At my house we have 500+ books and I know how to create databases and such.this is a long term project that I have planned and I am wondering if it could be considered as an extracurricular or would it be better to use my skills in creating databases at a larger scale like school library .
Yes! That would most definitely be considered an extracurricular, and I'd say it's an interesting one as well.
I would suggest that you create a database both at home and in a school library because it would show an admissions officer evolution with your interest in databases/comp sci. If this is an extremely significant extracurricular, you could talk about it in your essays, depicting your start with creating databases at home and eventually growing into a larger scale with school libraries.
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Would the same apply to the admissions officers of the ivy league ? Thank you.