Log_archive_dest_2: SYNC or ASYNC

All,
I have the following setup:
Physical standby of a primary, with a delay configured of 23 hours (5 minutes in my test setup).
With a delay, should my log_archive_dest_2 parameter contain SYNC or ASYNC?
I believe it has to be ASYNC, because I want to avoid my prod being blocked if network is down.
alter system set log_archive_dest_2='SERVICE=STAN LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=STAN reopen=60 delay=5' scope=both sid='*';
Regards

Specifies that network I/O is to be done synchronously (SYNC) or asynchronously (ASYNC) when archival is performed using the log writer process (LGWR).
Note:
When the primary database is in maximum protection mode or maximum availability mode, destinations archiving to standby redo log files and using the log writer process are automatically placed in SYNC mode.
had better refer the link:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/log_arch_dest_param.htm

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Naming sync and async operation

Hi there,
Does somebody know what is the rule for naming the synchronous version of an asynchronous operation (or vice verse)? Also, is the implementation pattern for the Create/Update/Delete/Sync EBO based EBS operations always supposed to be asynchronous request-response (while synchronous for Query/QueryList)?
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Regards,
/Miko

839396 wrote:
Dear Friends,
In 11g databgurad ,
I planned to used 2 physical standy once in the same LAN and another in the DR site
I need to have SYNC between primary and Standby 1 which is in same LAN
I need to have ASYNC between primary an standy 2 which is in DR site
Is it possible , if so how do i achieve this?
Because i believe SYNC and ASYNC will be decided by oracle internally based on the Protection mode we choose so in that case
we can't have mix up (SYNC and ASYNC) for standby databases?
Regards,
DBI think John already mentioned how to do, let me derive more .
SQL> alter system set log_archive_dest_2='SERVICE=same_lan SYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=<db_unique_name>'
SQL> alter system set log_archive_dest_3='SERVICE=DR ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=<db_unique_name>'
>
     839396
     Newbie
Handle:      839396
Status Level:      Newbie
Registered:      Feb 23, 2011
Total Posts:      14
Total Questions:      8 (8 unresolved)
>
why all the questions are unanswered? Please close the threads and keep the forum clean. https://forums.oracle.com/forums/ann.jspa?annID=718

Sync or ASync for a Data Warehouse environment?

We have a 7 TB DW environment that we're using High Availability on. Almost all of the data is bulk loaded nightly/ weekly. We've been running this in Sync-commit mode, but lately the Transaction Log in our Primary DB has grown to > 1/2 TB waiting on
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Would this scenario be mitigated if we were using ASync-commit mode? Would the TLog, no longer waiting for the Secondary to synchronize, be able to shrink as it normally would (of course considering TLog backups, etc.)?
TIA, ChrisRDBA

We have a 7 TB DW environment that we're using High Availability on. Almost all of the data is bulk loaded nightly/ weekly. We've been running this in Sync-commit mode, but lately the Transaction Log in our Primary DB has grown to > 1/2 TB waiting on
the bulk loads to be committed on the Secondary server.
Would this scenario be mitigated if we were using ASync-commit mode? Would the TLog, no longer waiting for the Secondary to synchronize, be able to shrink as it normally would (of course considering TLog backups, etc.)?
Hi,
Whether you use Sync or Async mirroring( I guess you are talking about mirroring) logs generated by transaction would be same. IMO problem here is logs being generated. Of course in sync mirroring transaction will wait for commit on mirror to commit
it on principal so in sync commit would be delayed there would not be affect to transaction log.
From what you gave I suggest you to break bulk load operation in more quantised batches. I mean to say decrease amount of data being loaded followed by (If possible) more transaction log backups and in this case Async would help to speed up commit but remember
chances of Data loss in case of disaster will increase in Async Mirroring plus you need to have Enterprise edition to take benefit of Async mirroring.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it.
My TechNet Wiki Articles

Statistics of Sync and Async messages in PI

Hi,
How can we count no of Sync and Async messages that were processed(sucessful or unsucessful) in PI.
Does the worbench has any table or Report that will give me the statistics.
Request some pointers on the same.
Thanks ,
Bhanu.

Hi,
Yes, such a report is available in RWB under Performance Monitoring. Simply choose the required time period, and use Display Options to add the Processing Mode (that will say: sync or async). You can also use Performance Monitoring to get more details about these messages.
Hope this helps,
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Proxy to JMS Scenario: switch from sync to async proxy,does it makes sense?

