Search notes:

Oracle: Extended statistics

There are two types of extended statitics:
Multicolumn statistics The focus is to gather statistics for sets of columns with correlating values (for example city and state, or age and income, or temperature and ice_cream_sales etc.)
Expression Statistics

See also

dba_stat_extensions
dbms_stats.create_extended_stats
The (undocumented) init parameters
function-based index
MOS Note 1489505.1: How Does Using Expression Statistics Differ from Using a Function-Based Index?

Index

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