Well you are close …
that is how they decide and judge the new algo, they use old database new database combine them etc … But a new algo is any tweak as it changes ranking… hey did’nt I just say something like that in my post ??? hhhahaha The new moon is just about the time the algorythm holds steady
thus a new algo, the reason for the multiple databases is to check out if they have some spam patterns that are coming to the top. But all and all any change results in a new algorythm …. maybe it gives higher credit for more outgoing links, and a larger amount of keywords, maybe for larger pages, maybe more incoming links, any change whatsoever results in a new algorythm as the algorythm is any change in judgement that decides the results.
Round and round it goes where it stops nobody knows.
Actually I did not drink the blood Ark I took a bite out of the still warm heart after I pulled it from the cooling corpse … Maybe a little lead poisoning …. ; )