show parameter deferred_segment_creation NAME                                 TYPE        VALUE ------------------------------------ ----------- ---------- deferred_segment_creation            boolean     TRUE SQL> alter system set deferred_segment_creation=false; 系统已更改。 SQL> show parameter deferred_segment_creation NAME                                 TYPE        VALUE ------------------------------------ ----------- ---------- deferred_segment_creation            boolean     FALSE 该参数值默认是TRUE，当改为FALSE时，无论是空表还是非空表，都分配segment。 需注意的是：该值设置后对以前导入的空表不产生作用，仍不能导出，只能对后面新增的表产生作用。如需导出之前的空表，只能用第一种方法。 

select table_name from user_tables where NUM_ROWS=0; 

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

ALTERTABLE'||TABLE_NAME||'ALLOCATEEXTENT;' ----------------------------------------------------------- alter table AQ$_AQ$_MEM_MC_H allocate extent; alter table AQ$_AQ$_MEM_MC_G allocate extent; alter table AQ$_AQ$_MEM_MC_I allocate extent; alter table AQ$_AQ_PROP_TABLE_T allocate extent; alter table AQ$_AQ_PROP_TABLE_H allocate extent; alter table AQ$_AQ_PROP_TABLE_G allocate extent; alter table AQ$_AQ_PROP_TABLE_I allocate extent; alter table AQ$_KUPC$DATAPUMP_QUETAB_T allocate extent; alter table AQ$_KUPC$DATAPUMP_QUETAB_H allocate extent; alter table AQ$_KUPC$DATAPUMP_QUETAB_G allocate extent; alter table AQ$_KUPC$DATAPUMP_QUETAB_I allocate extent; 

create directory expdp_dir as '/data/db';
grant read,write on directory expdp_dir to DRGN_OWNER;expdp DRGN_OWNER/DRGN_OWNER DIRECTORY=expdp_dir DUMPFILE=dbfile.dmp SCHEMAS=DRGN_OWNER logfile=DRGN_OWNERexpdp.logcreate directory impdp_dir as '/data/db';
grant read,write on directory impdp_dir to DRGN_OWNER;impdp DRGN_OWNER/DRGN_OWNER DIRECTORY=impdp_dir DUMPFILE=dbfile.dmp logfile=DRGN_OWNER.dmpimpdp.log

alter system set deferred_segment_creation=flase sscope=spfile;
shutdowm immediate
startup