Explain Live Cache Technology

Hi Experts,
Can anybody explain about the Live cache technology? What is advantages of this?
thanks,
SP
Message was edited by:
praisy s

Hello,
-> Please review the information at Wiki FAQ from MAXDB/liveCache forrum &
    see the answer on question "How does SAP liveCache technology relate to MaxDB?"
    at https://wiki.sdn.sap.com/wiki/display/MaxDB/FAQ#FAQ-
-> If you are the SAP customer please review the documentation at
     service.sap.com/liveCache
For SAP liveCache documentation in English < See the SAP note 767598 >:
http://help.sap.com/saphelp_nw04/helpdata/en/f2/0271f49770f0498d32844fc0283645/frameset.htm
-> Helpful information could be checked at threads
     Re: APO/BW: Understanding LiveCache
    Re: Use Of Live Cache
If you have further questions/problems with liveCache/MAXDB please post at
MaxDB/liveCache forum: SAP MaxDB
Thank you and best regards, Natalia khlopina

Similar Messages

Live cache backup

Hi Experts,
I am beginner to SCM and Live cache technology.
I have sucessfully installed SCM 5.0 and Live cache 7.6.29 on two different HP-Ux 11.23 servers.
My first requirent is to take live cache backup. But there is no tape drive connect to any of the server,
local file system assigned as backup space, accordingly I have successfully taken online backup of SCM database by modifying entries like backup_dev_type to tape in init<SID>.sap.
Know I am facing a challenge to take live cache backup on local file system , infact dont know how to take online live cache backup.
Another question is database manager gui is needed in unix environment, if yes please let me know the procedure how to configure this as In transaction lc10 upon double clicking database manager gui system generating error.
Please help to solve the above two problems.
Thanks & Regards,
Maqsood Ahmed

Hi Ahmed (no own SDN account? ).
I'd like to make a few remarks on this:
1. Backup to local filesystem w/o moving it to another location afterwards is next to useless. What happens when (when not if!), the local disk crashes? What backup can you use then?
2. You can perform liveCache Backups from DB13C/DBACockpit after you've integrated the liveCache instance (DB59).
3. If you like to administer the liveCache via DBMGUI - just install DBMGUI on your Windows Workstation and connect remotely to the liveCache. Actually this is the way how it was thought up.
For detailed information how to work with liveCache I propose you check:
The documentation [Backup/Recovery SAP Library - Database Administration in CCMS: SAP liveCache Technology|http://help.sap.com/saphelp_nw70/helpdata/EN/e9/dc1c3e46903b2ee10000000a114084/content.htm]
The SDN Content on liveCache [https://www.sdn.sap.com/irj/sdn/livecache]
The SCM Technology pages in the SAP Service Marketplace [https://service.sap.com/scm] -> SAP SCM Technology
Good luck,
Lars

What is live-cache?

Hi Experts,
Can any one explain what is live-cache and eash access in supply chain management and what is customization in SCM?
Cheers,
Aanand.

In Supply Chain Management, large volumes of data must be permanently available and changeable. For this reason, an addition has been made to the SAP DB OLTP relational database system to enable actual data structures and data flows (such as networks and relationships) to be mapped more easily and effectively. The product is called liveCache. The liveCache is object-oriented, and in contrast to SAP DB OLTP, stores its data in the main memory of the database system.
The SAP liveCache technology significantly increases the speed of the algorithmically complex, data- and runtime-intensive functions of various SAP applications, especially within SAP Supply Chain Management.
It combines the advantages of main memory-based data retention with a complete operating concept, including backup & recovery. The application functions are provided by database procedures (liveCache Applications) having an extremely fast access to all application data which can completely cached in main-memory and are organized in relational but mainly object oriented manner.
The SAP liveCache technology can be characterized by a hybrid main-memory database with intensive usage of database procedure.
For more information, please access the following links:
SAP liveCache technology
http://maxdb.sap.com/doc/7_7/f3/3edeb38ab14f9798d2a800b2c439c9/content.htm
Have a nice day!
Will
SCM Moderator

What is the significance of Live Cache in demand planning ?

Hi all,
Can anyone explain me significance of live cache in the demand planning. What are the issues will turn up for live cache if it is not properly maintained?
Thanks
Pooja

Hi Pooja,
SAP has come up with Live cache concept for storage and most important, quick and efficient processing of transactional data. Its a layer between data base and GUI and even the search methods and storage space has been optimized due to its structure. In DP it is used for storage of time series data whereas in SNP it can store both time series and order series data.
Regarding your second query, it is recommended to have Live cache consistency on a periodic basis for synchrinising data between LC and database tables. You can face many issues due to LC inconsistency as incorrect time series generation, Transactional data discrepancy, COM routine errors during background processing etc.
Let me know if it helps
Regards
Gaurav

Data storage in Live Cache

Hi,
Can some1 explain me how the SNP data is stored in the live cache.
I know it's by series of order. But tell me is there any mapping involved in it?
Thanks,
Siva.

