Check Invalid objects | Number of All objects in schema

Below query will fetch invalid objects from a particular schema, Provide username at highlighted area.

COLUMN object_name FORMAT A30

SELECT owner,

       object_type,

       object_name,

       status

FROM   dba_objects

WHERE  status = 'INVALID' and owner= '<USERNAME>'

ORDER BY owner, object_type, object_name;

To Fetch only count of all the objects in a schema.

select count(*) from dba_objects where owner='<USERNAME>';

To Fetch count of objects group by object type in schema level.

select object_type,count(*) from dba_objects where owner='<USERNAME>' group by object_type;