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Former Member

Info on Lock Object

Hello,

ENQUEUE functions are used to set a lock object. Is there any function which gives me details about lock object under which object is locked.

I can have this info by ENQUEUE function but if lock is not set this function will set the lock which i don't want.

If anyone knows, please pass the info.

Regards,,,

Sunil Joyous

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2 Answers

  • Best Answer
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    Former Member
    Aug 21, 2007 at 10:15 AM

    Kiran,

    This doesn't answer my question. I don't want to know what is lock object. I want to know if there is a function in SAP where i pass the object no & returns me the lock object under which it is locked.

    Regards,,,

    Sunil

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    • Former Member

      You can use the function ENQUEUE_READ. Pass the name of the locked table in the parameter GNAME and the name of the user in GUSER.

      Hope this helps.

      Sudha

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    Former Member
    Aug 21, 2007 at 09:58 AM

    Hi Sunil

    see the doc on lock objects

    Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.

    SAP Provide three type of Lock objects.

    - Read Lock(Shared Locked)

    protects read access to an object. The read lock allows other transactions read access but not write access to

    the locked area of the table

    - Write Lock(exclusive lock)

    protects write access to an object. The write lock allows other transactions neither read nor write access to

    the locked area of the table.

    - Enhanced write lock (exclusive lock without cumulating)

    works like a write lock except that the enhanced write lock also protects from further accesses from the

    same transaction.

    You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.

    Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.

    Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.

    Technicaly:

    When you create a lock object System automatically creat two function module.

    1. ENQUEUE_<Lockobject name>. to insert the object in a queue.

    2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.

    You have to use these function module in your program.

    check this link for example.

    http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm

    tables:vbak.

    call function 'ENQUEUE_EZLOCK3'

    exporting

    mode_vbak = 'E'

    mandt = sy-mandt

    vbeln = vbak-vbeln

    • X_VBELN = ' '

    • _SCOPE = '2'

    • _WAIT = ' '

    • _COLLECT = ' '

    • EXCEPTIONS

    • FOREIGN_LOCK = 1

    • SYSTEM_FAILURE = 2

    • OTHERS = 3

    .

    if sy-subrc <> 0.

    • MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO

    • WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

    endif.

    Normally ABAPers will create the Lock objects, because we know when to lock and how to lock and where to lock the Object then after completing our updations we unlock the Objects in the Tables

    http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm

    purpose: If multiple user try to access a database object, inconsistency may occer. To avoid that inconsistency and to let multiple user give the accessibility of the database objects the locking mechanism is used.

    Steps: first we create a loc object in se11 . Suppose for a table mara. It will create two functional module.:

    1. enque_lockobject

    1. deque_lockobject

    before updating any table first we lock the table by calling enque_lockobject fm and then after updating we release the lock by deque_lockobject.

    Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.

    SAP Provide three type of Lock objects.

    - Read Lock(Shared Locked)

    protects read access to an object. The read lock allows other transactions read access but not write access to

    the locked area of the table

    - Write Lock(exclusive lock)

    protects write access to an object. The write lock allows other transactions neither read nor write access to

    the locked area of the table.

    - Enhanced write lock (exclusive lock without cumulating)

    works like a write lock except that the enhanced write lock also protects from further accesses from the

    same transaction.

    You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.

    Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.

    Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.

    Technicaly:

    When you create a lock object System automatically creat two function module.

    1. ENQUEUE_<Lockobject name>. to insert the object in a queue.

    2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.

    Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.

    SAP Provide three type of Lock objects.

    - Read Lock(Shared Locked)

    protects read access to an object. The read lock allows other transactions read access but not write access to

    the locked area of the table

    - Write Lock(exclusive lock)

    protects write access to an object. The write lock allows other transactions neither read nor write access to

    the locked area of the table.

    - Enhanced write lock (exclusive lock without cumulating)

    works like a write lock except that the enhanced write lock also protects from further accesses from the

    same transaction.

    You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.

    Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.

    Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.

    Technicaly:

    When you create a lock object System automatically creat two function module.

    1. ENQUEUE_<Lockobject name>. to insert the object in a queue.

    2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.

    http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm

    GO TO SE11

    Select the radio button "Lock object"..

    Give the name starts with EZ or EY..

    Example: EYTEST

    Press Create button..

    Give the short description..

    Example: Lock object for table ZTABLE..

    In the tables tab..Give the table name..

    Example: ZTABLE

    Save and generate..

    Your lock object is now created..You can see the LOCK MODULES..

    In the menu ..GOTO -> LOCK MODULES..There you can see the ENQUEUE and DEQUEUE function

    Lock objects:

    http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm

    http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm

    Match Code Objects:

    http://help.sap.com/saphelp_nw2004s/helpdata/en/41/f6b237fec48c67e10000009b38f8cf/content.htm

    http://searchsap.techtarget.com/tip/0,289483,sid21_gci553386,00.html

    See this link:

    http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm

    Check these links -

    lock-objects

    lock-objects

    lock-objects

    reward points to all helpful answers

    kiran.M

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