Re: Log in Storm Caused Database Crash

  • From: Ravi Teja Bellamkonda <raviteja.bellamkonda7@xxxxxxxxx>
  • To: Upendra nerilla <nupendra@xxxxxxxxxxx>
  • Date: Sun, 1 Oct 2017 21:45:03 -0700

Hi Upendra,

Thank you for your response. This is an internet facing application and we
were expecting a burst load to check for the capacity of the system. Is
there a way to measure what no of sessions in the database is breaking
point. I was doubting if any Sub-Optimal Connection Pooling might have
caused this.

Highly appreciated your help here.

On Sun, Oct 1, 2017 at 7:39 PM, Upendra nerilla <nupendra@xxxxxxxxxxx>
wrote:

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


------------------------------
*From:* oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on
behalf of Ravi Teja Bellamkonda <raviteja.bellamkonda7@xxxxxxxxx>
*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.

[image: Inline image 1]


Logons cumulative also increased during this interval.

[image: Inline image 2]

Logons cumulative were 1237 in total in the before AWR report. Any
suggestions are highly appreciated.
--
Thanks & Regards,
Ravi Teja




-- 
Thanks & Regards,
Ravi Teja Bellamkonda

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