Explain the main differences between the database and IR systems mentioned in Table 27.1. Table 27.1 Table
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Explain the main differences between the database and IR systems mentioned in Table 27.1.
Table 27.1
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Table 27.1 A Comparison of Databases and IR Systems Databases IR Systems 1 Structured data Unstructured data Schema driven I Relational (or object, hierarchical, and network) model is predominant Structured query model Rich metadata operations Query returns data Results are based on exact matching (always correct) No fixed schema; various data models (e.g., vector space model) Free-form query models I Rich data operations - Search request returns list or pointers to documents I Results are based on approximate matching and measures of effectiveness (may be imprecise and ranked)
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Related Book For
Fundamentals Of Database Systems
ISBN: 9780133970777
7th Edition
Authors: Ramez Elmasri, Shamkant Navathe
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