timing with ldb

[tridge at samba.org]

Hi Matthieu,

These stats will change radically with the new ldb scaling work that I
was discussing with Metze and others last week. I expect that the size
of the indexes will drop by about 8x to 10x, and the size of the SDs
will drop to almost nothing. I think the record overhead will also
drop a lot.

Let's try your experiment again in a couple of months when we have a
prototype of the ldb scaling code.

Cheers, Tridge