Re: Log in Storm Caused Database Crash

From: Upendra nerilla <nupendra_at_hotmail.com>
Date: Mon, 2 Oct 2017 02:39:54 +0000
Message-ID: <CY1PR10MB0683003B805BC1B3FB935449D87D0_at_CY1PR10MB0683.namprd10.prod.outlook.com>

Is this an internet facing application or internal? If it is external facing application, investigate if there was DoS type attack or a spike in the user sessions due to any issues with application servers?

If you need to isolate where the connections originated from, you could look into DBA_Hist views.

You may want to start with this one.. https://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_3125.htm#REFRN23400

DBA_HIST_ACTIVE_SESS_HISTORY - Oracle Help Center<https://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_3125.htm#REFRN23400> docs.oracle.com
DBA_HIST_ACTIVE_SESS_HISTORY. DBA_HIST_ACTIVE_SESS_HISTORY displays the history of the contents of the in-memory active session history of recent system activity.

Also look into any application server logs and see if there were any issues with the application server itself..

-Upendra

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From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> on behalf of Ravi Teja Bellamkonda <raviteja.bellamkonda7_at_gmail.com> Sent: Sunday, October 1, 2017 9:25 PM
To: oracle-l
Subject: RE: Log in Storm Caused Database Crash

Hi List,

We ran into an issue recently and wanted some help in figuring out this issue.

Database was not responding and one thing from AWR observed before fail over was the login storm.

[Inline image 1]

Logons cumulative also increased during this interval.

[Inline image 2]

Logons cumulative were 1237 in total in the before AWR report. Any suggestions are highly appreciated.

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Thanks & Regards,
Ravi Teja











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Received on Mon Oct 02 2017 - 04:39:54 CEST