Index file creation #16
Description
Phase 2 would produce four indexes which should be named ad.idx, te.idx, da.idx, and pr.idx respectively corresponding to indexes 1, 2, 3, and 4, as discussed above.
Given the sorted files terms.txt, pdates.txt, prices.txt and ads.txt, create the following four indexes: (1) a hash index on ads.txt with ad id as key and the full ad record as data, (2) a B+-tree index on terms.txt with term as key and ad id as data, (3) a B+-tree index on pdates.txt with date as key and ad id, category and location as data, (4) a B+-tree index on prices.txt with price as key and ad id, category and location as data. You should note that the keys in all 4 cases are the character strings before colon ':' and the data is everything that comes after the colon.