Database Tuning (MOSC)

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Variance of response times

edited Sep 19, 2019 5:04AM in Database Tuning (MOSC) 11 commentsAnswered

I am often astonished about the variance of response times on different Oracle versions on different Windows operating systems on different hosts.

Queries that normally finish with under 1 mili second sometimes can sometimes take also up to 10 seconds.

Similar with longer queries which finish normally under few seconds can sometimes take also up to several minutes.

The queries I am speaking about are executed often with different binding parameters and are well tuned.

This happens on servers with multiple cores and that are not extremely busy (regarding the CPU usage). The databases have quite a log of SGA (between 5 and 100 GB), so that they more than 99.1% of the requests are in memory. The disks/storage used are good and have much capacity.

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