Give examples of select statements that are
a. Speeded up due to the addition of the B+ tree index shown in Figure 9.22
b. Slowed down due to the addition of the B+ tree index shown in that ?gure.
a. Find the record for judy.
b. Suppose each record contains an Id ?eld and there already exists an index on Id. Then the insertion of a new record can be done e?ciently with that index. The addition of the B+ tree slows the insertion down since additional overhead is required in order to insert a new entry into the tree.
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