Re: Best way to index IP data?

[Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>]

Pomarede Nicolas <npomarede(at)corp(dot)free(dot)fr> writes:
> And it's true for IPv6 too, storing an IP that refer to an end point and 
> not a subnet is requiring twice as much data as needed, because the 
> netmask would always be ff:ff:ff:..:ff
> So, for people dealing with large database of IPs, it would be nice to be 
> able to save 50% of the corresponding disk/cache/ram space for these IPs.

There seem to be a number of people in this thread laboring under the
illusion that we store a netmask as a mask.  It's a bit count (think
/32 or /128) and occupies a whole one byte on disk.  Killer overhead,
for sure.

			regards, tom lane