Order series data is used by both SNP and PPDS.
While I do not know the exact way data is stored in liveCache the following helps me to explain and understand.
Each record in liveCache for Order Series data is stored as
Location Product combination-ATP Category-Quantity-Time Stamp.
Unlike Timeseries data CVC is replaced by a location product combination only, keyfigure is replaced by ATP Category (each kind of Order elements has its own ATP Category) and Time Bucket is replaced by actual Time Stamp (in UTC ddmmyyyyhhmmss format).
The mapping is essentially with ATP Category which maps to corresponding MRP elements in ECC or R/3.
In the SNP Planning Area for each keyfigure the Category Group defines the grouping of ATP Categories for which orderseries data will be displayed in that particular keyfigure.
Hope this helps.
Thanks,
Somnath

Data movement from R/3 DB to APO DB and to Live cache

Dear APO Experts,
I have few questions on live cache and how it works, I understand that Live cache is memory resident database. below are my questions.
1) What sought of data move from R/3 DB to APO DB and then to Live cache DB
2) When data moves from APO DB to Live cache, till how much duration that data stays in live cache
3) And how does data gets pulled in to live cache from APO DB
4) Why do we require live cache logs while data never gets commited to hard disk
5) Do we ever add a datafile to Live cache DB
any info that you provide on this will be really helpfull to me
Thanks,
Chetan

Hello Chetan,
As you know, itu2019s MAXDB/liveCache forum.
What is the version of your system?
The is documentation available at:
   SAP liveCache technology
< Please review document u201CWhat is SAP liveCache technology?u201D >
Sap documents at service.sap.com/scm -> Technology:
u201CliveCache overviewu201D and u201CIntegration overviewu201D
For SAP liveCache documentation also see the SAP note 767598.
Go to SAP link Best Practices for Solution Management: mySAP SCM at   SAP liveCache technology ...
And Review the document u201CManage APO Core Interface in SAP APO (3.x) / mySAP SCM (4.x/ 5.0)u201D
1. As you saw in the reference documents the data transferred from the connected R/3 system to APO.
And the transactional data could be uploaded to the liveCache, if you downloaded them
to the APO database cluster tables first. This procedure steps are running during the
system upgrade < for example, from SCM 5.0 to SCM 7.0 ) u2013 report /SAPAPO/OM_LC_UPGRADE_70 steps. Or you want to migrate the
liveCache to another operating system or convert your system to Unicode,
and therefore you want to back up the liveCache data first so that you
can reload it into the liveCache afterwards - SAP Note No. 632357.
2. Could you collaborate more on this sentence. Could you give examples?
3. u201CAnd how does data gets pulled in to live cache from APO DBu201D
    The data are not pulled from the APO DB to liveCache.
     When you changed the APO data on the system the LCA procedures have been called from ABAP. The objects stored in the class containers in liveCache can be accessed and manipulated only via LCA routines. The registration of the LCA routines is done automatically when the liveCache is started by the LC10. The LCA procedures in the LiveCache are written in C++
and shipped to the customers as binary LCA libraries(LCA build) together with the LiveCache.
< See more details in SAP Note No. 824489 or 1278897 as of SCM 7.0 >
4. See the SAP notes:
               869267     FAQ: SAP MaxDB LOG area
             1377148     FAQ: SAP MaxDB backup/recovery
5. You could run the quicksizer & estimate how much data you are planning to have in liveCache.
     Also the amount of data could be increased by the creation of the new data in APO by users
     Or another reason u2026
     In general you will add the datavolume to solve or prevent the DB_FULL issue,
     See u201C17. What do I do if the data area is full? u201C in SAP note 846890.
Thank you and best regards, Natalia Khlopina

Live cache lock handler not available

Hi we are frequently getting this error Live cache lock handler not available and this causes our process chains to fail.
Can anyone please explain in details what this error refers to and direct to any good links for error resolution.

Hello,
1. As SAP customer, you could create the SAP message to the component BC-DB-LCA and get SAP support.
2. If you set the flag 'activate livecache lock' in tcode /SAPAPO/MSDP_ADMIN for your planning area on SCM system, please run the connection test for the LEA connection in /ndb59 to check the LEA connection settings.
The liveCache installation guide has additional information about LEA connection.
Regards, Natalia Khlopina

Live Cache config prob!!!!!!

