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Don Burleson Blog 







expdp view_as_tables Tips

Oracle Tips by Burleson Consulting

January 3, 2013

Prior to release 12c, Oracle expdp sometime has to go through complex gyrations when exporting view information, and Oracle has overcome this limitation by introducing the view_as_tables argument to expdp. 

Invoked as "view_as_tables=scott.empview" the view_as_tables transforms a view at the source database into a table at the destination database, exporting all of the the columns of the view as-if they were table columns.

In a sense, the view_as_tables is an ad-hoc materialized view generator because the result set has been transformed from a view to a table.

In  a case where only a small portion of a complex view is exported with view_as_tables, all unnecessary details that maintain the complex view are omitted.

Note:  You cannot use expdp with the view_as_tables if you are choosing a LOB datatype column from the view.

Template tables are automatically dropped after the export operation is completed. While they exist, you can perform the following query to view their names (which all begin with KU$VAT):

   table_name like 'KU$VAT%'

For example, here we export a view called scott.myview using views_as_tables, naming it newtab1:

$ expdp xff/xifenfei views_as_tables=scott.myview:newtab1 directory=data_pump_dir dumpfile=xifenfei.dmp
Export: Release - Beta on Sun Dec 16 07:56:48 2015
Copyright (c) 1982, 2015, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 12c Enterprise Edition Release - 64bit Beta
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "XFF"."SYS_EXPORT_TABLE_01":xff/******** views_as_tables=v_xifenfei directory=data_pump_dir
Estimate in progress using BLOCKS method...
Total estimation using BLOCKS method: 16 KB
. . exported "XFF"."V_XIFENFEI" 7.390 KB 3 rows
Master table "XFF"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded


The view_as_tables allows you to specify a vie w as if it was a table and then make it into a table when using impdp:

$ impdp xff/xifenfei tables=v_xifenfei directory=data_pump_dir dumpfile=xifenfei.dmp
Import: Release - Beta on Sun Dec 16 07:59:05 2015
Copyright (c) 1982, 2015, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 12c Enterprise Edition Release - 64bit Beta
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "XFF"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "XFF"."SYS_IMPORT_TABLE_01": xff/******** tables=v_xifenfei directory=data_pump_dir
ORA-39325: TABLE_EXISTS_ACTION cannot be applied to "XFF"."V_XIFENFEI".
Job "XFF"."SYS_IMPORT_TABLE_01" completed with 1 error(s) at Sun Dec 16 07:59:13 2015 elapsed 0 00:00:05


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