Comparison of schemas across different database Instances

Question

Hi All,
I need to compare around 8 schemas across 4 different instances. We expect them to be same (atleast constraints and indxes) but we have some exceptions. Don't have any database link. I tried using PL/SQL developer , it gives only changes for source db vs target db. Which is the best tool for this purpose?

Answer 1

Here is for remote Schema comparison:
compareRemoteSchemaDDL.sql
This script compares the database tables and columns between
two schemas in separate databases (local schema and a remote
schema).
This script should be run from the schema of the local user.
A database link will need to be created in order to compare
the schemas.
column sid_name new_value local_schema
column this_user new_value local_user
select substr(global_name, 1, (instr(global_name, '.')) - 1) sid_name, user this_user
from global_name;
select db_link from user_db_links;
define remote_schema=&which_db_link
spool &spool_file
set verify off
column len format 999
column cons_column format a20 truncate
column object_name format a30
break on table_name nodup skip 1
set pages 999
set lines 110
prompt ********************************************************************
prompt *
prompt * Comparison of Local Data Base to Remote Data Base
prompt *
prompt * User: &local_user
prompt *
prompt * Local Data Base: &local_schema
prompt * Remote Data Base: &remote_schema
prompt *
prompt ********************************************************************
prompt **** Additional Tables on Local DB &local_schema ****
Select table_name from user_tables
MINUS
Select table_name from user_tables@&remote_schema
order by 1;
prompt **** Additional Tables on Remote DB &remote_schema ****
Select table_name from user_tables@&remote_schema
MINUS
Select table_name from user_tables
order by 1;
prompt **** Additional Columns on Local DB &local_schema ****
Select table_name, column_name from user_tab_columns
MINUS
Select table_name, column_name from user_tab_columns@&remote_schema
order by 1, 2;
prompt **** Additional Columns on Remote DB &remote_schema ****
Select table_name, column_name from user_tab_columns@&remote_schema
MINUS
Select table_name, column_name from user_tab_columns
order by 1, 2;
prompt **** Columns Changed on Local DB &local_schema ****
Select c1.table_name, c1.column_name, c1.data_type, c1.data_length len
from user_tab_columns c1, user_tab_columns@&remote_schema c2
where c1.table_name = c2.table_name and c1.column_name = c2.column_name
and ( c1.data_type <> c2.data_type or c1.data_length <> c2.data_length
or c1.nullable <> c2.nullable
or nvl(c1.data_precision,0) <> nvl(c2.data_precision,0)
or nvl(c1.data_scale,0) <> nvl(c2.data_scale,0) )
order by 1, 2;
prompt **** Additional Indexes on Local DB &local_schema ****
Select decode(substr(INDEX_NAME,1,4), 'SYS_', 'SYS_', INDEX_NAME) INDEX_NAME
from user_indexes
MINUS
Select decode(substr(INDEX_NAME,1,4), 'SYS_', 'SYS_', INDEX_NAME) INDEX_NAME
from user_indexes@&remote_schema
order by 1;
prompt **** Additional Indexes on Remote DB &remote_schema ****
Select decode(substr(INDEX_NAME,1,4), 'SYS_', 'SYS_', INDEX_NAME) INDEX_NAME
from user_indexes@&remote_schema
MINUS
Select decode(substr(INDEX_NAME,1,4), 'SYS_', 'SYS_', INDEX_NAME) INDEX_NAME
from user_indexes;
prompt **** Additional Objects on Local DB &local_schema ****
Select object_name, object_type from user_objects
where object_type in ( 'PACKAGE', 'FUNCTION', 'PROCEDURE', 'VIEW', 'SEQUENCE' )
MINUS
Select object_name, object_type from user_objects@&remote_schema
where object_type in ( 'PACKAGE', 'FUNCTION', 'PROCEDURE', 'VIEW', 'SEQUENCE' )
order by 1, 2;
prompt **** Additional Objects on Remote DB &remote_schema ****
Select object_name, object_type from user_objects@&remote_schema
where object_type in ( 'PACKAGE', 'FUNCTION', 'PROCEDURE', 'VIEW', 'SEQUENCE' )
MINUS
Select object_name, object_type from user_objects
where object_type in ( 'PACKAGE', 'FUNCTION', 'PROCEDURE', 'VIEW', 'SEQUENCE' )
order by 1, 2;
prompt **** Additional Triggers on Local DB &local_schema ****
Select trigger_name, trigger_type, table_name from user_triggers
MINUS
Select trigger_name, trigger_type, table_name from user_triggers@&remote_schema
order by 1;
prompt **** Additional Triggers on Remote DB &remote_schema ****
Select trigger_name, trigger_type, table_name from user_triggers@&remote_schema
MINUS
Select trigger_name, trigger_type, table_name from user_triggers
order by 1;
Prompt **** Additional Constraints on Local DB &local_schema ****
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
CONSTRAINT_TYPE
from USER_CONSTRAINTS
MINUS
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
CONSTRAINT_TYPE
from USER_CONSTRAINTS@&remote_schema
order by 1, 2, 3;
Prompt **** Additional Constraints on Remote DB &remote_schema ****
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
CONSTRAINT_TYPE
from USER_CONSTRAINTS@&remote_schema
MINUS
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
CONSTRAINT_TYPE
from USER_CONSTRAINTS
order by 1, 2, 3;
Prompt **** Additional Constraints Columns on Local DB &local_schema ****
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
COLUMN_NAME cons_column
from USER_CONS_COLUMNS
MINUS
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
COLUMN_NAME cons_column
from USER_CONS_COLUMNS@&remote_schema
order by 1, 2, 3;
Prompt **** Additional Constraints Columns on Remote DB &remote_schema ****
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
COLUMN_NAME cons_column
from USER_CONS_COLUMNS@&remote_schema
MINUS
Select TABLE_NAME,
decode ( substr (CONSTRAINT_NAME,1,5), 'SYS_C', 'SYS_C',
CONSTRAINT_NAME ) CONSTRAINT_NAME,
COLUMN_NAME cons_column
from USER_CONS_COLUMNS
order by 1, 2, 3;
prompt **** Additional Public Synonyms on Local DB &local_schema ****
Select owner, synonym_name from dba_synonyms
where owner = 'PUBLIC'
and table_owner = UPPER('&local_user')
MINUS
Select owner, synonym_name from dba_synonyms@&remote_schema
where owner = 'PUBLIC'
and table_owner = UPPER('&local_user')
order by 1;
prompt **** Additional Public Synonyms on Remote DB &remote_schema ****
Select owner, synonym_name from dba_synonyms@&remote_schema
where owner = 'PUBLIC'
and table_owner = UPPER('&local_user')
MINUS
Select owner, synonym_name from dba_synonyms
where owner = 'PUBLIC'
and table_owner = UPPER('&local_user')
order by 1;
spool off
Daljit Singh