Search notes:

Oracle: SYS.COLUMN_STAT$

column_stat$ contains column-level statistics for the kernel layer.
Such column statistics are primarily used by Automatic Data Optimization (ADO) to perform ILM functionality such as evicting/bringing a column from/into memory.

See also

Related views such as dba_col_usage_statistics are created in catilm.sql.
dbms_ilm.flush_col_stats flushes all in-memory column statistics to column_stat$.

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