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what is Live cache ?

Hello,

What is live cache? Please give the procedure to activate the same.

Is it the connection between R/3 and APO which transfers the data dynamically to r/3 to APO and APO TO r/3.

Please let me know my understanding is correct.

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5 Answers

  • Best Answer
    Apr 11, 2008 at 11:52 AM

    Hi ravindra deokule

    liveCache is one of the database used in APO system.

    APO system has 2 database APODB and liveCache.

    Generally master data and some other data are stored in APODB.

    And some part of transaction data (most of the part) are stored

    in liveCache.

    For APODB, you can use normal DB like Oracle, MSSQL, DB2, MAXDB.

    For liveCache, their is no choice. (liveCache is one of the function

    of MAXDB).

    From new SCM release, you can use MAXDB for APODB and liveCache.

    (But still there is 2 kinds of DB).

    If you have DB knowlege, maybe you can get rough image of liveCache.

    (Compared to normal DB, liveCache has more bigger datacache. So

    all data can be stored in dataCache. <Off course this require

    certain amount physical memory>).

    Since most of the data are stored in dataCache (it is better to be

    stored in datacache. Otherwise expensive disk access occur), APO

    application can access data speedly.

    (liveCache data is accessed by special routins that are called

    from function module start with /sapapo/OM*)

    liveCache is often called memory based database. But actually it also

    has DB (disk). So same as other DB, DB(disk) has all data. And

    its copy is stored in dataCache (memory). The difference between

    other DB and liveCache is, it is recommended to store all the data

    in dataCache in liveCache, and if most of the data is stored in

    liveCache, this means data is on memory. Therefore liveCache is

    called memory based database.

    About the connection between R/3.

    The data exchange between R/3 and APO is done by qRFC.

    This interface is called CIF.

    So if someone create data in APO, transaction data is stored in

    liveCache. As well, this creation also create some even to create

    qRFC data to R/3. So this created data is sent to R/3 and stored in

    R/3 database. Then this data comes back with R/3 document number to APO

    with qRFC format. Then when it arrive in APO, qRFC is executed

    and within this function module, APODB and liveCache is accessed

    via several function modules including /SAPAPO/OM*.

    So if you use SCM system, you have to be careful to the consistency

    between APO and R/3 (this consistency check can be done by delta report)

    and APODB - liveCache. (Since some of the data are stored in APODB and

    liveCache, and there is some relatation between APODB and liveCache)

    I hope this explanation help you

    Best Regards

    keiji

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    Former Member
    Apr 16, 2008 at 08:28 PM

    Hello,

    1) If you have questions/problems with liveCache => please create the

    thread at MAXDB/liveCache forum: SAP MaxDB

    2) You are running the APO < You are SAP customer.> & You have questions/problems with liveCache => .

    As SAP customer you have the option to get the SAP support. You could create the SAP ticket

    to the component 'BC-DB-LVC' or 'BC-DB-LCA', the SAP support could logon via OSS to your

    system and take a look closer on this issue.

    3) "what is Live cache ? "

    => Please read the answer on this question at

    https://www.sdn.sap.com/irj/sdn/livecache

    4) "You can use program RSLVCINIT to activate LC or also your transaction LC10 to do this interactively."

    You could use the Abap report RSLVCINIT to initialize the liveCache on the SAP system.

    For SAP liveCache documentation in English < See the SAP note 767598 >: For example,

    http://help.sap.com/saphelp_nw70/helpdata/en/b6/cbdda6248ff648ae9f39f8e28eb24f/frameset.htm

    -> Database Administration in CCMS: SAP liveCache Technology

    -> liveCache Assistant -> liveCache: Monitoring -> Administration -> liveCache Operating

    -> Initializing the liveCache

    5) The liveCache information/documents also available at SAP link ::

    service.sap.com/scm -> SAP SCM Technology

    < Please review the documents "Architecture overview" , "liveCache overview",

    Installation and Upgrade overview , … >

    ****

    6) When you are installing the APO, SCM system => you need to install the liveCache,

    as it's described in the liveCache installation guide if you will run APO.

    After the livCache is install, updated => follow the post installation steps from the liveCache installation guide :).

    The liveCache installation guides are available at SAP links

    service.sap.com/instguides -> SAP Business Suite Applications

    -> SAP SCM -> SAP SCM Server -> Using SAP SCM < your version> Server

    7) For the SAP SCM Integration information/documents please go at

    service.sap.com/scm -> SAP SCM Technology

    < Please review the document "Integration overview ". >

    &&

    service.sap.com/scm -> SAP SCM Technology

    < check the document at -> Information on SCM 4.1 and prior releases

    Information on SCM 4.1 and prior releases you will find here.

    -> click on <here> ->

    See "Integration" section

    ++

    Best Practices for mySAP SCM Solution Management

    -> "Manage APO Core Interface in SAP APO (3.x) / mySAP SCM (4.x/5.0) " >

    Thank you and best regards, Natalia Khlopina

    Edited by: Natalia Khlopina on Apr 16, 2008 4:30 PM

    Edited by: Natalia Khlopina on Apr 16, 2008 4:31 PM

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    Former Member
    Apr 10, 2008 at 03:38 PM

    You can use program RSLVCINIT to activate LC or also your transaction LC10 to do this interactively.

    Connection between APO and R3 is through CIFor core interface. Data in APO is stored either in static tables (like most of the configuration or master data) or in Live Cache (a memory resident engine) for transaction data primarily. Live Cache also stores a snapshot of master data and config objects.

    To your point though, data from R3 does come in through CIF and sit in Livecache in APO.

    LC can store data in Order Objects(more relevant for dp and snp) or Time series(more relevant for forecasting and gatp)

    Info on Live cache

    http://help.sap.com/saphelp_scm50/helpdata/en/be/35455a0962f24a87e12d8d3031015c/frameset.htm

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    Former Member
    Apr 11, 2008 at 06:29 AM

    Hello,

    Thanks a lot for your answer.

    I am new in APO and your answers are helping me to learn.

    Regards,

    Ravindra Deokule

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    Former Member
    Apr 17, 2008 at 06:33 AM

    Hello,

    Thanks a lot for your answer.

    I am new in APO and your answers are helping me to learn about the new things.

    Thanks.

    Regards,

    Ravindra Deokule

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