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Five node splitting operations occurred when an entry is inserted into a B-tree. Then how many nodes are written?

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Five node splitting operations occurred when an entry is inserted into a B-tree. Then how many nodes are written?
a) 14
b) 7
c) 11
d) 5

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Answer: c
Explanation: If s splits occur in a B-tree, 2s + 1 nodes are written (2 halves of each split and the parent of the last node split). So, if 5 splits occurred, then 2 * 5 + 1 , i.e. 11 nodes are written.

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