Show how to compute existence bitmaps from other bitmaps. Make sure that your technique works even in the presence of null values, by using a bitmap for the value null.
Answer to relevant QuestionsHow does data encryption affect index schemes? In particular, how might it affect schemes that attempt to store data in sorted order?Let relations r1 (A, B, C) and r2 (C, D, E) have the following properties: r1 has 20,000 tuples, r2 has 45,000 tuples, 25 tuples of r1 fit on one block, and 30 tuples of r2 fit on one block. Estimate the number of block ...Write pseudocode for an iterator that implements indexed nested-loop join, where the outer relation is pipelined. Use the standard iterator functions in your pseudocode. Show what state information the iterator must maintain ...Show how to derive the following equivalences by a sequence of transformations using the equivalence rules in Section 14.3.1. a. σθ1 ∧ θ2 ∧ θ3 (E) = σθ1 (σθ2 ...Give an example of an expression defining a materialized view and two situations (sets of statistics for the input relations and the differentials) such that incremental view maintenance is better than recomputation in one ...
Post your question