On Mon, Jul 30, 2018 at 9:42 PM, David Raymond <david.raym...@tomtom.com>
wrote:

> Doesn't sound quite right to me.
>
> No matter the index you have to search through it to find the spot to do
> the insert. Both are going to do that search only once. An insert on a
> unique index isn't going to search through it for existence, then promptly
> forget what it just did and do it all over again to do the insert. It's
> going to start the insert and find the spot where the new item would go. If
> the spot's free it succeeds, if it's taken then it fails. There is no need
> for a second search.
>
>
Hence my original question: why would a Unique Index be any worse?
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