Shared scans utilizing query monitor during query execution...

Details Shared scans utilizing query monitor during query execution... Shared scans utilizing query monitor during query execution...

2007-08-28

2008-07-29

Lewis, Cheryl (Department: 2167)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07406485

ABSTRACT:
A system for data base management using memory devices holding a database containing tables of data occupying extents. A database engine reviews each query to determine an extents list of extents containing the data needed by that said query. A query monitor then re-orders the extents lists so that extents are retrieved and stored in a buffer cache for more efficient use when executing the queries. The database engine retrieves needed extents from the memory devices, as ordered in the extents lists, and stores those extents in the buffer cache. The database engine then executes one or more queries on the data in the extents in the buffer cache to determine respective results.

REFERENCES:
patent: 5758146 (1998-05-01), Schiefer et al.
patent: 5794229 (1998-08-01), French et al.
patent: 5832508 (1998-11-01), Sherman et al.
patent: 6470330 (2002-10-01), Das et al.

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