Creating a new index blocks. It doesn't matter as all objects go into
the index even if an object doesn't have a given field.
On Fri, Dec 18, 2009 at 11:04 PM, John Nunemaker <nunema
...@gmail.com> wrote:
> Rick commented on a post of mine about mongo with a question regarding
> indexes:
>
http://railstips.org/2009/12/18/why-i-think-mongo-is-to-databases-wha... > "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
> that? Thanks!
> John
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