https://weidongzhou.wordpress.com/2016/04/06/direct-path-read-vs-buffer-cache-read/
http://afatkulin.blogspot.com/2012/07/serial-direct-path-reads-in-11gr2-and.html
https://avdeo.com/tag/_small_table_threshold/
https://www.centroid.com/direct-reads-and-smart-scan-exadata/
https://www.centroid.com/smart-scan-why-smalltablethreshold-important/
http://oracledoug.com/serendipity/index.php?/archives/1321-11g-and-direct-path-reads.html
https://fritshoogland.wordpress.com/2017/09/08/the-full-table-scan-direct-path-read-decision-for-version-12-2/
https://alexanderanokhin.com/2018/10/22/_serial_direct_read-is-not-a-criteria-for-cursor-non-sharing/
https://www.youtube.com/watch?v=bTuwFAUEgSw
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