Dear All,
I have just installed IDES of SCM 5.0 and scheduled and released the default jobs from sm36. But from sm37 I can see that the jobs are getting cancelled .
1)" Connection to LiveCache Failed " .
2)" LiveCache Lock Server not Accessible " .
I have installed ABAP + JAVA and logged in client 001.
Please advice ........
Regards,
Souren

Hi Natalia,
Thanks for the reply.
Ours is win2k3 32 bit system where we have installed :
(1) Oracle 10.2 &
(2) SCM 5.0 server (Central System Installation).
During Installation, SAPinst asked for Live cache related details (eg, Live Cache ID - we have given LC1, Control user's Pwd etc) along with the installation DVD for the same - where we have given the DVD 51032259_11 (NW 2004s SR2 liveCache 7.6.0 Windows Server on IA32 32bit).
The installation completed successfully. Our SCM system id is SR3.
**Does this mean that Live Cache Server got installed ??
After the above installation, we have referred the "Installation - SAP liveCache Technology on Win - NW 7.0 SR2" and tried to do the post installation steps (Assuming that Live cache got installed )
We created the RFC user with all the authorizations as described in the SAP note for the same.
During the post installation step :
dbmcli d <SID> -u <controluser>,<password> db_offline,
we got the following error:
ERROR! Connection failed to node <LOCAL> for database <SID>:
Database instance not found.
We tried with both SR3 & LC1 as SID but the result is same.
Further, we tried the next post installation step using LC10.
After Integrating LCA,LDA & LEA, when we tried to "monitor" the Live Cache (by clicking the Live Cache: Monitoring button), we got the following error:
DBMRFC Function : DBM_CONNECT
Error :DBM Error
Return Code : -4
Error Message database instance not found
How should we proceed now??
Thanks & Regards,
Souren

Multiple users uploading data to Live cache

Sorry posted in wrong thread. Please find this thread in Master data and general.
Closing this one
Hello ,
Does APO has the capability to handle flat file uploads simultaneously to live cache by 5 different users or does it throw out a message asking other users to wait until one upload is finished.
We have a situation where users upload the flat files and based on these files the CVC creation process kicks off (If there are any new combinations). But every time more than one user tries to upload the file the system would nt allow other users to upload.
Any help or input is highly appreciated.
Thank you,
Sai
Edited by: st.sapscm on Jan 11, 2012 12:01 PM

Thanks a lot of the prompt reply.
Let me be more specific. The users upload sales data to APO (APO Info cube) in Work week versions. So the planners usually don't upload same CVCs but sometime they do upload all at once, say once every week or month.
So when you say "Object" say the object in my case is APO BW infocube. The second part of your response compliments the idea that it might not be possible to do a simultaneous upload. Correct me if i am wrong. I am a little confused with the very first statement ("Yes it is possible..." and the second part of you response about the locking.
Can you please explain what would happen in each case when the recipient is 1. Info cube 2. Planning area
Thanks a lot.
Sai

Live Cache R/3 or Non-R/3 DB?

Hi,
Is Live Cache a R/3 or Non-R/3 database?
This might be a very basic question but still I like to know the answer for this.
Thanks,
Siva.

Hello Siva,
The SAP liveCache technology is an object-based enhancement of the MaxDB database system.
You can use SAP liveCache technology either as a normal relational database system, or as a main memory-based special database system.
You could find more documentation/information at SAP links:
service.sap.com/livecache
Service.sap.com/scm -> SAP SCM Technology
< "Architecture overview" & "liveCache overview" >
Within SAP APO 3., SCM 4., SCM 5.* the SAP APO functionality requires SAP liveCache Technology.
In the document "liveCache overview" you will see which SAP Application
Components using SAP liveCache Technology
Thank you and best regards, Natalia Khlopina

LC-10 - Live cache

Hi Guys,
IF i stopped live cache in LC-10 , what happen to the system , specially to the dynamic data's in live cache , how will it impact APO system and R/3 system
if i want to bring back to original status of live cache what i have to do
Right now i stopped and started again live cache, then i went to apo system and opened product view of particular product system says live cache not available
but the live cache i started again
Please give some feed back on this issue
Thanks
Raj

Hi
Thanks for kind guidelines
here is my exact problem, currently two system APO and R/3 is running smoothly with CIF
Accidentally i stopped LiveCache and started again
but when i go to apo Product view , i entered the product and location to view those existing planned order and sales order
But the system says that LiveCache not available
Please explain what is the reason for it , i need to activate all the integration models in R/3 again
please some one help me in this regard
Thanks in advance
Raj

