How can I get the difference of tables between two oracle server?

Question

We team have 2 oracle servers in the same version.
one is develop server and the other is priduct server.
I want to know what is difference in tables define between the two oracle servers.
give me a method or a step or a sql script or a tool to compare these two set of tables.
Edited by: Oracle-Sunmeng on Aug 1, 2012 6:36 PM

Answer 1

Hi Sunmeng,
Does Database Link exists between Databases ??
If I am Clear, Are you looking Something like this.
To Identify the tables difference, you can query the USER_TAB_COLUMNS view.
SELECT DISTINCT table_name, 'User1' AS user_table
           FROM user_tab_columns
UNION ALL
SELECT DISTINCT table_name, 'User2' AS user_table
           FROM user_tab_columns@dblink
       ORDER BY 1;Which gets us all the Tables available in Both User. where you can filter based on what
you require.
Similary, you for column difference
SELECT   table_name, column_name, 'User1' AS user_table
    FROM user_tab_columns
UNION ALL
SELECT   table_name, column_name, 'User2' AS user_table
    FROM user_tab_columns@dblink
ORDER BY 1;If you need to count the no of columns in both Tables of different databases. Then try this,
SELECT table_name, 'User1' user_name,
       (SELECT MAX (column_id)
          FROM user_tab_columns a
         WHERE a.table_name = b.table_name) colno
  FROM user_tables b
UNION ALL
SELECT table_name, 'User2' user_name,
       (SELECT MAX (column_id)
          FROM user_tab_columns@dblink a
         WHERE a.table_name = b.table_name) colno
  FROM user_tables@dblink b;And, what the Columns in both tables may be same but, if datatype and length of column differs ?????
Thanks,
Shankar
Edited by: Shankar Viji on Aug 1, 2012 10:47 PM
Edited by: Shankar Viji on Aug 1, 2012 10:49 PM