Explain why a physical OID must contain more information than a pointer to a physical storage location.
Answer to relevant QuestionsIf physical OIDs are used, an object can be relocated by keeping a forwarding pointer to its new location. In case an object gets forwarded multiple times, what would be the effect on retrieval speed? Suggest a technique to ...What is the difference between a primary index and a secondary index? Explain the distinction between closed and open hashing. Discuss the relative merits of each technique in database applications.Consider the account relation as shown below.a. Construct a bitmap index on the attributes branch-name and balance, dividing balance values into 4 ranges: below 250, 250 to below 500, 500 to below 750, and 750 and above.b. ...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? ...
Post your question