Rick commented on a post of mine about mongo with a question regarding
"What’s the index story like on Mongo? Can you create/drop indexes on the
fly, or does it lock the collection?"
I responded with:
"You’d have to hit the mailing list. I assume lots of data plus a new index
on an existing key would lock/slow things up. Good question"
And decided to ask the mailing list for him. How does it work adding an
index to a key that is in a bunch of documents in a large collection? Also,
if you add an index to a key that is new to a collection is there any hit to