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。