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Sparse index dense index - PowerPoint PPT Presentation

CS 587/410, Spring 2008

CS 587/410, Spring 2008. Relational Database Systems /Database Internals Len Shapiro, len at pdx.edu Syllabus: www.cs.pdx.edu/~len/587

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Layers of a DBMS

Layers of a DBMS . Query. Query optimization Execution engine Files and access methods Buffer management Disk space management. Query Processor. Query execution plan. The Memory Hierarchy. Main Memory Disk Tape. 5-10 MB/S transmission rates 2-10 GB storage average time to

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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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Indexes

Indexes. An index on a file speeds up selections on the search key fields for the index. Any subset of the fields of a relation can be the search key for an index on the relation. Search key is not the same as key (minimal set of fields that uniquely identify a record in a relation).

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Sparse index dense index - PowerPoint PPT Presentation

CS 587/410, Spring 2008

Layers of a DBMS

Indexes

Indexes