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SQL>
SQL> ALTER SESSION SET optimizer_dynamic_sampling = 0;
Session altered.
SQL>
SQL>
SQL> CREATE TABLE myTable AS SELECT * FROM all_objects;
Table created.
SQL>
SQL>
SQL> CREATE TABLE myTable2 AS SELECT object_id, object_name FROM myTable;
Table created.
SQL>
SQL> ALTER TABLE myTable2 ADD object_application VARCHAR2(12);
Table altered.
SQL>
SQL> UPDATE myTable2 SET object_application = 'WORKSHOP';
12597 rows updated.
SQL>
SQL> COMMIT;
Commit complete.
SQL>
SQL> SET AUTOTRACE TRACEONLY EXPLAIN;
SQL>
SQL>
SQL> ALTER SESSION SET optimizer_dynamic_sampling = 1;
Session altered.
SQL>
SQL>
SQL> SET AUTOTRACE OFF;
SQL>
SQL> DROP TABLE myTable2;
Table dropped.
SQL>
SQL> DROP TABLE myTable;
Table dropped.
SQL>
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