1.先进行表分析(一定要执行此步，否则查询空表可能不准确)

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

2.再查询哪些表是空的(此步可以省略,直接进行第三步)

select table_name from user_tables where NUM_ROWS=0 order by table_name;

3.最后生成alert语句
select ‘alter table ‘||table_name||‘ allocate extent;‘ from user_tables where num_rows=0 order by table_name;

oracle导不出空表的解决办法