Live-cache for IDES

Hi Gurus,
I had tested IDES system and it doesnt have live cache , can i use the system for further.Please conform me as i requested for it that it doesnt work.
Thanks in advance
regards,
Kumar

Kumar.
I am only reinstating what has already been said. You cannot use your system without a Live cache installation. Please get in touch with your BASIS administrator to get it configured and activated.
For further read use:
SAP liveCache technology
Abhi

LIVE CACHE MANAGEMENT

Hi,
Could you please send detailsl and material documents regarding LIVE CACHE MANAGEMENT .
I am in very urgent need of material.
Thanks and regards,
shyla kumar
Message was edited by:
        shyla kumar

Hello Shyla ,
If you are looking for details and material documents regarding SAP liveCache
Database ::
-> For SAP liveCache documentation in English < See the SAP note 767598 >:
http://help.sap.com/saphelp_nw04/helpdata/en/f2/0271f49770f0498d32844fc0283645/frameset.htm
-> Please review the SAP notes:
          820824     FAQ: MaxDB/liveCache technology
          767598 Available documentation
-> Please review the documentation at
     service.sap.com/scm -> mySAP SCM Technology
     service.sap.com/liveCache
it is available for SAP customers.
-> Please review additional information at
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/maxdb/main&
-> MaxDB Support Guide -> liveCache
Thank you and best regards, Natalia Khlopina

Live Cache Crashed

Hello Guru's,
My Production system Live cache has been crashed. I am trying to restore the last backup which was taken yesterday night 8:00pm. I am able to restore the Live Cache however unable to restore the logs to recover PIT, as it is complaining about log sequence. I am not sure about finding the sequence number it is asking for.
Crash happened today morning 7:00am. Backup restored last night 8pm and trying to do point in time recovery. Backup has been restored and trying to apply logs.
Note;- log backup is for every 2 hours, so after the complete backup last night, we have log backup's for every 2 hours and trying to apply the same.
Kindly suggest what can be done..
Thanks,
Sravanthi.

Hello,
1.
You have questions how to solve the liveCache issues on the PROD system
=>
As already recommended Lars, please open the SAP message to the component BC-DB-LVC to get SAP support.
It will be helpful to know the SCM/APO version, liveCache version and more details about the liveCache crash.
2.
In case you had the liveCache crash due the hardware problems, and the data or log volumes or liveCache configuration files are corrupted
=>
solve the hardware issues first or use another server
Follow the SAP note to create the liveCache instance:
    457425     Homogenous liveCache copy using backup/restore
   You need to create/initialize the liveCache instance for restore or run the Restore with initialization, restore the successful databackup, then leave the liveCache in admin status and continue the restore of the incremental databackup/logbackups in sequence if needed.
*More information could be found in the SAP notes:
1377148     FAQ: SAP MaxDB backup/recovery
869267                     FAQ: SAP MaxDB LOG area
820824          FAQ: SAP MaxDB/liveCache technology
Thank you and best regards, Natalia Khlopina

Live cache was down

Hi All,
The live cache instance on my SCM was down yesterday.
However it was got up again thro' LC10.I'm trying to find the reason for it being down.
Can someone please suggest how can I get this information.
I can see the following in knldig around the sametime.Is it becuase of the autolog option.
COMMUNIC Requestor rejecting (server state 21)
    13         3 RunTime State changed from STARTING to ADMIN
======================================= end of startup part ====================
    13     11570 startup complete
   24        31 SrvTasks Permanently reserved 202 servertasks for 'Backup / Restore'.
   24        31 SrvTasks Permanently reserved 2 servertasks for 'Backup / Restore'.
    24        31 SrvTasks Permanently reserved 1 servertasks for 'Savepoint'.
/sapdb/XYZ/saplog2/DISKL002' successfull
9Admin    Kernel state: 'REDO LOG' finished
715     54000 OBJECT   /sapdb/XYZ/db/lib/liboms
   715     51261 TRIGGER system trigger started ...
   715     51261 TRIGGER system trigger completed
   715         3 RunTime State changed from ADMIN to ONLINE.
Thanks and Regards,Prasanna

Hi,
it seems quite strange that you do not see any errors within knldiag.err that might explain why your liveCache instance was down at the time and a restart was needed. If there was no crash or anything remotely similar, somebody triggered liveCache to go down manually? You might want to check dbm.prt, dbm.utl and lcinit.log / lcinit.his to see whether this was the case.
Regarding the XServer, you should have a XServer protocol file with the /sapdb/data/wrk directory.
Regards,
Roland
P.S.: which exact liveCache version (incl. Buildnr.) and OS are you using?

Explain Live Cache Technology

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