Hi @all,
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> But in case of switching, what is the best way?
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I don't think you need 2 scenarios for this. Just one is enough with different RDs.
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Sync-to-Async process

Hi,
I'm trying to call an asynchronous process from a synchronous one following the Sync-to-Async instructions available in the documentation ("Building Synchronous and Asynchronous business processes").
I can generate the Sync-to-Async WSDL file without problems but when I try to build the control from the WSDL, the callback method is never generated (the callback method is defined in the WSDL) and get this warning:
"WARNING: processes/sync/SincronWorkerSyncContract.wsdl Line 0, Col 0: Operation 'response' was not added to the CTRL file."
Any ideas of what I'm doing wrong?
Thanks!!

Raghavendra,
You should check the syncmax wait time parameter on the server. It is this parameter that causes synchronous interfaces to time out .
- santosh

Can processes be both sync and async

Hi,
When creating a BPEL process in JDeveloper, there are two pre-defined templates for synchronous or asynchronous processes. As such, I've been viewing a process as being either synchronous or asynchronous.
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Some thoughts on that:
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All,
What is the difference between sync and async web services?
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Thanks

SRAVZ wrote:
What is the difference between sync and async web services?from a webservice protocal perspective there is no difference. you still make a request and get a response. the difference is in what the initial response contains. in a synchronous call, the initial response will contain the final result. in an asynchronous call, the initial response will not contain the final result, but may contain some sort of "ticket" which can be used in a subsequent call to get the final result. generally, the client will need to poll the webservice until the final result is available.
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Edited by: jtahlborn on Dec 2, 2012 9:22 AM

SYNC or ASYNC

Hi,
When the network to the standby is lost with SYNC or ASYNC, where is the information queued and how is it retransmitted once the network has been re-established?

about this ,Larry Carpenter's book "Oracle Data Guard 11g Handbook" has a best description , i post it here :
Automatic Gap Resolution
A log file gap occurs whenever a primary database continues to commit transactions while the LNS process has ceased transmitting redo to the standby database.This can occur whenever the network or the standby database is down,depending on how you have chosen to implement your Data Guard configuration.While in this state,the primary database LGWR process continues writing to the current ORL,fills it,and then swithes to a new ORL while an archive(ARCH) process archives the completed ORL locally.This cycle can repeat itself many times over on a busy system before the connection between the primary and standby is restored,creating a large log file gap.
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Design question - 1 source (sync) -- 2 receivers (sync and async)

Hi All,
What are the options available to design following scenario:
Message (material update) sent to XI from 3rd party system, XI will update material synchronous calling BAPI in SAP, response will be sent back to 3rd party. The same message (material update) needs to be updated in SQL DB asynchronously.
Do we need to use BPM for the above scenario (SystemA <> XI <> SAP and same message from SystemA -->XI --> SQL DB)???
If I need to use BPM What are the steps to be used in BPM??
Can we do this without BPM?? What is the procedure??
Thx
N@v!n

Ahmad,
I think that for 1:n scenarios, if you have synchronous receiver interfaces, you'll need BPM for that. That happens because XI wont be able to decide on which receiver response message will be actually mapped back to sender response. However, Im not sure it wont work for 1:2 scenario, if you have 1 sync and 1 async receiver interfaces. Theoretically, it could work. You'll have to test it in order to be sure. If you get "TOO_MANY_RECEIVERS" error then it is like I said, it wont process 1:n with sync interfaces.
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Regards,
Henrique.

Async to sync to async across different SWCV using BPM

I have inherited some scenarios and incomplete config... the more i dig the more i find....
i think I have a SAP proxy -> web (sync) -> mail adapter scenario.
i have created the SWCV for the web, the Proxy is using SAP Standard ERECRUIT objects (aysnc) and i guess i need to use a BPM to link the async -> sync -> async.
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the service interface is not abstract... i cannot create an abstract version of the SI in my namespace and use it... as it can only access the DT and External Definitions within the SWCV...
would it be best to map the SAP structure to a custom copy of the SAP Structure within my namespace then proceed with the BPM?
what would be best practice for this??? has anyone else come across a similar scenario? is BPM the answer???
i have been looking at this blog and it looks the way to go...
/people/sriram.vasudevan3/blog/2005/01/11/demonstrating-use-of-synchronous-asynchronous-bridge-to-integrate-synchronous-and-asynchronous-systems-using-ccbpm-in-sap-xi
i am using rules to determine where the message should be routed too in the receiver, but i get the feeling this will have be implemented for all messages once i get the first working... the process will probably be the same, jsut the final Web destination will be different....

for the BPM, you can only access service interface in the same SWCV as of the BPM.

