![[assets/ex_bitmapindexscan.png|256]] - **Description**: Scans a bitmap index. - **Performance**: Efficient index scan producing bitmaps. - **Factors**: Index selectivity and size, CPU costs. - **Cost**: `cpu_index_tuple_cost * index entries scanned` - ![[assets/ex_bmp_index.svg|200x200]] - **Operates on**: [[Structures/Index|Index]] - **Workloads**: - [[Workloads/IO]] - [[Workloads/Sub/DataFileRead]] - [[Workloads/LWLock]] - [[Workloads/Sub/BufferContent]] - [[Workloads/Sub/BufferMapping]] - [[Workloads/IPC]] - [[Workloads/Sub/ParallelBitmapScan]]