Define the term dangling pointer. Describe how the unique-id scheme helps in detecting dangling pointers in an object-oriented database.
Answer to relevant QuestionsConsider the example on page 435, which shows that there is no need for deswizzling if hardware swizzling is used. Explain why, in that example, it is safe to change the short identifier of page 679.34278 from 2395 to 5001. ...Construct a B+-tree for the following set of key values: (2, 3, 5, 7, 11, 17, 19, 23, 29, 31) Assume that the tree is initially empty and values are added in ascending order. Construct B+-trees for the cases where the number ...Suppose that we are using extendable hashing on a file that contains records with the following search-key values: 2, 3, 5, 7, 11, 17, 19, 23, 29, 31 Show the extendable hash structure for this file if the hash function is ...How does data encryption affect index schemes? In particular, how might it affect schemes that attempt to store data in sorted order?The indexed nested-loop join algorithm described in Section 13.5.3 can be inefficient if the index is a secondary index, and there are multiple tuples with the same value for the join attributes. Why is it inefficient? ...
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