How can I export an Oracle 11g empty table using the exp command?

Recently, Oracle 11g exp command was used to back up the database and restore the database. It was found that the table that has never inserted data before the export was not exported. Similar problems have not been found before when I was using 9i and 10g, but it was actually a pitfall. google found a new feature in 11G. When the table has no data, no segment is assigned to save space. To export empty tables as well, the following processing is required:

1) use the following statement to find an empty table:

Select 'alter table' | table_name | 'allocate extent; 'from user_tables where segment_created = 'no ';

Export the query result and execute the exported statement.

2) then use the exp command to export the database.