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There is a major crawl at this time, with some reporting full crawls simultaeously with the start of the update or just prior, while others are not crawled until after the update is complete.
For several months there's been spidering of sites going on all month, even in between the major updates, but this only represents a small percentage of sites and while it may or may not affect ranking changes, it doesn't affect the entire index.
There was a lengthy discussion of what's been called The Everflux Effect early in July:
We've been having a lot of threads starting with questions about this all month long, which makes it hard to find all the relevant information related to it. Also, the volume of posts is making it harder to find other information relevant to Google.
Let's confine discussion of the mid-month spidering and minor update pattern to one thread, to help everyone find the information they need more easily.
[edited by: Marcia at 3:13 am (utc) on Sep. 21, 2002]
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Does anyone have any clue why would that happen? Did anyone experience something similar (ie, getting in and out of the index within 2 days ;-)? All feedback is highly appreciated!
My new site is doing just that. It drops in and out everyday, but it's also getting hit everyday by ggb and when it is listed it's fresh.
I wouldn't worry too much, if its a new site or just never been picked up before then more than likely it will settle in a bit after the update... whenever that happens.... ;)
How long does google deepcrawl your site for.. as I mentioned.. I am a yahoo store.. I dont know if I should even bother trying to update for the dance at the end of this month... should I? Or is it probable that google already crawled and left and my efforts right now would be wasted as it does not matter if i then update today or two weeks from now?
Basically, update a site with customers and sales in mind. If there's traffic and you have more merchandise to put up and sell, every day delayed can be lost revenue. You just keep your navigation consistent.
For changes affecting site design my personal opinion is that mid-month is better, to make the next EOM crawl and get in the following round - which would be 45 days off. I generally figure that what goes up prior to update (last week of the month) will get in the following month.
Sites pop in and out now, but it's unnecessary stress to expect anything until the update following the end of the current month.