Expdp QUERY options ?

Question

If i have two tables EMP, DEPT, i want to export data using datapump utility, but conditions are there in both the tables. For example i have export from EMP table "where emp_id > 1000" and in DEPT table "where dep_id in (10,20), could you please let me know how this is possible?

Answer 1

Hi,
The following example should help you figure out your specific case:
Rows Satisfying Some Condition
Suppose you want to create a subset of the table based on some criteria, e.g. “SALARY>10000”,
you would issue
$ expdp query=employees:"where salary>10000" tables=employees
This can also take the ORDER BY clause to create the dumpfile in a sorted order. Suppose you
want to dump the EMPLOYEES table order by SALARY, here is how the complete command looks
like (with the unix required escape characters – backslahes):
$ expdp arup/arup directory=demo_dir dumpfile=employees.dmp query=employees:\"where salary\>10000\ order by salary" tables=employees
If you already have a full dump, you may want to import from that instead of creating a subset of
the table in export. You can also use the QUERY parameter in impdp as well.
$ impdp QUERY=CUSTOMERS:“WHERE TOTAL_SPENT > 10"
This can also take the ORDER BY clause. This approach can be used to quickly load parts of the production table to test database. Please note that this does not take care of referential integrity constraints, i.e. the loaded rows do not necessarily satisfy all the foreign key relationships.  For instance, if you import 10% of the tables DEPARTMENTS and EMPLOYEES, there is no guarantee that all the department number of the employees in the 10% of the rows of the EMPLOYEES table will be in the 10% of the DEPARTMENTS table. So, the import will fail. In such a case, you can either disable the constraint (not a very useful option) or use the QUERY parameter to select specific rows.I recommend you read the following page (from which I took the above example):
http://www.rampant-books.com/art_nanda_datapump.htmHTH,
John.