How to enable autotrace in SQL*Plus

Connect as SYS and check if there's a PLAN_TABLE available:
```
sqlplus sys@orcl as sysdba

desc plan_table

select object_type, owner from all_objects where object_name = 'PLAN_TABLE';

select * from all_synonyms where synonym_name = 'PLAN_TABLE';
```
If it's not there, you can create it by running the utlxplan.sql script located in the RDBMS/ADMIN folder of your database home (e.g. C:\ora\db10\RDBMS\ADMIN\utlxplan.sql)

Grant the necessary privileges to your application schema (e.g. SCOTT):

grant select_catalog_role to scott;
grant select any dictionary to scott;