- **Description**: Scans a random sample of rows. - **Performance**: Depends on sampling method. - **Factors**: Sample size, sampling algorithm. - **Cost**: `sampling cost * sample size` - ![[ex_named_tuplestore_scan.svg|200x200]] - **Operates on**: [[Result Set]] - **Workloads**: - [[IO]] - [[DataFileRead]] - [[DataFilePrefetch]] - [[LWLock]] - [[BufferContent]]