Problems with real-time extraction from generic datasource.

Hello,
I have a real-time extraction from generic datasoruce with numeric field as a delta pointer. I have created an initilization infopackage, delta IP and real-time IP, real-time data transfer process, real-time deamon. The problem is that real-time extraction does not see delta updates. Deamon creates requests in PSA every minute, but there are all empty. When i delete the deamon and shedule not real-time delta infopackage, it loads delta records correctly. Version of BI - 7.0 SP 18.
The second question: a cannot stop real-time deamon. I stop it in RSRDA, but when i try to shedule standart IP, i get an error, that deamon is still running. So i have to delete it and recreate.
And the 3rd question, theoretical. What real-time extraction is necessary for? As i understand, i can create a process chain that will be sheduled every 1 (5, 10, ...) minute. What are advantages of real-time extraction rather such variant?
Thanks.

Hi,
1.Note 1113610 - P17:SDL:PC:RDA:Daemon runs: Do not start delta/init IPackage
Summary
Symptom
When a daemon runs or is scheduled, you may not start a 'normal' delta/init InfoPackage.
Other terms
RDA, real-time data acquisition, daemon, InfoPackage, scheduler
Reason and Prerequisites
This problem is caused by a program error.
Solution
SAP NetWeaver 7.0 BI
Import Support Package 17 for SAP NetWeaver 7.0 BI (BI Patch 17 or SAPKW70017) into your BI system. The Support Package is available when Note 1106569 "SAPBINews BI7.0 Support Package 17", which describes this Support Package in more detail, is released for customers.
**********you can apply the correction instructions provided in the note
2.i refered closing of the request in the target i.e DSO not psa.
3. Note 1000157 - RDA daemon does not get data from delta queue
Summary
Symptom
You use Real-time Data Acquisition (RDA) to load data from an SAP source system. After several hours or days, the system no longer reads the data from the delta queue. In the RDA monitor, you can see that the InfoPackage has been executed, however the data transfer process (DTP) has not been executed for a long time. In transaction RSA7 in the source system, you can see that there is already data in the delta queue.
Cheers,
swapna.G

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I created ds with Generic Delta : Delta-Specific Fields pointed time stamp and in settings checked Real-time Enabl . After that created modeling in BW , made initial update like discribed in SAP Documentation , created one more infopackage with adapter :Real-time extraction from sap , assigned infopackage and dtp to daemon and started job of daemon .
Request stay yellow all of time and dosn't bring no one records of changes in R3 . Anybody know what is the couse for that? Maby I forgot to check something anywhere or star trigger anyone!?

The following setup working fine for me
In R/3 for Generic Delta ---
        Filed Name - AEDTM
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        Lower Limit - 2
        Real_Time enabl - Check Box - 'ON'
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    Now create another Infopack (real_time Enable & ) and create real-time DTP.
In RSRDA
    Create a Daemon
    Assign InfoPack & DTP to Daemon.
    Now start daemon...Here the message says something like 'one of the request is not activated'.
    Now, select DTP under Daemon --> use menu Edit --> Repair Chain --> Execute
    (If repair chain is not yet there then Daemon --> use menu Edit --> Repair Chain --> Generate and
     once this is done execute the using the above path). Once the chain finishs
    Now start Daemon and refresh.
    Now u can see, an open request (yellow) under infopackage.
    As soon as the new records gets load into PSA, then an open request starts under DTP.
    (Note: If no new data available in PSA, no open request starts under DTP)
Also note that, RDA requests (in PSA & DSO Manage) should always be in yellow, that means Real-Time Aquisition is working.

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I tried to built a RDA data flow according to the SAP-Help and this blog (/people/kamaljeet.kharbanda/blog/2006/11/13/real-time-data-acquisition-bi2004s), but I ran into a problem. Everything seems to be fine, but even though the daemon is running no new data is added to the DSO. I'll explain in detail what steps I took and hope someone can pinpoint my error(s).
System is BW4 on SPS 17. My datasource as well as my DSObject are in the same system
1.) Created a transparent table with a timestamp-field for generic delta as a local object.
2.) Created a generic datasource from view/table (used the above table), marked it as realtime-enabled and used timestamp as delta-specific field.
3.) Replicated the metadata for my datasource and activated it.
4.) Created a Data Storage Object with infoobjects corresponding to the table fields
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7.) Created an InfoPackage for Delta-Initial Load. Update mode: Initialize Delta Process -> Initialization with Data Transfer.
8.) Then I changed my DTP (step 6) to "normal DTP" and executed it. Then activated the data in the DSO. The datasets from the table (which i filled with an ABAP-program) were successfully loaded and activated. So now my DSO contains 5 datasets.
9.) Changed the DTP back to "realtime DTP"
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11.) Created a daemon, assigned the IP for RDA and the DTP to the daemon and started it up.
12.) Executed my ABAP program to added 3 datasets to the table which is used as a datasource.
So now in my source table there are 8 datasets, but the daemon won't load them. In my RDA-Monitor (trx rsrda) it shows my daemon, the assigned IP and the assigned DTP (status green). Under the IP there's one yellow request (that should be right according to the help), but unlike the picture in the blog (link see above) there's no request under the DTP.
Job overview (sm37) shows an active batch job and some jobs that are ready (every 10minutes a new batch starts and the old one is closed). the job log shows, that the daemon runs, but loads no data...
i think it might be a problem with the delta extraction somewhere, because the intial load works fine and there are no errors anywhere.
Edit: perhaps my settings in the data source unter tab: extraction are wrong?
Delta process: AIE After Images By Extractor (can't change that)
Direct Access: Allowd
real Time: Real-Time DA Supported
Adapter: realtime data extraction (also tried Access to SAP Data through Service API which seems senseless)
Data Format: Fixed Lenght
Anyone can explain what those fileds mean and which one i should use?
Edited by: Christoph Jender on Apr 10, 2008 2:48 PM
Edited by: Christoph Jender on Apr 10, 2008 3:33 PM

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The lower safety interval actually helps not to have the data loss but again it is not 100% full proof method. It's correctness depends on how you set the safety interval.
Not necessaraly but sometime it may happen that any record is going beyond safety interval and still failing to get extracted in delta.
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[Safty intervel in generic Extraction;
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