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

Similar Messages

What is Live Cache in APO

Hi Gurus,
I am working on APO datasource in SNP,
How do the live cache filled up? I have built a cube top of a custom datasource (9AZSNP), everything works fine and i want to know what is behind the live cache, is it directly a user entry planning version template or any underlying tables.
Please advise.
Thanks. Gowda

Hi,
The datasource will use only planning version template, and data will trabsfer from Planning area to BW. Regarding Liveche you talk to APO guys,,, it will store data and it is dynamic..
Check
Feeding Cube from Live Cache
Re: Livecache for SCM/APO
Re: what is the use of Livecache,why can't we go with relation databases...
Thanks
Reddy
Edited by: Surendra Reddy on Mar 7, 2009 5:39 AM

What is Live Cache Anchor

Hi ,
Some times we see errors like "No Live Cache Anchor Found". Can somebody tell me in detail that what is a live cache anchor and why this inconsistency occurs. Is there a link containing detailed documentation?
Best Regards,
Chandan Dubey

Dear Chandan,
This error message "No Live Cache Anchor Found" states that for one or even for several characteristics combinations (see Transaction /SAPAPO/MC62) a so-called LiveCache anchor does not exist.In this case, a LiveCache anchor is a pointer to one or several time series in the LiveCache.
There is one LiveCache anchor per planning area, characteristics combination (planning object) and model (model belonging to the planning version, see transaction /SAPAPO/MVM). If for one planning area, time series objects were created for several versions with different models, that means several LiveCache anchors exist for the same planning area and for the same characteristics combination.If you created time series objects for several versions of the same model, that means one LiveCache anchor
points to several time series in the LiveCache.
If there is no LiveCache anchor for a planning area, a model and a characteristics combination, this also means that no respective time series exists in the LiveCache and thus, this characteristics combination cannot be used for the planning with this planning area for all versions of the model.If this state occured for a certain characteristics combination, the above-mentioned error message occurs if either exactly this characteristics combination is selected or if a selection contains this characteristics combination.
Possible causes and solutions:
- Time series objects have not yet been created for the selected version.
Solution: Create time series objects (see documentation)
- You are using a planning session with version assignment.For the version that was acutally selected, the time series objects were created, however, this is not the case for the assigned version.
Solution:Create time series objects for the assigned version.
- New characteristics combinations were created without the 'Create time series ob' option (see Transaction /SAPAPO/MC62).
Solution:Execute the report /SAPAPO/TS_LCM_PLOB_DELTA_SYNC for the basis planning object structure of the planning area.This will create the corresponding LiveCache anchors and LiveCache time series for all planning areas that used these basis planning object structure and for all versions of these planning areas for which time series objects already exist.
If none of these possible solutions is successful, you can use report /SAPAPO/TS_LCM_CONS_CHECK to determine and correct the inconsistencies for a planning area ('Repair' option).
I hope this helps.
Regards,
Tibor

Live Cache Locks

Dear Friends,
What does Live Cache Lock mean? How do we use this and what is it for? How to manage in APO? Can anyone let me know answers pls. Thanks in advance.
Regards
Bala

Hi Bala,
When you create, change and delete orders, rows in relational tables are changed or deleted in the liveCache. The corresponding records stay locked until the end of the transaction. The maximum number of locks on relational records is determined with parameter MAXLOCKS.
If a transaction requires more than 10% of the lock list for locks onto a table, all the multiple row locks are converted into a single table lock (this is called an 'escalation'). If several transactions escalate at the same time, wait situations occur since only one transaction can set the table lock.
There is no 'management' of locks required in APO. If you are seeing many lock escalations in liveCache, an increase in the MAXLOCKS parameter might be necessary.
Thanks,
Ashwath

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

What is meant by set up matrices ,atp matrices ,simultion version in live cache

what is meant by set up matrices ,atp matrices ,simultion version in live cache
Please help

THere are overall versions, and you can copy these and view the data in both SNP and PPDS (or DP as well)
then there are specific simulation versions with the PPDS tool.
See below link.
http://help.sap.com/saphelp_scm70/helpdata/EN/e1/8e51341a06084de10000009b38f83b/frameset.htm
So it saves a version of the production orders. Saves it in livecache and then can either be used or discarded.
j

What are the possible live cache issues turn up for demand planning?

HI all,
Can anyone tell me the issues that may arise iin live cache and how to ensure the performance and maintenace of live cache that a planning area is utilizing it.
if the utilization is high how to bring it down!!
Can anyone pls guide me on this!!!
Thanks
Pooja

Hi Pooja,
1) Accumulation of logs created during demand planning jobs will have an impact on performance
and affect livecache and hence to be cleared periodically
2) Livecache consistency check to be performance at planned intervals
which will reduce livecache issues
3) Through om13 transaction, you can analyse the livecache and LCA objects
and act accordingly
4) You can also carry out /SAPAPO/PSTRUCONS - Consistency Check for Planning Object
Structure and /SAPAPO/TSCONS - Consistency Check for Time Series Network related to
demand planning to avoid livecache issues later
Regards
R. Senthil Mareeswaran.

