No doubt a Sony Reader has a database, but AFAIK, it's not accessible like the Kobo database. That's why Kobo is better than Kindle too.
I've 6000 ebooks and PDFs on my Kobo Sage now and can find by collection, title, author, series and by recent, reading, unread, finished etc.
Search for a book good, without Kindle overhead of indexing content. The Kobo will easily search contents of current read and last two or three but not contents of each book in the whole library. Calibre can do that.
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