Query Processing and Optimization
Query Processing and Optimization
Query Processing and Optimization
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• Per Index<br />
• Base relation<br />
Relevant Statistics, cont.<br />
• Indexed attribute(s)<br />
• Organization, e.g., B + -Tree, Hash, ISAM<br />
• Clustering index?<br />
• On key attribute(s)?<br />
• Sparse or dense?<br />
• Number of levels (if appropriate)<br />
• Number of first-level index blocks: b 1<br />
• General<br />
• Available main memory blocks: N<br />
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