Live Cache Failed (DBM error)

Hi,
I am getting following error while starting live cache(LC10)
"Error DBMCLI_COMMAND_EXECUTE_ERROR when starting liveCache LC1 on server system"
Server: system
Users: SAPUSER
Logical Command: DBMRFC
Parameter: exec_lcinit restart
Name and Server     : LC1 - system
DBMRFC Function     : DBM_EXECUTE
Command             : exec_lcinit restart
Error               : DBM Error
Return Code         :     -24964
Error Message       : ERR_EXECUTE: error in program execution#
0,sap\lcinit LC1 restart -uDBM , -uDBA , -uSQL ,
liveCache LC1 (restart)
The liveCache state is OFFLINE
DBMServer 7.6.00   Build 029-123-130-265
starting LC1 into ONLINE
ERROR : restart not possible [please check knldiag!!]
ERROR : liveCache LC1 not started (see "d:\sapdb\data\wrk\LC1\lcinit.log")
In Transaction DB59 i tried connection test "Connect. test with "native SQL" ( LCA ) unsuccesful"
how to restart Live Cache again? what will be the problem?
regards
Thennarasu

Hello,
what's wrong with the hint you already got?
> ERROR : restart not possible [please check knldiag!!]
Check the knldiag and then we might be able to do something about this issue.
regards,
Lars

BAPI to get the Quantity from orders in live cache.

Hi Folks,
Can any body provide me the BAPI to get the quantity value for the orders saved in the Live Cache. I tried using the BAPI
BAPI_SLSRVAPS_GETLIST2 ... but its not fetching any records for me. what else i need to provide it as input.
Thanks in advance.
Thanks & Regards,
Ramana

Check this thread.
Delete In-Transits.
In-Transit is not a particular order. Any Goods Movement from one location to another location will be considered as In-Transit.
Let's say Plant A is sending Product P1 to DC B against a Purchase Order.
In that case in plant A the stock will be reduced by the quauntity of goods being shipped.
At DC B, the Purchase Order will become In-Transit Stock.
Thanks,
Somnath

Some concern about Live cache Homogeneous System copy

Hi All,
I need to do the Homogeneous system copy SCM 5.0 / Live cache 7.6.00 on AIX. Following are the Source and target System SID for Live cache. Moreover I had check the respective SAP note 457425 and 877203 but still having some concern.
Source System
Live cache SID           =      SCD
Live cache user ID      =      SAPSCD
Live Database instant software owner = scdadm
Live cache Data Size      = 8 GB ( 4 Data volume / 2 GB each / auto extend off)
Target System
Live cache SID           =      SCT
Live cache user ID      =      SAPSCT
Live Database instant software owner = sctadm
Live cache Data Size      = 4 GB ( 2 Data volume / 2 GB each / auto extend off)
For same I having following concern.
1.     Since there is difference between source system and target system size / data volume number what action I need to take on target system. Do I need to add two more data volume into the target system?
2.     After complication of database restore on target the system do I need to change the Live cache user ID (i.e. SAPSCD to SAPSCT)?
or
It is just fine to change the log on data in Integration tab in LC10.
Please let me know some more information on same.
Thanks,
Harshal

Hello Harshal,
"1. Since there is difference between source system and target system size / data volume number what action I need to take on target system. Do I need to add two more data volume into the target system?"
Please pay attention to the SAP note :: 457425    Homogenous liveCache copy using backup/restore
Please update the thread withy additional information ::
What is the version of the source liveCache? What is the version of the target liveCache?
How much data do you have in the source liveCache?
And you need to have the size data area of the target liveCache to be able to restore the databackup created in the source liveCache.
So by the size of the data volumes in the source liveCache, it's not clear how much data you have.
"2. After complication of database restore on target the system do I need to change the Live cache user ID (i.e. SAPSCD to SAPSCT)?"
Please review the SAP note 877203.
You could rename the user SAPSCD to SAPSCT using the SAP note 877203 steps
OR
You could have the user SAPSCD in the target liveCache as Standard liveCache user &
After you run the homogenous liveCache copy using backup/restore procedure you need
to change the LCA/LDA/LEA connection with user SAPSCD on target system and
set the user SAPSCD to the user containers ( please see the SAP note 616555 for more details )
Before to restart the liveCache in LC10.
PS: Please pay attention about the value of the liveCache parameter _UNICODE.
      What are the values of this parameter in the source & target liveCache?
Thank you and best regards, Natalia Khlopina

Why we need live cache along with RDB in APO

Hello Expert,
I recently entered to APO module so want to know about live cache and why we really need comparing to RDB and what RDB cannot do that live cache can do?

SRS,
Functionalities are pretty much the same. LiveCache is a relational Database, built on MaxDB.
Advantage of LC is that most of the data is stored in memory rather than on disk storage. Data access and retrieval is substantially faster from memory than from disk storage.
Best Regards,
DB49

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 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

Error on starting Live Cache

Dear All
I have a SCM 7.0 application with Live Cache installed. The same was working fine till few days back.
However, now, when I am trying to start Live Cache using LC10, I am receiving an error as per the lcinit.log.
START *****************************
liveCache SCM (restart)
01.07.2010
11:09
Installation path is D:\sapdb\SCM\db
Operating system is Windows Server 2003 family
The liveCache state is OFFLINE
DBMServer 7.7.04 Build 029-123-196-543
Starting SCM into ADMIN
Starting SCM into ONLINE
ERR
-24988,ERR_SQL: SQL error
-902,I/O error
3,Database state: OFFLINE
Internal errorcode, Error code 9050 "disk_not_accessible"
20017,RestartFilesystem failed with 'I/O error'
ERROR : Restart not possible (please check KnlMsg)
ERROR : liveCache SCM not started
01.07.2010
11:09
END ******************************
Any suggestions
Regards
Lokesh

HI there,
why don't you take a closer look to what is in the message?
> Internal errorcode, Error code 9050 "disk_not_accessible"
> 20017,RestartFilesystem failed with 'I/O error'
> ERROR : Restart not possible (please check KnlMsg)
There is a problem with the liveCache disks.
This problem prevents that the liveCache can be started.
For more information you should look into the KNLMSG file.
Why don't you just do that?
The file will tell you what file is the problem and what kind of problem there is with the file.
regards,
Lars

What is live-cache?

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