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I have noticed in the last couple of days that the total number of questions is not very steady. At one point there were 942k questions, then 920k, then after some time they came back to 942k, and today it shows 930k. Is this a bug?

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For some of the sorts, certain questions are excluded; for example, anything voted -4 or under is not part of the "hot" tab and will not show in that question count:

Why are there 403,517 "hottest" questions?

I'm fairly sure this is what you're referring to.

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this could be the reason will observe the tab this time – keshav.veerapaneni Sep 20 '10 at 11:19

I would imagine the question count is cached, so the servers don't have to select count(*) from Posts where PostTypeID = 1 on the tables every time a user views a page with the view count. Or they have updated the software in a way that affected the count somehow.

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But why would the number go down then? – Martin Smith Sep 19 '10 at 11:52
@Martin - deleted questions – ChrisF Sep 19 '10 at 11:53
@ChrisF - 12,000-22,000 deleted questions seem implausible. – geoffc Sep 19 '10 at 12:34
@geoffc - I must admit I didn't do the maths ;) – ChrisF Sep 19 '10 at 14:26

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