'Search key values' presentation slideshows

Lecture 8 on Physical Database

Lecture 8 on Physical Database. DBMS has a view of the database as a collection of stored records, and that view is supported by the file manager which has a view of the database as a collection of pages, and that view is supported by the disk manager. The DBMS, file manager and disk manager.

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Today

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Hashing

Hashing. Reference: Chapters: 11,12. Motivation. The primary goal is to locate the desired record in a single access of disk. Sequential search: O(N) B+ trees: O(log k N) Hashing: O(1) In hashing, the key of a record is transformed into an address and the record is stored at that address.

431 views • 27 slides

Hashing

Hashing. Reference: Chapters: 11,12. Motivation. The primary goal is to locate the desired record in a single access of disk. Sequential search: O(N) B+ trees: O(log k N) Hashing: O(1) In hashing, the key of a record is transformed into an address and the record is stored at that address.

293 views • 27 slides

B + -Tree Index Files

B + -Tree Index Files. Takahiko Saito. Introduction. The most widely used of several index structures that maintain efficiency despite insertion and deletion Takes the form of a balanced tree in which every path from the root of the tree to a leaf of the tree is of the same length.

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Appendix C

Appendix C. File Organization & Storage Structure. Agenda. Definition Types of Storage Types of File Organization. Definition. Logical record & physical record File organization Access method. Types of Storage. Primary Secondary Volatile Non-volatile. Types of File Organization.

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Appendix C

Appendix C. File Organization & Storage Structure. Agenda. Definition Types of File Organization. Definition. Logical record & physical record File organization Access method. Types of File Organization. Heap (unordered) Sequential (ordered or sorted) Hash (direct or random) Index.

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Appendix C

Appendix C. File Organization & Storage Structure. Agenda. Definition Types of File Organization. Definition. Logical record & physical record File organization Access method. Types of File Organization. Heap (unordered) Sequential (ordered or sorted) Hash (direct or random) Index.

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B + -Tree Index Files

B + -Tree Index Files. Indexing mechanisms used to speed up access to desired data. E.g., author catalog in library Search Key - attribute to set of attributes used to look up records in a file. An index file consists of records (called index entries ) of the form

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