- **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` - ![[ex_bmp_index.svg|200x200]] - **Operates on**: [[Math and Computation/Databases/Postgres/Structures/Index|Index]] - **Workloads**: - [[IO]] - [[DataFileRead]] - [[LWLock]] - [[BufferContent]] - [[BufferMapping]] - [[IPC]] - [[ParallelBitmapScan]]