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Alter session force parallel query doesn’t really force anything

Jonathan Lewis has already written about this behavior from the angle of PARALLEL hints.
I’m writing a similar article just because the word FORCE in the ALTER SESSION FORCE PARALLEL QUERY syntax. Force should mean that some behavior would always happen (when possible), right? Let’s test:
SQL> CREATE TABLE t AS SELECT * FROM dba_objects; Table created. SQL> CREATE INDEX i ON t(owner); Index created. SQL> @gts t Gather Table Statistics for table t.