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Import selected rows

Oracle Database Tips by Donald Burleson

Question:  I have an export dmp file and I only want to import specific rows.  I noted that exp has a "query=" clause but I wonder if there is any way to import only limited amount of rows from an export file.

Answer:  Yes, Oracle supports the "query=" clause for import (impdp), but you can restrict rows with the impdp with the query= option. This allows the filtering of data that is imported by applying a query to SELECT statements executed on the source system.  Also see import (impdp) with where clause Tips

Import Data Subsets

This is probably the most powerful and useful aspect of the data import process, and yet it remains highly underutilized. Say that one wants to load data from a table while using a filter upon the rows being inserted. That is easily accomplished via a normal SELECT command's WHERE clause placed in the query parameter passed to the import process. So, as done before, one could easily import only those customers who live in Texas as follows:

C:\> impdp bert/bert directory=data_pump_dir dumpfile=all_of_movies.dmp schemas=movies query=movies.customer:\"where state='TX'\"

That seems easy enough, but there is a small catch. The QUERY clause is applied to all the tables in the import set, so all the tables better have the columns referenced by that WHERE clause. A common example would be a schema table design where each table contains a last modified date column. If only records in that schema which had been modified within the past three months should be loaded, here is the data pump export command for that:

C:\> impdp bert/bert directory=data_pump_dir dumpfile=all_of_movies.dmp schemas=movies query=\"where last_mod_date is not null and last_mod_date > SYSDATE-90\"

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