![[wl_io_buffermapping.png|256]] - **Description**: Occurs when a process is waiting to associate a data block with a buffer within the shared buffer pool. This often involves contention for lightweight locks that protect the buffer cache's hash table entries. - **Operations**: - [[IndexScan]] - [[SeqScan]] - [[BitmapIndexScan]] - [[NestedLoop]] - [[IndexOnlyScan]] - [[ModifyTable]] - **Resources**: [[Memory]], [[CPU]]