I wish to calculate tf-idf weight. So, for locating idf I want large database of various documents. I Quickly have make other db with colums-(word/count). So my real question is "how can i find last database of "idf" (or count) coef for words"? Many search engines like google are utilizing this db, maybe it's possible find this db in Internet for various languages? I'd rather not get this to db on my own.

idf is Inverse Document Frequency. Quite simply, the regularity from the term gets into the denominator. What exactly you would like are word frequency tables. Wiktionary:Frequency lists should enable you to get began. Bear in mind these lists treat inflected types of a thing because the same word e.g. be, is, am, are, ....