and bearable, even at scale. http://justcra

This is easily solved in Postgres. You dont do alters with default, or non null values. Alters become fast [enough] and bearable, even at scale. http://justcramer.com/2011/11/10/scaling-schema-changes/ http://justcramer.com/2011/11/10/scaling-schema-changes/