Sync and async bpel process

Hi,
I was reading about the synchronous and asynchronous process in the forum, I have also some similar problem.
some of my questions are:
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As the above is true, I have created a asynchronous BPEL process, now I want the reply back from asynchronous, is this is possible? even I found that when I invoke the partner link of asynchronous BPEL process it doesn't ask for the output variable. SO if any process going to take longer time and need response from that, whats the solution.
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Hi James,
Thanks, yes you are correct that receive is required for the response from async process.
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Doubt about Sync and Async process

hi experts i have one small doubt
if we r having the scenario like file to rfc
iam passing the input parameter like material number through file adapter
and then i want to get the material details response from rfc sap r/3 to file system
this is the scenario.
now here which is the synchronous processs
and which is the asynchronous process
please let me know
clear my doubt with explanation please......
thanks
giri

Hi Sesha,
For information on sync/async please refer:
<a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/43/65d4dab39b0398e10000000a1553f6/frameset.htm">http://help.sap.com/saphelp_nw2004s/helpdata/en/43/65d4dab39b0398e10000000a1553f6/frameset.htm</a>
<a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/83/d2a84028c9e469e10000000a1550b0/frameset.htm">http://help.sap.com/saphelp_nw2004s/helpdata/en/83/d2a84028c9e469e10000000a1550b0/frameset.htm</a>
Regards,
Subhasha ranjan
Message was edited by:
Subhasha Ranjan

Facing problem when using SYNC and ASYNC bridge in ID

Hi all,
In BPM i am using SYNC/ASYNC bridge for that Outbound Interface and BPM Sync Interface has the same structure is it mapping necessary for that intercaces.
In interface determination it is showing error duplicate interfaces in ID test configuration , when i loading the Interface mapping for the same.
In the Receiver determination i am sending the message based on the conditions to the particular receives through different receivers Business Systems from the Sync interface showing error.
Give me solution how should i do the Interface determination and receiver determination.
Please help me any one .
Thanks in advance,
Manohar.
Edited by: Manohar S on Feb 28, 2008 9:50 AM

Sorry for delay.
Tough question.
Oracle® Database High Availability Best Practices 11g Release 2 (11.2) E10803-01 August 2011
Under "5.1.8 Set LOG_BUFFER Initialization Parameter to a Minimum 8 MB"
States :
"If you are using Oracle Data Guard with asynchronous redo transport, you may need to increase the value of the
LOG_BUFFER parameter to avoid disk I/Os to online redo logs."
Nothing about "Synchronous".
I agree with you on Oracle Support Note 951152.1, its vague.
Additional links on the subject
This also seems to imply :
http://joordsblog.vandenoord.eu/2010/08/data-guard-optimizing-async-redo.html
So does this ( With ASYNC, increase log buffer size if necessary )
http://www.oracle.com/technetwork/database/features/availability/316925-175283.pdf
This one has a very nice Synchronous and Asynchronous compare.
http://www.datadisk.co.uk/html_docs/oracle_dg/architecture.htm
New Zealand, Someday I may have to travel there.
Best Regards
mseberg

Idoc (async) - soap (sync) - file (async)

Hi.
I have a flow from idoc (async) to webservice (soap sync) and I want the response from soap to be written in file (async).
I want to do this without BPM and I have read some posts about using modules RequestResponseBean and ResponseOnewayBean.
Can someone help me with this step by step.
I have in ESR a OM that is async because of the outbound Idoc. Do I need a sync OM for the soap call and another async OM for the response to the file.
Where do I need to put the modules? In the SOAP receiver?
I know there are some threads that cover some of this but I couldn't find any that cover the whole of my issue step by step.
Regards,
Hjortur

Yes doing async to sync is possible without bpm. YOu already got the design solution.
>Where do I need to put the modules? In the SOAP receiver?
Sender Channel. In your case you might not need channel for idoc but for this configuration you might need to create one. That is my guess.
In the module section sequence as follows
1) AF_Modules/RequestResponseBean   Type: Local Enterprise Bean    Module key   1
2) CallSapAdapter                Type Local Enterprise Bean    Module Key 2
3) AF_Modules/ResponseOnewayBean     Type Local Enterprise Bean Module Key   3
Plus follow the link given by shabarish as reference.

Log_archive_dest_2: SYNC or ASYNC

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