Approach when the used Live cache data area crosses the threshold

Hi,
Could any of you please let me know the detailed approach when the used Live cache data area crosses the threshold in APO system?
The approach I have as of now is :
1) When it is identified that data cache usage is nearly 100%, check for hit rate for OMS data in data cache in LC10 .Because generally hit rate for OMS data in data cache should be atleaset 99.8% and Data Cache usage should be well below 100%.
2) To monitor unsuccessful accesses to data cache choose refresh and compare value now and before unsuccessful accesses result in physical disk I/O and should generally be avoided.
3) The number of OMS data pages (OMS Data) should be much higher than the number of OMS history pages (History/Undo).A ratio of 4:1 is desirable. If OMS history has nearly the same size as OMS data, use Problem AnalysisPerformanceOMS versions to find out if named consistent views (Versions) are open for a long time. Maximum age should be 8hrs.
4)If consumption of OMS heap and data cache is large, one reason may be a long running transaction simulation that accumulates heap memory and prevents the garbage collector from releasing old object images.
5) To display existing transactional simulations in LC10,use Problem AnalysisPerformanceOMS versions and SM04 to find out user of corresponding transaction and may be required to cancel the session after contacting user if the version open for long time..
Please help me by providing additional information on the issue.
Thanks,
Varada Reddy.

Hi Mayank, sorry, one basic question - are you using some selection criteria during extraction? If yes, then try extraction without the selection criteria.
If you maintain selection based on, let's say, material, you need to use the right number of zeros as prefix (based on how you have defined the characteristic for material) otherwise no records would be selected.
Is this relevant in your case?
One more option is to try to repair teh datasource. In the planning area, go to extraction tools, select the datasource, and then choose the option of repair datasource.
If you need more info, pls let me know.
- Pawan

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Detailed approach when the used Live cache data area crosses the threshold

Hi,
Could any of you please let me know the detailed approach when the used Live cache data area crosses the threshold in APO system?
The approach I have as of now is :
1) When it is identified that data cache usage is nearly 100%, check for hit rate for OMS data in data cache in LC10 .Because generally hit rate for OMS data in data cache should be atleaset 99.8% and Data Cache usage should be well below 100%.
2) To monitor unsuccessful accesses to data cache choose refresh and compare value now and before unsuccessful accesses result in physical disk I/O and should generally be avoided.
3) The number of OMS data pages (OMS Data) should be much higher than the number of OMS history pages (History/Undo).A ratio of 4:1 is desirable. If OMS history has nearly the same size as OMS data, use Problem AnalysisPerformanceOMS versions to find out if named consistent views (Versions) are open for a long time. Maximum age should be 8hrs.
4)If consumption of OMS heap and data cache is large, one reason may be a long running transaction simulation that accumulates heap memory and prevents the garbage collector from releasing old object images.
5) To display existing transactional simulations in LC10,use Problem AnalysisPerformanceOMS versions and SM04 to find out user of corresponding transaction and may be required to cancel the session after contacting user if the version open for long time..
Please help me by providing additional information on the issue.
Thanks,
Varada Reddy.

Hi Mayank, sorry, one basic question - are you using some selection criteria during extraction? If yes, then try extraction without the selection criteria.
If you maintain selection based on, let's say, material, you need to use the right number of zeros as prefix (based on how you have defined the characteristic for material) otherwise no records would be selected.
Is this relevant in your case?
One more option is to try to repair teh datasource. In the planning area, go to extraction tools, select the datasource, and then choose the option of repair datasource.
If you need more info, pls let me know.
- Pawan

In which table is the Live cache data stored?

Hi experts,
I am new APO .Can anyone let me know in which database table will the Live cache data be stored?
Thanks in advance
regards
Ashwin.

Hello Ashwin,
the idea of the liveCache is to haev data permanently and quickly available without having to read/write from/to database. Therefore, the liveCache is NOT a physical database, it is a program in C++ that simulates a database and holds the data in the memory.
However, it does need so called liveCache-anchors which are saved on the database, and which are similar to pointers.
However, you can extract data from liveCache using BADIs or by creating a datasource on a planning area (for DP and SNP), manipulation can also be done only by BADIs or sophisticated programming (which basically uses RFCs).
I hope this answers your question.
Regards,
Klaus

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varat_pond wrote:
Anyone in Apple if you see this message
These are user to user help forums. To tell Apple you want more fonts for Thai, go here:
http://www.apple.com/feedback/ipad.html
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Hi,
         Does anyone know how to make use of adjacent data elements within the same buffer? To make my question clearly, I would like to give you an example. In my application, I set "sample to read" as 10 which means at each loop 10 data samples will be taken into a buffer. Now, what I would like to do is to do some calculations on adjacent data samples in same buffer. I tried to use "shift register" for this, but it seemed to me that it only can deal with the calculation between data from adjacent loops. In other words, it skips 9 data elements and take the 10th one for the calculation.
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                        Suksun
Attachments:
wheel_encoder_1.vi ‏98 KB

Hi Suksun,
      I hope you'll forgive me for distilling your code - mainly to understand it better. I tried to duplicate your logic exactly - which required reversing the "derivatives"-array before concatination with the current samples array. As in your code, the last velocity is being paired with the first position. If first velocity is really supposed to be paired with first position, just remove the "Reverse 1D Array" node.
cheers
Message Edited by Dynamik on 01-07-2006 03:17 AM
Message Edited by Dynamik on 01-07-2006 03:19 AM
When they give imbeciles handicap-parking, I won't have so far to walk!
Attachments:
encoder2.GIF ‏14 KB
encoder2.vi ‏102 KB

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What is the use of inverted date format

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What is the use of inverted dates. Why does SAP use them. Why not just use normal date format? If I want the latest record from the table, instead of sorting by descending, I actually have to sort by ascending because the date is stored in inverted format.

Hi,
Inverted date is a old concept which helps in soring the dates sometimes. but now ASCENDING and DESCENDING sorting is more easy and quick. Check this application help. maybe useful for you
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2. CONVERT INVERTED-DATE f1 INTO DATE f2.
Effect
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The technique of manipulating the sort sequence of dates by inverting the internal date format is now rarely used. You can sort internal tables in order of ascending or descending date values much more efficiently using the ... ASCENDING or ... DESCENDING additions to the SORT statement.
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When to use SELECT and END SELECT in the query.

hi all,
When to use SELECT and END SELECT in the query.
regads,
Venkata Suresh Penke.

Hi Suresh..
When do we need to use SELECT .. ENDSELECT
Usually we will never use SELECT .. ENDSELECT as it gives very poor performance.
But whenever we read a single Record we will use it as an alternative for SELECT SINGLE in some scenarios.
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ENDSELECT.
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ENDSELECT.
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REWARD IF HELPFUL.

Approach when the used Live cache data area crosses the threshold

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