Do not worry about the other statistics shown here—they are part of this chapter as well. Note that cell physical IO bytes eligible for predicate offload simply counts the physical size of the segment in the data blocks in data files and not the “eventual” data size after any decompression, filtering, or projection.

If this number does not increase for your session’s V$SESSTAT (or Statspack/AWR data when looking at the whole instance), then this is another indicator that Smart Scans are not used. Any block ranges scanned through, or even skipped (thanks to storage index optimizations), by a Smart Scan session should increment this statistic. Another fact worth knowing is that when a Smart Scan falls back to passthrough (full-block shipping) ...

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