On Wed, May 30, 2012 at 12:25 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Alexander Korotkov <aekorotkov@gmail.com> writes: > On Tue, May 29, 2012 at 11:42 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote: >> While I'm looking at this, is the first test involving >> effective_cache_size bulletproof either? In particular, is >> avgIndexTuplesPerPage clamped to be strictly greater than 1?
> It's based on collected statistics on already inserted tuple sizes. Since > tuple sizes are measured after possible toasting, I don't see the way > for avgIndexTuplesPerPage to be less than 1.
Yeah, but if it could be *equal* to one, you've got a zero-divide there.