Google Terminology - Matt cutts Google quality engineer transcript

Hello Everyone I am back, Ok Why don't we start off with a really interesting question. Dazzling donna wrote in all the way from Louisiana she says matt I mentioned before I love to see do the fine type of post, find terms that you at Google use that we non Googlers might get confused about. Things like data refresh etc. You may have defined them in various places but one sheet type list will be great.



Very good question, at some point I need to do a blog post about host, Host Vs Domain and bunch of stuff like that. Some of people had been asking question about June 27th to July 27th so let me talk that a little bit more in the context of a data refresh vs an algorithm update versus an index update. So ill use the metaphor of a car. Back in 2003 we were crawling the web and indexing the web once in every month when we did that that was called an index update algorithms could chance, data could change so everything could chance just in one shot. So that was pretty big deal webmasterworld will name those updates. Now that we pretty much crawl and index some of our datas every single day it's a ever flux its always going on through a process the biggest change in the people's tendency are algorithm updates. You don't see any index updates any more because when we moved away from the monthly update cycle the only time you might see them is you might be completing an index which is incompatible with the old index. So for example if you do simulation of CJK its China, Japan and Korea to under stand this you might have to completely change your index and go to an other index in parallel. So index updates are relatively rare , algorithm updates basically are when we change our algorithm. So may be its with the scoring a particular page you said you know Pagerank matters this much less or this much more or something like that. And those can happen pretty much any time so we call that asynchronous because whenever we get an algorithm update and the tally rates positively and it improves quality, in improves relevance we go ahead and push that out and an other smaller change is called data refresh that is essentially like you are changing the input to the algorithm , changing the data that the algorithm works on.



So an index update with a car metaphor would be like changing a large section of the car things like changing the car tyre whereas an algorithm update is like changing a part in the car may be a changing out the engine for a different engine or changing or other main parts of the car, a data refresh is more like changing the gas in your car every one or 2 weeks or 3 weeks your change will always go in and will see how the algorithm works on that data. So for most part data refreshes are more common one thing we got to be very careful about is how safely we check them, some data refreshes happens all the time so for example we compute Pagerank continually and continuously so its always back of Machines refining Pagerank based on incoming data and pagerank goes out all the time anytime when we make an update to the index it happens pretty much every day.
By contrast some algorithms are updated every week every couple of weeks so those are data refreshes that are happening in a slower page. So the particular algorithm that people are interested in, on June 27th and July 27th those algorithms, actually those algorithms happen to be live for over a year and a half so you are seeing data refreshes that you are seeing that people see as a way for sites to rank.

In general if your site has been affected go back to your site take a fresh look at see if there is anything that might be exceedingly over optimized or maybe hanging out in SEO forums for such a long time that I need to have a regular person come in and take a look at the site and see if its ok to me. Or if you tried all the regular stuff and still it looks Ok to you then I would keep building regular good content and make the site very useful and if the site is useful then Google should fight hard to make sure its ranking where it should be ranking. That's about the most I can give about June 27th and july 27th data refreshes because it does goes into our secrets also a little bit but that hopefully gives you a little bit of an idea about the scale the magnitude of different changes.


Algorithm changes happen a little more rarely and data refreshes are always happening and sometimes it happen from day to day or sometimes week to week or month to month

Thanks
Matt Cutts

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