Application Development Discussions
Join the discussions or start your own on all things application development, including tools and APIs, programming models, and keeping your skills sharp.
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

what is the difference between lock mode E and X.

Former Member

‎03-01-2008 11:03 AM

what is the difference between lock mode E and X.

2 REPLIES 2

Former Member

‎03-01-2008 12:56 PM

0 Kudos

Hi

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

Lock modes:

S (Shared):

Several users (transactions) can access 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 set on an object that already has a shared lock will be rejected.

E (Exclusive).

An exclusive lock protects the locked object against all types of locks from other transactions. Only the same lock owner can reset the lock (accumulate).

X (eXclusive non-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. Each further lock request will be rejected.

O (Optimistic):

Optimistic locks initially behave like shared locks and can be converted into exclusive locks.

If it is helpful rewards points.

Regards

Pratap.M

Former Member

‎03-01-2008 3:42 PM

0 Kudos

SAP Provide three type of Lock objects.

Shared lock

S (Shared)

Several users (transactions) can access locked data at the same time in display mode. Requests from further shared locks are accepted, even if they are from different users. An exclusive lock set on an object that already has a shared lock will be rejected.

Exclusive lock

E (Exclusive)

An exclusive lock protects the locked object against all types of locks from other transactions. Only the same lock owner can reset the lock (accumulate).

Exclusive but not cumulative lock

X (eXclusive non-cumulative)

Whereas exclusive locks can be requested several times by the same transaction and released one by one, an exclusive, non-cumulative lock can only be requested once by the same transaction. Each further lock request will be rejected.

Optimistic lock

O (Optimistic)

Optimistic locks initially behave like shared locks and can be converted into exclusive locks. See

So going by this definition the system will not allow access to any body else.

If the system allows access then the type of lock is shared lock.