Smart Scan will not work with Inter-Block Chaining and Can cause Performance Degradation
Last updated on DECEMBER 23, 2017
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Information in this document applies to any platform.
Performance on Exadata may suddenly get worse and the amount of Smart Scan may reduce. You may see excessive "cell single block physical read" waits instead of the expected "cell smart table scan". This may be after new columns have been added to an existing table.
The change may be because of any activity which results in the row size increasing resulting in more inter-block chaining
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