Title:
計算機負荷見積システム、計算機負荷見積方法、計算機負荷見積プログラム
Document Type and Number:
Japanese Patent JP5088668
Kind Code:
B2
Abstract:
A load estimating system which estimates a load of a database, includes a storage unit, a record number calculating module, and an access number calculating module. The storage unit includes structure information defining a structure of a table in said database, first distribution information indicating probability distribution of condition variables of a query for said table, and second distribution information indicating probability distribution of values in said table. The record number calculating module calculates the average number of selected records which meet conditions defined by-condition variables, based on said structure information, said first distribution information and said second distribution information. The access number calculating module calculates the number of block accesses for said query based on the average number of selected records.
Inventors:
Sasaki Morio
Application Number:
JP2007059055A
Publication Date:
December 05, 2012
Filing Date:
March 08, 2007
Export Citation:
Assignee:
NEC
International Classes:
G06F12/00
Domestic Patent References:
| JP3108036A | ||||
| JP63220323A |
Other References:
石井卓二, 林克己, 和田憲一, 稲葉靖夫,リレーショナルDBMS(AIM/RDB)の性能見積り手法について,第33回(昭和61年後期)全国大会講演論文集(II),社団法人情報処理学会,1986年10月 3日,p. 891~892
Attorney, Agent or Firm:
Minoru Kudo