Re: Log in Storm Caused Database Crash

Matthew and Stefan,

Thank you for your points. I will definitely go through those logs.

During that interval, I made sure from v$session (machine) that all the sessions are from the application server itself. This made me feel that the spike is because of the application server configuration during load times.

On Sun, Oct 1, 2017 at 9:58 PM, Matthew Parker <dimensional.dba_at_comcast.net> wrote:

> You can also look at you listener log to see number of connection attempts
> to system.
>
> If it was a true overwhelming connection storm then you will also probably
> have information in the alert.log where errors are being reported spawning
> against the database.
>
>
>
> *Matthew Parker*
>
> *Chief Technologist*
>
> *Dimensional DBA*
>
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>
>
> *From:* oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_
> freelists.org] *On Behalf Of *Ravi Teja Bellamkonda
> *Sent:* Sunday, October 1, 2017 9:45 PM
> *To:* Upendra nerilla <nupendra_at_hotmail.com>
> *Cc:* oracle-l <oracle-l_at_freelists.org>
> *Subject:* Re: Log in Storm Caused Database Crash
>
>
>
> 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_at_hotmail.com>
> 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_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.
>
>
>
> [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
>

-- 
Thanks & Regards,
Ravi Teja Bellamkonda
Ph: (816)-905-7577.









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