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Overflow page - PowerPoint PPT Presentation

CPSC 461 Final Review I

CPSC 461 Final Review I. Hessam Zakerzadeh Dina Said. 9.1) What is the most important difference between a disk and a tape?. 9.1) What is the most important difference between a disk and a tape?

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518 views • 25 slides

Hashing

Hashing. Selection Queries. B+-tree is perfect, but.... to answer a selection query (ssn=10) needs to traverse a full path. In practice, 3-4 block accesses (depending on the height of the tree, buffering) Any better approach?.

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224 views • 22 slides

Indexes

Indexes. A Heap file allows record retrieval: by specifying the rid , or by scanning all records sequentially Sometimes, retrieval of records by specifying the values in one or more fields is needed (semantic search or value-based query), e.g.,

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367 views • 21 slides

Index tuning

Index tuning. Hash Index. Overview. Linear Hashing. This is another dynamic hashing scheme, an alternative to Extendible Hashing. LH handles the problem of long overflow chains without using a directory , and handles duplicates .

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142 views • 13 slides

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Overflow page - PowerPoint PPT Presentation

CPSC 461 Final Review I

Hashing

Indexes

Index tuning