Search notes:

Oracle: Automatic indexing

Enabling automatic indexing 
begin
   dbms_auto_index.configure('AUTO_INDEX_MODE', 'IMPLEMENT');
end;
/
In 21c, the init parameter optimizer_session_type can be set to ADHOC in a session to suspend automatic indexing for queries that are executed from this session.

See also

dba_auto_index_config
Indexes

Index

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