![[assets/wl_io_buffercontent.png|256]] - **Description**: Indicates that a session is waiting to either read or write a data page that is already in memory, but another session currently holds a lock on that page. This reflects contention for accessing shared memory buffers. - **Operations**: - [[Operations/IndexScan]] - [[Operations/FunctionScan]] - [[Operations/Result]] - [[Operations/SubqueryScan]] - [[Operations/Materialize]] - [[Operations/TidScan]] - [[Operations/HashJoin]] - [[Operations/SeqScan]] - [[Operations/TableFuncScan]] - [[Operations/ValuesScan]] - [[Operations/CTEScan]] - [[Operations/BitmapIndexScan]] - [[Operations/MergeJoin]] - [[Operations/BitmapAndBitmapOr]] - [[Operations/WindowAgg]] - [[Operations/ProjectSet]] - [[Operations/RecursiveUnion]] - [[Operations/BitmapHeapScan]] - [[Operations/Aggregate]] - [[Operations/SetOp]] - [[Operations/NestedLoop]] - [[Operations/IndexOnlyScan]] - [[Operations/Limit]] - [[Operations/ModifyTable]] - [[Operations/MergeAppend]] - [[Operations/Sort]] - [[Operations/SampleScan]] - [[Operations/Unique]] - [[Operations/CustomScanForeignScan]] - **Resources**: [[Resources/Memory|Memory]], [[Resources/CPU|CPU]]