The running time of double hashing is Theta(m) since each possible (h1(k), h2(k)) pair yields a distinct probe sequence. Hence the performance of double hashing is better.
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Which technique has the greatest number of probe sequences?
Here the hash table is of size 13 with h1(k) = k mod 13 and h2(k) = 1 + k mod 11. Since 14 = 1 (mod 13) and 14 = 3 (mod 11), the key 14 is inserted into empty slot 9.
Hash list is the list of hashes of the blocks in a set file. Hash tree is a generalization of the hash list in which leaves are labeled with the hash of a data block and every non-leaf node is hash of the labels of its children.
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Hash tree is used in effective data verification in distributed systems.
Hash trees are used in distributed systems for efficient data verification. Hash tree used hashes instead of the full files, hence they are efficient. Because Hashes are ways of encoding files that are much smaller than the actual file itself.
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Which of the following is a widely used form of the hash tree?
The general form the hash tree which is used widely is the Tiger tree hash. It uses a binary hash tree, usually has a data block size of 1024 bytes and uses the Tiger hash.
Hash tree allows direct as well as sequential access of the records. Hashing is used for direct access and indexing is generally used for the sequential access.
Hash tree is generally known as Merkle tree after Ralph Merkle who patented it in 1979. Typically Merkle trees have a branching factor of 2, meaning that each node has up to 2 children.
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