![[assets/ex_samplescan.png|256]] - **Description**: Scans a random sample of rows. - **Performance**: Depends on sampling method. - **Factors**: Sample size, sampling algorithm. - **Cost**: `sampling cost * sample size` - ![[assets/ex_named_tuplestore_scan.svg|200x200]] - **Operates on**: [[Structures/Result Set]] - **Workloads**: - [[Workloads/IO]] - [[Workloads/Sub/DataFileRead]] - [[Workloads/Sub/DataFilePrefetch]] - [[Workloads/LWLock]] - [[Workloads/Sub/BufferContent]]