Please suggest me good links for locking mechanism in SAP

Please suggest me good links for locking mechanism in SAP
thanks,

Hi Akash,
Here is a small description on lock object.
The lock mode controls whether several users can access data records at the same time. The lock mode can be assigned separately for each table in the lock object. When the lock is set, the corresponding lock entry is stored in the lock table of the system for each table.
Access by more than one user can be synchronized in the following ways:
Exclusive lock: The locked data can only be displayed or edited by a single user. A request for another exclusive lock or for a shared lock is rejected.
Shared lock: More than one user can access the locked data at the same time in display mode. A request for another shared lock is accepted, even if it comes from another user. An exclusive lock is rejected.
Exclusive but not cumulative: Exclusive locks can be requested several times from the same transaction and are processed successively. In contrast, exclusive but not cumulative locks can be called only once from the same transaction. All other lock requests are rejected.
Check out this thread:
LOCK OBJECT?
Regards,
Vivek
PS: Award points if helpful

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    Hi Akash,
    Here is a small description on lock object.
    The lock mode controls whether several users can access data records at the same time. The lock mode can be assigned separately for each table in the lock object. When the lock is set, the corresponding lock entry is stored in the lock table of the system for each table.
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    Check out this thread:
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    Regards,
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    PS: Award points if helpful

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