you cannot explain plan on a procedure or a package, only on a plain old SQL
statement. Your TYPE … statements cannot be executed by the SQL engine, only
by the PL/SQL engine and you can only use EXPLAIN PLAN for SQL engine stuff.
PS. Steven F. the Pl/SQL guru of gurus has lots of good advice for making PL/SQL
fast and furious. Have a quick Google for PL/SQL Best Practices and such like
and see what you get.
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