By Arnab Bhattacharya
Fundamentals of Database Indexing and Searching provides famous database looking out and indexing options. It specializes in similarity seek queries, exhibiting easy methods to use distance services to degree the inspiration of dissimilarity.
After defining database queries and similarity seek queries, the ebook organizes the most typical and consultant index constructions in response to their features. the writer first describes low-dimensional index buildings, memory-based index constructions, and hierarchical disk-based index constructions. He then outlines important distance measures and index constructions that use the gap info to successfully clear up similarity seek queries. targeting the tough dimensionality phenomenon, he additionally provides numerous indexing equipment that in particular take care of high-dimensional areas. additionally, the booklet covers facts aid recommendations, together with embedding, quite a few information transforms, and histograms.
Through quite a few real-world examples, this ebook explores how you can successfully index and look for info in huge collections of knowledge. Requiring just a uncomplicated laptop technological know-how historical past, it truly is obtainable to practitioners and complex undergraduate students.
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Additional info for Fundamentals of Database Indexing and Searching
Hi (k), . . } where each hi (k) produces a single bit. At level i of the tree, if hi (k) = 0, the left branch is traversed; © 2015 by Taylor & Francis Group, LLC 18 Fundamentals of Database Indexing and Searching otherwise, the right branch is accessed. In this way, any key can be stored and retrieved. A simple and effective example of g(k) is the bit representation of the key. 1 [Dynamic Hashing]. The overflow buckets are organized as a binary search tree. The successive bits of the key guide the path.
For every overflow, only one primary bucket is split. The bucket that is split is not necessarily the one that overflows. It is controlled by the split pointer which cycles among all the primary buckets. Suppose there are n primary buckets. The split pointer s and the level l of a linear hashing structure are initially at 0. n. It then gets reset to 0, and the level of the structure gets incremented to l + 1. Thus, in a linear hashing scheme, full buckets are not necessarily split, and buckets that are split are not necessarily full.
It is easy to see that more than one key can hash to the same location for a hash function. This phenomenon is called collision and the ways to handle collisions are called collision resolution mechanisms. In a database context, the hash locations are disk pages or buckets that can contain a multiple number of keys and the corresponding objects. Hence, the hash function maps a key to a bucket. The searching of a key within a bucket is a simple linear scan. Hence, the concept of collision is replaced by that of overflow , which happens when there is no more space in a hash bucket to store any more keys.