Home -> Mailing Lists -> Oracle-L -> Re: resume duplication from active for standby after network issue

Re: resume duplication from active for standby after network issue

From: Leng <lkaing_at_gmail.com>
Date: Sat, 12 Jan 2019 10:36:51 +1100
Message-Id: <FBC4436B-7AB5-49F5-835E-91ED53286A3C_at_gmail.com> 






If network between your source and destination is an issue then you should consider doing a targetless backup based duplicate from backup destination. This would eliminate all network transfers during the duplicate. 



To achieve this:


Take a backup of the source


Transfer the backup to your destination 
Perform a targetless duplicate from the backup location



There are many examples on the oracle support portal and google for this.



Cheers,


Leng



> On 12 Jan 2019, at 12:53 am, Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

> 

> Increasing the OS TCP timeout and/or retries setting might help as it would raise the tolerance towards network issues.


> 

> By the way, you can use the simple script described in https://nenadnoveljic.com/blog/testing-network-connectivity/ to get an idea about the TCP latency over time. Basically, the script measures the time needed to open and close the TCP socket.

> 

> But I strongly recommend to invest a little bit more time in understanding the "network problem". I deliberately used quotes, because what looks like a network problem might easily be a consequence of, for example, CPU starvation or an OS bug.

> 

> Nenad

> 

> https://nenadnoveljic.com/blog

> 

> 

> 

> -----Original Message-----

> From: grzegorzof_at_interia.pl <grzegorzof_at_interia.pl>

> Sent: Freitag, 11. Januar 2019 13:58

> To: Noveljic Nenad <nenad.noveljic_at_vontobel.com>

> Cc: oracle-l_at_freelists.org

> Subject: RE: resume duplication from active for standby after network issue

> 

> It usually ends like this :

> RMAN-00571: ===========================================================


> RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============


> RMAN-00571: ===========================================================


> RMAN-00601: fatal error in recovery manager

> RMAN-03004: fatal error during execution of command

> ORA-12170: TNS:Connect timeout occurred

> ORACLE error from target database:

> ORA-03113: end-of-file on communication channel

> 

> G

> 

> 

> 

>> Depending on what "unstable network" is, increasing the OS TCP timeout and/or retries setting might be considered as a workaround.
>> 
>> Nenad Noveljic
>> 


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Received on Sat Jan 12 2019 - 00:36:51 CET












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