Robert Ullmann wrote:
look at the first three digits of the revid, when they are the same, they would be in the same "block" (this is assuming 1M revs/block as I suggested). You can check any title you like (remember _ for space, and % escapes for a lot of characters, but a good browser will do that for you in a lot of cases) Since the majority of edits are for a minority of titles (some version of the 80/20 rule applies), most edits/revisions will be in the same block as a number of others for that page.
Not only do you need to keep them in the same block. You also need to keep them inside the compression window. Unless you are going to reorder those 1M revisions to keep revisions to the same article together.