# LWLock (The Shoulder Nudge) ![[assets/wl_lw_lock.png|256]] Waiting to acquire a **lightweight lock** on a shared memory data structure. LWLocks are very short-duration and protect the internal plumbing of the engine. Think of it as the staff members gently nudging each other aside to look at the same shared cheat sheet. --- ![[Workloads/LWLock/Management/_Management]] --- ![[Workloads/LWLock/AIO/_Aio]] --- ![[Workloads/LWLock/Parallel/_Parallel]] --- ![[Workloads/LWLock/Locking/_Locking]] --- ![[Workloads/LWLock/Buffers/_Buffers]] --- ![[Workloads/LWLock/ControlFile/_ControlFile]] --- ![[Workloads/LWLock/RelationMap/_RelationMap]] --- ![[Workloads/LWLock/Xact/_Xact]] --- ![[Workloads/LWLock/Subtrans/_Subtrans]] --- ![[Workloads/LWLock/MultiXact/_MultiXact]] --- ![[Workloads/LWLock/CommitTs/_CommitTs]] --- ![[Workloads/LWLock/Serial/_Serial]] --- ![[Workloads/LWLock/Notify/_Notify]] --- ![[Workloads/LWLock/Replication/_Replication]] --- ![[Workloads/LWLock/WAL/_WAL]]