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Oracle: Init parameter _ORACLE_SCRIPT

Scripts maintained under $ORACLE_HOME use $ORACLE_HOME/rdbms/admin/sqlsessstart.sql and sqlsessend.sql to set the value of _oracle_script to true or false.
A comment found in $ORACLE_HOME/md/admin/catmd.sql indicates that setting the value of _oracle_script to true prior to creating an object marks that object as Oracle-supplied.
Similarly, MOS Note 1566042.1 says that users that are created while _oracle_script is set to true will be considered administrative users.

See also

The init parameters

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