ORA-20200
When we ran a STATSPACK report, we got error ORA-20200.
SQL> @?/rdbms/admin/spreport.sql
...
ORA-20200: Database/Instance 356760607/1 does not exist in
STATS$DATABASE_INSTANCE
ORA-06512: at line 23
This is because you have not enabled the snapshot of STATSPACK. To solve ORA-20200, you should run spauto.sql before running the report.
SQL> conn perfstat/perfstat
Connected.
SQL> @?/rdbms/admin/spauto.sql
...
There's a complete procedure about how to install and run STATSPACK, you may take a look.