The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 1997
Filed:
Sep. 02, 1993
Shih-Gong Li, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, system and program for determining a set of tables from which data can be redistributed between nodes in a parallel database. First, a list of candidate tables from those stored in the memories associated with a plurality of nodes in the parallel database is established. The list is ordered according a workload of each of the candidate tables. Next, each of the candidate tables is tested to determine whether it can be scanned at each of the plurality of nodes at which the candidate table is stored within a predetermined time period. Any candidate table which can be scanned within the predetermined time period is added to the set of tables from which data can be redistributed. Once the set of tables for redistribution are established, data sets, or buckets, within the redistribution tables are selected. The selected buckets are redistributed from the plurality of nodes to a receiving node. The receiving node is a new node to the parallel database system or an underutilized node in the parallel database system.