Me again... in the Certification Study Guide it is writen that is more efficient to add 2 (or many) indexes at a time then adding them individualy... but they don't say why !!!!!
I stand by my initial advice:
*If you can afford a lock on the table to last a little longer you can go with creating the 2 indexes at once.* *If not create the one by one... i'm sure some other queries will be honoured between those ALTER statements.*
-- Gabriel PREDA Senior Web Developer