SQL> conn hr/hr

SQL> desc user_tables

SQL> select TABLE_NAME from user_tables;

SQL> desc user_views

SQL> select VIEW_NAME from user_views;

SQL> desc user_indexes

SQL> select INDEX_NAME, TABLE_NAME from user_indexes;

 

SQL> conn scott/tiger

SQL> select TABLE_NAME from user_tables;

SQL> select VIEW_NAME from user_views;

SQL> select INDEX_NAME, TABLE_NAME from user_indexes;

 

SQL> conn hr/hr

SQL> select count(*) from all_tables;

 

SQL> conn scott/tiger

SQL> select count(*) from all_tables;

 

SQL> conn hr/hr

SQL> select count(*) from dba_tables;

 

SQL> conn scott/tiger

SQL> select count(*) from dba_tables;

 

SQL> desc v$instance

SQL> desc v$database