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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 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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