Oracle creates a user with read-only permission in four simple steps

 First step 、 Create user . Create a new user with administrator privileges ：
create user  user name  identified by  password  default tablespace  Table space ;


 The second step 、 Assign connection permission :
grant connect to  user name ;


 The third step 、 Assign table permissions 
grant select on owner. Table name  to  user name ;

 If there are multiple tables , It can be used selece Convert batch execution statements ：
select 'grant select on '||owner||'.'||object_name||' to  user name ;'
from dba_objects
where owner in ('owner')
and object_type='TABLE';
 

 Step four 、 Create synonyms ：
create or replace SYNONYM  user name . Table name  FOR owner. Table name ;
 
 If there are multiple tables , It can be used selece Convert batch execution statements ：
SELECT 'create or replace SYNONYM   user name .'||object_name||' FOR '||owner||'.'||object_name||';'  from dba_objects 
where owner in ('owner')
and object_type='TABLE';