Skip to content

Oracle 12c Adaptive Query Optimization overhead

Oracle 12c Adaptive Query Optimization overhead published on Комментариев к записи Oracle 12c Adaptive Query Optimization overhead нет

Trying to find out overhead of new Adaptive Query Optimization feature

use perf to find out process cpu usage ( eg:perf stat -e task-clock -p 9576 sleep 5 )
Screen Shot 2016-08-24 at 21.45.07

Screen Shot 2016-08-24 at 21.46.40
to disable adaptive features I used

alter system set optimizer_features_enable='11.2.0.1';

so the result is:

3000 hpares

3000 hpares

3000 hpares

3000 hpares

3000 hpares

avg

adaptive off

1724,46

1786,04

1696,22

1687,89

1690,89

1717,10

adaptive on

1803,79

1815,98

1966,07

1804,35

1819,35

1841,91

overhead

4,40

1,65

13,73

6,45

7,06

6,78

ps: lotshparses.sql link

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *

Primary Sidebar

Яндекс.Метрика