Procedure/Package to compare User Schemas

Question

Hello,
I'm looking for a way to compare the schema of two users. We have a group of developers that have their own schemas, and we need a way that we can find the differences between them.
I would greatly welcome any help or guidance provided.

Answer 1

The simplest I have been using is selecting everything from the views you wanna compare (user_objects, user_tables, user_indexes etc. etc.), spool the complete result to a different file per user and do a diff on unix (make sure you order by something). Although I wouldn't be surprised if there are more sofisticated tools to do this...
An example I used: (I only wanted to know object and constraint differences. The script assumes differences between multiple users on 2 different instances, but it should be easy to rewrite):
sqlplus $1 <<___EOF
set lines 100
set echo off
set feedback off
set heading off
set timing off
set long 40
col table_name a40 truncated
col constraint_type a8 truncated
col owner format a8 truncated
col object_type format a10 truncated
col object_name format a40 truncated
spool dbdiff1.lst
select owner, object_type, object_name from dba_objects where owner in
('USER1','USER2','USER3')
order by owner,object_type, object_name
select owner, table_name, constraint_type, search_condition from dba_constraints where owner in
('USER1','USER2','USER3')
order by owner,table_name, constraint_type, constraint_name
spool off
___EOF
sqlplus $2 <<___EOF
set lines 100
set echo off
set feedback off
set heading off
set timing off
set long 40
col table_name a40 truncated
col constraint_type a8 truncated
col owner format a8 truncated
col object_type format a10 truncated
col object_name format a40 truncated
spool dbdiff2.lst
select owner, object_type, object_name from dba_objects where owner in
('USER1','USER2','USER3')
order by owner,object_type, object_name
select owner, table_name, constraint_type, search_condition from dba_constraints where owner in
('USER1','USER2','USER3')
order by owner,table_name, constraint_type, constraint_name
spool off
___EOF
diff dbdiff1.lst dbdiff2.lst > dbdiff.out