On Wed, Oct 12, 2011 at 4:26 PM, Kevin Grittner
<Kevin.Grittner@wicourts.gov> wrote:
>> But it matters a *lot* when they heap pages are not in shared
>> buffers
>
> Yeah, obviously it matters more if you actually need to add a random
> disk read.
To be fair the indexes are also random I/O. So the case that really
matters is when the index fits in RAM but the heap does not.
--
greg