Method for allocating either private or shared buffer memory for

Details Method for allocating either private or shared buffer memory for Method for allocating either private or shared buffer memory for

1996-04-18

1998-08-25

Asta, Frank J.

Data processing: database and file management or data structures

Database design

Data structure types

395872, 707 7, 711118, 711130, 711121, G06F 1300

Patent

active

057992100

ABSTRACT:
A method and apparatus are provided for allocating buffer memory for database sort operations. A database parameter is set to determine whether and how direct write buffers are to be allocated for sort operations. If the parameter is set to a first value, then no direct write buffers will be used, and sort operations will write to disk through a buffer cache. If the parameter is set to a second value, then direct write buffers will be used to perform writes to disk. Then size and number of direct write buffers to be used will be determined by the values set in other database parameters. If the parameter is set to a third value, direct write buffers will be allocated a portion of the memory available to perform the sort operation. The size and number of direct write buffers will be determined in accordance with database formulae that are designed to optimize sort and data write performance.

REFERENCES:
patent: 4967341 (1990-10-01), Yamamoto et al.
patent: 5089985 (1992-02-01), Chang et al.
patent: 5179662 (1993-01-01), Corrigan et al.
patent: 5210870 (1993-05-01), Baum et al.
patent: 5237661 (1993-08-01), Kawamura et al.
patent: 5491810 (1996-02-01), Allen
patent: 5581736 (1996-12-01), Smith
patent: 5640561 (1997-06-01), Satoh et al.

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