Is there a self-cleaning of the TABLEs not referenced after surgery impdp?

Assume the following sequence of operations:

(1.) I export a complete database with expdp in a dumpfile
2.) I create a new TABLE "mytab" (resp. more generally a object). References/entries in this table will be added to a couple of tables system "all_tables", "dba_tab_privs" and others.
3.) now I import the previously exported dumpfile to return in the original database with parameter
TABLE_EXISTS_ACTION = REPLACE FULL = Y

This operation would replace the table "all_tables' (resp. the table behind this point of view system).
The reference to "mytab" is getting lost. This is similar to an object that is not referenced in C++ (which must be released) or an object not referenced in Java that is removed by the garbage collector.

How such an orphaned table/object is managed in Oracle?

Is there a!-up or a warning?

Peter

If you create a table after you export and an import complete export the table you created after that export has been carried out, mytable in your example, should not be affected by import. RDBMS database tables are not superimposed my full import rather the DDL created as part of the export updates base tables.

Where the table exists the create table in dmp file errors out and impdp (or imp) just ignores the error and continues to stage data loading. The stage of loading data capture and does not take into account continuous duplicate key errors to try to insert data until there is no more to this table, then he goes to try to create the index for the table.

At least that's how exp/imp has worked and I have not noticed any behavior change with expdp/impdp, although I haven't used utilities heavily again.

HTH - Mark D Powell.

Note: the above applies when you import in the db of the source, and not another where you expect changes once the dmp file was made to not be present in the default behavior for a full import to do not destroy the existing database and re-create dmp file. To re-create the tablespaces was the default behavior with version 6.

Edited by: Mark D Powell on March 18, 2010 06:20

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