Statistics and histograms of character columns with length longer than 32 or 64 characters
(Doc ID 800089.1)
Last updated on FEBRUARY 15, 2019
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.
Some statistics(especially num_distinct) and histograms for a character column are incorrect when its length is longer than 32 characters.(64 characters in 12c) This can cause bad plans. We need to gather correct statistics for those columns.
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