SAP AS ABAP Administration · Lock Management (Enqueue)

What are the four SAP lock modes, and which one allows multiple concurrent holders?

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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?

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