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Former Member
Jul 17, 2013 at 12:12 PM

Difference between E & X locks


Hi All,

What is the difference between Write Lock(E) and Enhanced Write Lock(X) in SM12.

I have learned that E lock doesn't allow read or write and X lock doesn't allow even more operations from the same transaction.

"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."

Could you please explain what are the further accesses, and transaction here means SM12? What are the different transactions..

Thank you.