SAP AS ABAP Administration · Lock Management (Enqueue)

Both E and X are exclusive lock modes — what can the lock owner do with E that it cannot do with X?

Answer locked. Get the free KnowCard app to reveal it — plus spaced-repetition review so it actually sticks.

This is one card from the KnowCard library — thousands more across SAP, Linux, Python and more. In the app you get the answer, AI explanations, and cards that come back right before you would forget them. Free to start on iOS, Android or the web.

More in Lock Management (Enqueue)

On a classic single-instance ABAP system with no HA requirement, should you deploy a standalone enqueue server for the throughput boost?

Lock entries normally clear themselves — so why do stale entries pile up and block users, and what routine catches them?

You've found an old orphaned lock in SM12 and want to delete it — what two things must you verify first before removing it?

An instance has no ENQ work process — can you conclude it has no lock table either?

Under heavy load you want several enqueue work processes — why can't you spread them across different instances to balance the load?

SAP recommends running the enqueue server and message server on the same instance — what problem does splitting them onto different instances create?

Start learning today

Free to start — download the app or use it in your browser.