Google has always logged your IP with your searches, and held on to those logs (after 18 months, they partially anonymize the data so it's harder to track back to a specific IP). That will keep happening.
On March 1, those logged searches will be associated with your Google profile (unless you take steps to clear your history - although again, that won't actually delete anything off Google's servers. None of this ever goes away completely.)
From that point on, if you're logged in to G+ on the same browser you're searching on, Google will be able to associate those searches directly with your profile. if you use a different browser to search on, google will log the IP as usual, but should've associate them directly with your profile.
The safest way to separate your searches is just to use another search engine - but you should still use separate browsers for G+ and everything else, to avoid things like AdSense cookies, Google Analytics, etc - Google tracks us in a lot of ways, and it will associate all of that with your profile if you're logged in on the same browser.
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Google has always logged your IP with your searches, and held on to those logs (after 18 months, they partially anonymize the data so it's harder to track back to a specific IP). That will keep happening.
On March 1, those logged searches will be associated with your Google profile (unless you take steps to clear your history - although again, that won't actually delete anything off Google's servers. None of this ever goes away completely.)
From that point on, if you're logged in to G+ on the same browser you're searching on, Google will be able to associate those searches directly with your profile. if you use a different browser to search on, google will log the IP as usual, but should've associate them directly with your profile.
The safest way to separate your searches is just to use another search engine - but you should still use separate browsers for G+ and everything else, to avoid things like AdSense cookies, Google Analytics, etc - Google tracks us in a lot of ways, and it will associate all of that with your profile if you're logged in on the same browser.