Re: OEM reporting listener down but listener not actually down

From: Jack van Zanen <jack_at_vanzanen.com>
Date: Mon, 2 Dec 2019 11:48:51 +1100
Message-ID: <CAFeFPA_VSq7BsJLYGc3-xNTxDKxwsG=knOZEnWNV7G-TRk-ZmA_at_mail.gmail.com>

Hi Shane

I know of and have used that document thanks. The symptoms are different however.. that document assumes it is reported down for prolonged period of time... in our case we simply get 1-2 alerts and than it is business as usual...

Jack van Zanen

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On Mon, Dec 2, 2019 at 11:30 AM Shane Borden <sborden76_at_yahoo.com> wrote:

> This is a known OEM issue and there is a MOS note that addresses this and
> I actually used it last week. I just don’t have it handy to post here
> right now.
>
> Basically OEM doesn’t reconfigure the target host when the listener is
> relocated for one reason or another. Without doing what is in the MOS note
> and If you put the scan back on the original host the notification will
> clear.
>
> Shane Borden
> sborden76_at_yahoo.com
> Sent from my iPhone
>
> On Dec 1, 2019, at 7:20 PM, Jack van Zanen <jack_at_vanzanen.com> wrote:
>
> 
> intermittently we get some alert from OEM about listener being down.
>
> Target name=*LISTENER_SCAN3_telstraexa1-000_1*
> <https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2FNSW-ATP-GRID.snl.7net.com.au%3A7799%2Fem%2Fredirect%3FpageType%3DTARGET_HOMEPAGE%26targetName%3DLISTENER_SCAN3_telstraexa1-000_1%26targetType%3Doracle_listener&data=01%7C01%7CJVanZanen%40Seven.com.au%7C5514208b3d2848d8fe9f08d774d613ee%7Cb359291241554399b790752c894d2935%7C0&sdata=Pww2ktObyuQu4vBRxuWvcmAGkXXJIozv%2F8nHJP1ABHE%3D&reserved=0>
> Categories=*Availability*
> Message=*The listener is down: TNS-12545: Connect failed because target
> host or object does not exist .*
> <https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2FNSW-ATP-GRID.snl.7net.com.au%3A7799%2Fem%2Fredirect%3FpageType%3Dsdk-core-event-console-detailEvent%26issueID%3DE43696ECA26F42148CCCD6EC4862F4A9&data=01%7C01%7CJVanZanen%40Seven.com.au%7C5514208b3d2848d8fe9f08d774d613ee%7Cb359291241554399b790752c894d2935%7C0&sdata=z%2FQDPTS5qbEkx1MB8kdz3JKvyYGToJ4%2BUbcptqfRc7I%3D&reserved=0>
>
>
> Checking the server we see no issue with the listener being down.
>
>
> grid 24040 1 0 Nov23 ? 00:03:48 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr ASMNET1LSNR_ASM -no_crs_notify -inherit
> grid 24402 1 0 Nov23 ? 00:04:58 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER -no_crs_notify -inherit
> grid 234773 1 0 Nov23 ? 00:02:16 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER_SCAN2 -no_crs_notify -inherit
> grid 234791 1 0 Nov23 ? 00:02:13 /u01/app/
> 12.2.0.1/grid/bin/tnslsnr LISTENER_SCAN3 -no_crs_notify -inherit
>
>
> This is Oracle 12.2 on Exadata Cloud at Customer solution . Anyone else
> seen this behaviour before?
>
> Oracle suggested to turn on client and server sql net tracing but I am a
> bit hesitant due to the sheer volume of tracing it will likely generate
> before I get the issue again.
>
> To me it looks like a DNS issue, but Oracle looked at this and there is no
> issues there.
>
>
>
>
> Jack van Zanen
>
>
> -------------------------
> This e-mail and any attachments may contain confidential material for the
> sole use of the intended recipient. If you are not the intended recipient,
> please be aware that any disclosure, copying, distribution or use of this
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> Thank you for your cooperation
>
>

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Received on Mon Dec 02 2019 - 01:48:51 CET