一、
exp userid=bx81/bx81 owner=bx81;
imp userid=bx81/bx81 full=y indexfile=bx8.sql;
注意着时imp并没有真正写入数据库，而是将DDL写在bx8.sql里。
二、用下面的脚本可以生成某个用户下的表的DDL语句：
set arraysize 1
set echo off
set heading off
set feedback off
set verify off
set pagesize 0
set linesize 79
define 1 = &&SCHEMA_NAME
spool tbl_&&SCHEMA_NAME
set termout off
col x noprint
col y noprint
select 'rem **** Create Table DDL for '||chr(10)||
'rem **** '||username||''''||'s tables'||chr(10)||chr(10)
from dba_users
where username = upper ('&&1')
/
select table_name y,
0 x,
'create table ' ||
rtrim(table_name) ||
'('
from dba_tables
where owner = upper('&&1')
union
select tc.table_name y,
column_id x,
rtrim(decode(column_id,1,null,','))||
rtrim(column_name)|| ' ' ||
rtrim(data_type) ||
rtrim(decode(data_type,'DATE',null,'LONG',null,
'NUMBER',decode(to_char(data_precision),null,null,'('),
'(')) ||
rtrim(decode(data_type,
'DATE',null,
'CHAR',data_length,
'VARCHAR2',data_length,
'NUMBER',decode(to_char(data_precision),null,null,
to_char(data_precision) || ',' || to_char(data_scale)),
'LONG',null,
'******ERROR')) ||
rtrim(decode(data_type,'DATE',null,'LONG',null,
'NUMBER',decode(to_char(data_precision),null,null,')'),
')')) || ' ' ||
rtrim(decode(nullable,'N','NOT NULL',null))
from dba_tab_columns tc,
dba_objects o
where o.owner = tc.owner
and o.object_name = tc.table_name
and o.object_type = 'TABLE'
and o.owner = upper('&&1')
union
select table_name y,
999999 x,
')' || chr(10)
||' STORAGE(' || chr(10)
||' INITIAL ' || initial_extent || chr(10)
||' NEXT ' || next_extent || chr(10)
||' MINEXTENTS ' || min_extents || chr(10)
||' MAXEXTENTS ' || max_extents || chr(10)
||' PCTINCREASE '|| pct_increase || ')' ||chr(10)
||' INITRANS ' || ini_trans || chr(10)
||' MAXTRANS ' || max_trans || chr(10)
||' PCTFREE ' || pct_free || chr(10)
||' PCTUSED ' || pct_used || chr(10)
||' PARALLEL (DEGREE ' || DEGREE || ') ' || chr(10)
||' TABLESPACE ' || rtrim(tablespace_name) ||chr(10)
||'/'||chr(10)||chr(10)
from dba_tables
where owner = upper('&&1')
order by 1,2
/
三、
使用第三方的工具，如TOAD，会便利一些。