Oracle 11G uses EXP to export empty table problem resolution

There is a new feature in ORACLE 11G that does not allocate segment when the table has no data to save space.

The parameter value is true by default, and segment is assigned when false, whether it is an empty table or a non-empty table.
It is important to note that this value is set to no effect on previously imported empty tables, and still cannot be exported, but can only work on the new tables that are created later.
Querying empty tables that have been created before
Select ' ALTER TABLE ' | | table_name| | ' allocate extent; ' from User_tables where num_rows=0
Export the query results and execute the exported statement
' ALTER TABLE ' | | table_name| | ' ALLOCATE EXTENT; '
If the table is small, you can insert a row in the empty table and then delete, so that the database table will be allocated segment ...

Oracle 11G uses EXP to export empty table problem resolution