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    S-Index: a Hybrid Structure for Text Retrieval

    Advances in Databases and Information Systems '97

    St Petersburg, 2nd - 5th September 1997

    AUTHORS

    D. Dervos, P. Linardis & Y. Manolopoulos

    ABSTRACT

    Two textbase indexing methods enjoying wide applicability are the inverted index and the Superimposed Coding based Signature File (SC-SF).

    The former is most efficient in query processing, whereas the latter excels in storage utilization.

    Building on previous results, we propose a new hybrid structure (S-Index) which has a tunable performance.

    At the one extreme end, S-Index turns into a signature file with zero information loss, so that queries are processed faster than in ordinary SC-SF.

    At the other extreme end, S-Index turns into an inverted index.

    The advantage of the proposed access method is that the textbase index may now be tailored to the query profiles of user classes: for frequently queried textbase sections S-Index performs like an inverted index, whereas the bulk of the textbase is indexed in the form of a signature file.

    The S-Index structure is presented in detail, together with performance analysis results.

    PAPER FORMATS

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