11g Oracle Export Table default does not export data to null table resolution

11g Oracle Export table will default to no export data is empty

1, oracle11g default to Empty table is not assigned segment, so use EXP export oracle11g database, empty table is not exported.
2. After setting the Deferred_segment_creation parameter to False, both the empty table and the non-empty table are assigned segment.
In Sqlplus, execute the following command:
Sql>alter system set Deferred_segment_creation=false; View:
Sql>show parameter deferred_segment_creation;
This value is set only after the newly added table, which has no effect on the previously established empty table.

Solution:

1. Find the empty table with the following sentence and generate the execution command
Select ' ALTER TABLE ' | | table_name| | ' allocate extent; ' from User_tables where num_rows=0;

2. Export the contents of the query results and execute the exported statement.

3. Then export the database in exp mode, and the database with empty table can be exported completely.