![[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**: - [[IndexScan]] - [[FunctionScan]] - [[Result]] - [[SubqueryScan]] - [[Materialize]] - [[TidScan]] - [[HashJoin]] - [[SeqScan]] - [[TableFuncScan]] - [[ValuesScan]] - [[CTEScan]] - [[BitmapIndexScan]] - [[MergeJoin]] - [[BitmapAndBitmapOr]] - [[WindowAgg]] - [[ProjectSet]] - [[RecursiveUnion]] - [[BitmapHeapScan]] - [[Aggregate]] - [[SetOp]] - [[NestedLoop]] - [[IndexOnlyScan]] - [[Limit]] - [[ModifyTable]] - [[MergeAppend]] - [[Sort]] - [[SampleScan]] - [[Unique]] - [[CustomScanForeignScan]] - **Resources**: [[Memory]], [[CPU]]