On 02/16/2015 08:48 PM, Petr Jelinek wrote:
> On 17/02/15 01:57, Peter Geoghegan wrote:
>> On Mon, Feb 16, 2015 at 4:44 PM, Petr Jelinek <petr(at)2ndquadrant(dot)com>
>> wrote:
>>> We definitely want this feature, I wished to have this info many times.
>>
>> I would still like to see a benchmark.
>>
>>
>
> Average of 3 runs of read-only pgbench on my system all with
> pg_stat_statement activated:
> HEAD: 20631
> SQRT: 20533
> SQRTD: 20592
>
>
So using sqrtd the cost is 0.18%. I think that's acceptable.
cheers
andrew