Invention Grant
- Patent Title: Helper scan in a database management system
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Application No.: US15798656Application Date: 2017-10-31
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Publication No.: US10691690B2Publication Date: 2020-06-23
- Inventor: Brian L. Baggett , Thomas A. Beavin , Oliver Draese , Shuanglin Guo , Andrei F. Lurie , Terence P. Purcell , Shengxi Suo
- Applicant: International Business Machines Corporation
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Edell, Shapiro & Finnan, LLC
- Agent Richard Wilhelm
- Main IPC: G06F16/24
- IPC: G06F16/24 ; G06F16/2453 ; G06F16/22 ; G06F16/2455

Abstract:
A method, system and computer program product are provided. A first index scan of records of a database table is performed. A first index used by the first index scan is specified in a DBMS query statement as being ordered by one or more field values of one or more fields of the first index. A second scan of the database table is performed to determine whether each respective record of the second scan is qualified based on one or more fields of the each respective record of the second scan and a predicate. A lookup data structure is built indicating whether each of the respective records of the second scan is qualified. The lookup data structure is used to determine whether a record of the first index scan is qualified when the lookup data structure becomes available.
Public/Granted literature
- US20190129999A1 HELPER SCAN IN A DATABASE MANAGEMENT SYSTEM Public/Granted day:2019-05-02
Information query