منابع مشابه
Linear Hashing
DEFINITION Linear Hashing is a dynamically updateable disk-based index structure which implements a hashing scheme and which grows or shrinks one bucket at a time. The index is used to support exact match queries, i.e. find the record with a given key. Compared with the B+-tree index which also supports exact match queries (in logarithmic number of I/Os), Linear Hashing has better expected quer...
متن کاملLinear Hashing
Consider the set H of all linear (or affine) transformations between two vector spaces over a finite field F . We study how good H is as a class of hash functions, namely we consider hashing a set S of size n into a range having the same cardinality n by a randomly chosen function from H and look at the expected size of the largest hash bucket. H is a universal class of hash functions for any f...
متن کاملL Linear Hashing
Linear Hashing is a dynamically updateable diskbased index structure which implements a hashing scheme and which grows or shrinks one bucket at a time. The index is used to support exact match queries, i.e., find the record with a given key. Compared with the BC-tree index which also supports exact match queries (in logarithmic number of I/Os), Linear Hashing has better expected query cost O(1)...
متن کاملLH* — Linear Hashing for
LH* generalizes Linear Hsshing to parallel or distributed RAM and disk files. An LH* file can be created from objects provided by any number of distributed and autonomous clients. It can grow gracefully, one bucket at a time, to virtually any number of servers. The number of messages per insertion is one in general, and three in the worst case. The number of messages per retrieval is two in gen...
متن کاملLinear spectral hashing
Spectral hashing assigns binary hash keys to data points. This is accomplished via thresholding the eigenvectors of the graph Laplacian and obtaining binary codewords. While calculation for inputs in the training set is straightforward, an intriguing and difficult problem is how to compute the hash codewords for unseen data. A second problem we address is the computational difficulties when usi...
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ژورنال
عنوان ژورنال: BRICS Report Series
سال: 1997
ISSN: 1601-5355,0909-0878
DOI: 10.7146/brics.v4i16.18808