Indexing Data Structure

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Vivek Kantariya

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Indexing is used to speed up access to desired data. E.g. author catalog in library A search key is an attribute or set of attributes used to look up records in a file. Unrelated to keys in the db schema. An index file consists of records called index entries. An index entry for key k may consist of An actual data record (with search key value k) A pair (k, rid) where rid is a pointer to the actual data record A pair (k, bid) where bid is a pointer to a bucket of record pointers Index files are typically much smaller than the original file if the actual data records are in a separate file. If the index contains the data records, there is a single file with a special organization.

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