Database Tuning (MOSC)

MOSC Banner

OS monitoring detected 'spikes' in cpu usage but can't get a clear clue from AWR

edited Jun 23, 2016 4:39AM in Database Tuning (MOSC) 12 commentsAnswered ✓

We have Oracle 12.1.0.2 running on AIX 7.1 platform, it is 'single instance database, no RAC', size about 30GB with normal user sessions 200.. OS monitoring tool that can provide graph (bar graph) to show each minute's CPU usage at server level during entire testing time about 7 hours; meanwhile in database we have AWR in 30 minutes interval.  Based on graph, there were '4 spikes' in CPU usage  at 13:18, 13:35, 13:50,14:00 hour.  However, from AWR we can't pin-point the problem since SQLs reported had no timestamp with them, and rest is average reading.

The cpu spikes were short duration maybe less  than 1 minutes.

Can anyone suggest where to look for?  I reported all high-CPU SQLs and high-physicalreads SQLs, but they were in other 30 times during test also.

Howdy, Stranger!

Log In

To view full details, sign in to My Oracle Support Community.

Register

Don't have a My Oracle Support Community account? Click here to get started.

Category Leaderboard

Top contributors this month

Instructions for posting

×

1. Select a discussion category from the picklist.


2. Enter a title that clearly identifies the subject of your question.


3. In the body, insert detailed information, including Oracle product and version.


Please abide by the Oracle Community guidelines and refrain from posting any customer or personally identifiable information (PI/CI).


Cloud / Fusion customers - Our Cloud community has moved! Please go to Cloud Customer Connect .


New to My Oracle Support Community? Visit our Welcome Center

MOSC Help Center