You can not export empty table when oracle11g export dmp file, resulting in lack of table

I. Executive

select 'analyze table '||table_name||' compute statistics;' from user_tables;

The query result to the query the paste inside sql plsql performed again in the inside (the result of a query sql statement are executed again, the query object to empty tables)

Second, the implementation of

select 'alter table '||table_name||' allocate extent;' from user_tables where num_rows=0；

The query results of a query to paste the sql which also performs again in plsql inside

 

These two steps are completed can export operations after the empty table