Bitmap segmentation

Details Bitmap segmentation Bitmap segmentation

1997-02-28

2000-05-23

Amsbury, Wayne

Data processing: database and file management or data structures

Database design

Data structure types

707 2, 707 3, 707 10, 707502, G06F 1730

Patent

active

060675403

ABSTRACT:
A method and apparatus for segmenting bitmaps in a bitmap index is provided. A segmented bitmap includes a plurality of bitmap segments that are used to indicate which records in a body of records that is associated with the segmented bitmap satisfy a particular criteria. Each bitmap segment contains a string of bits that correspond to a corresponding range of records in the body of records. There may be gaps between the ranges represented by the bitmap segments when, for example, the body of records does not contain records in a particular range. For the purposes of retrieval, compression, de-compression, locking and logging, the database system treats each bitmap segment as a distinct data item.

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