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Oracle selective export with conditional where clause

Oracle Database Tips by Donald Burleson

Question:  I need to create a scaled-down version of my production database for developers.  Can I use the export utility (exp and expdp) to restrict the rows that are dumped?

Answer:  Yes, you can add a where clause to your export syntax to extract a sub-set of your production rows.  In this example, we restrict the export to rows added in the last month:

exp scott/tiger tables=tab1, tab2 query="where mymonth > sysdate - 31"

You can generate syntax for all tables in your schema by building the export syntax with a query against user_tables.

Using the query Parameter to use WHERE Clause During Export

To export part of the data of a specific object, use the query parameter. In the following example, use the query parameter to get only one row from the tbl_two table and exclude table tbl_one:

query=test.tbl_two:"where id=1"
[oracle@localhost tmp]$ expdp test/test parfile=/tmp/test.par
. . exported "test"."tbl_two"                     4.914 KB       1 rows

To use different restrictions, you can use more than one query parameter in the same parameter file.


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