exp/imp是大家在数据库迁移中最常见的工具,但是该工具对于表空间的转换不是很智能(最少没有datapump方便),使得很多人在导入数据的时候,吃够了表空间不存在的苦.这里有个细节:fromuser和touser在哪些情况下会失效.这里通过试验,简单证明了对于常见的lob对象和分区表对象的时候fromuser和touser修改表空间会失效.
exp/imp支持表空间变化
--创建测试用户 SQL> create user chf identified by xifenfei; User created. SQL> grant dba to chf; Grant succeeded. SQL> conn chf/xifenfei Connected. --创建测试对象 SQL> create table t_xifenfei01 tablespace users 2 as 3 select * from dba_objects; Table created. SQL> create index in_t_xifenfei01 on t_xifenfei01(object_id) tablespace xifenfei; Index created. SQL> create table t_xifenfei02 tablespace xifenfei 2 as 3 select * from dba_objects; Table created. SQL> create index in_t_xifenfei02 on t_xifenfei02(object_id) tablespace users; Index created. --查询测试对象分布表空间情况 SQL> select OWNER,table_name,TABLESPACE_NAME from dba_tables where table_name like 'T_XIFENFEI%'; OWNER TABLE_NAME TABLESPACE_NAME ------------------------------ ------------------------------ ------------------------------ CHF T_XIFENFEI01 USERS CHF T_XIFENFEI02 XIFENFEI SQL> SELECT OWNER,INDEX_NAME,TABLESPACE_NAME FROM DBA_INDEXES WHERE INDEX_NAME LIKE 'IN_T_XIFENFEI%'; OWNER INDEX_NAME TABLESPACE_NAME ------------------------------ ------------------------------ ------------------------------ CHF IN_T_XIFENFEI01 XIFENFEI CHF IN_T_XIFENFEI02 USERS --导出测试对象 [oracle@xifenfei ~]$ exp chf/xifenfei tables=t_xifenfei01,t_xifenfei02 file=/tmp/xifenfei.dmp log=/tmp/xifenfei.log Export: Release 10.2.0.4.0 - Production on Thu Dec 15 07:33:27 2011 Copyright (c) 1982, 2007, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set About to export specified tables via Conventional Path ... . . exporting table T_XIFENFEI01 50053 rows exported . . exporting table T_XIFENFEI02 50055 rows exported Export terminated successfully without warnings. --为了试验证实,离线该表涉及表空间 SQL> alter tablespace xifenfei read only; Tablespace altered. SQL> alter tablespace users read only; Tablespace altered. --创建新用户 SQL> create user chf1 identified by xifenfei; User created. SQL> grant dba to chf1; Grant succeeded. --创建新表空间 SQL> create tablespace xifenfei1 datafile '/u01/oracle/oradata/XFF/xifenfei02.dbf' size 10m autoextend on 2 next 10m maxsize 10g; Tablespace created. SQL> alter user chf1 default tablespace xifenfei1; User altered. --两个测试用户分别默认表空间 SQL> select username,default_tablespace from dba_users where username like 'CHF%'; USERNAME DEFAULT_TABLESPACE ------------------------------ ------------------------------ CHF USERS CHF1 XIFENFEI1 --导入测试数据 [oracle@xifenfei ~]$ imp chf1/xifenfei fromuser=chf touser=chf1 file=/tmp/xifenfei.dmp log=/tmp/xifenfei.log Import: Release 10.2.0.4.0 - Production on Thu Dec 15 07:37:54 2011 Copyright (c) 1982, 2007, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Export file created by EXPORT:V10.02.01 via conventional path Warning: the objects were exported by CHF, not by you import done in ZHS16GBK character set and AL16UTF16 NCHAR character set . importing CHF's objects into CHF1 . . importing table "T_XIFENFEI01" 50053 rows imported . . importing table "T_XIFENFEI02" 50055 rows imported Import terminated successfully without warnings. --查询导入结果 SQL> SELECT OWNER,INDEX_NAME,TABLESPACE_NAME FROM DBA_INDEXES WHERE INDEX_NAME LIKE 'IN_T_XIFENFEI%' 2 and owner='CHF1'; OWNER INDEX_NAME TABLESPACE_NAME ------------------------------ ------------------------------ ------------------------------ CHF1 IN_T_XIFENFEI01 XIFENFEI1 CHF1 IN_T_XIFENFEI02 XIFENFEI1 SQL> select OWNER,table_name,TABLESPACE_NAME from dba_tables where table_name like 'T_XIFENFEI%' 2 AND OWNER='CHF1'; OWNER TABLE_NAME TABLESPACE_NAME ------------------------------ ------------------------------ ------------------------------ CHF1 T_XIFENFEI01 XIFENFEI1 CHF1 T_XIFENFEI02 XIFENFEI1
通过这里的试验证明:对于无lob对象的普通表和普通index使用fromuser和touser可以实现表空间完美变化
含LOB对象测试
--read write相关表空间
SQL> alter tablespace users read write;
Tablespace altered.
SQL> alter tablespace xifenfei read write;
Tablespace altered.
SQL> create tablespace xifenfei2 datafile '/u01/oracle/oradata/XFF/xifenfei03.dbf' size 10m;
Tablespace created.
SQL> conn chf/xifenfei
Connected.
--创建表,lob分别属于不同空间(数据导入到另外表空间)
SQL> create table t_lob
2 (id number,clob1 clob,blob1 blob) tablespace users
3 LOB ("CLOB1") STORE AS ( TABLESPACE xifenfei)
4 LOB ("BLOB1") STORE AS ( TABLESPACE xifenfei1 );
Table created.
SQL> select table_name,COLUMN_NAME,TABLESPACE_NAME from user_lobs;
TABLE_NAME COLUMN_NAME TABLESPACE_NAME
------------------------------ --------------- ------------------------------
T_LOB CLOB1 XIFENFEI
T_LOB BLOB1 XIFENFEI1
SQL> select tablespace_name from user_tables where table_name='T_LOB';
TABLESPACE_NAME
------------------------------
USERS
--创建表和lob属于一个表空间(数据导入到另外表空间)
SQL> create table t_lob_n
2 (id number,clob1 clob) tablespace users;
Table created.
SQL> select segment_name,segment_type,tablespace_name from user_segments where SEGMENT_NAME not like '%XIFENFEI%';
SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME
--------------------------------------------------------------------------------- ------------------ ----------------
SYS_IL0000051858C00002$$ LOBINDEX USERS
SYS_LOB0000051858C00002$$ LOBSEGMENT USERS
T_LOB_N TABLE USERS
T_LOB TABLE USERS
SYS_IL0000051851C00002$$ LOBINDEX XIFENFEI
SYS_LOB0000051851C00002$$ LOBSEGMENT XIFENFEI
SYS_IL0000051851C00003$$ LOBINDEX XIFENFEI1
SYS_LOB0000051851C00003$$ LOBSEGMENT XIFENFEI1
--表和lob不同表空间(数据导入到lob对应表空间)
SQL> create table t_lob2
2 (id number,clob1 clob) tablespace users
3 LOB ("CLOB1") STORE AS ( TABLESPACE xifenfei2);
Table created.
SQL> select table_name,COLUMN_NAME,TABLESPACE_NAME from user_lobs;
TABLE_NAME COLUMN_NAME TABLESPACE_NAME
------------------------------ --------------- ------------------------------
T_LOB_N CLOB1 USERS
T_LOB CLOB1 XIFENFEI
T_LOB BLOB1 XIFENFEI1
T_LOB2 CLOB1 XIFENFEI2
SQL> select segment_name,segment_type,tablespace_name from user_segments where SEGMENT_NAME not like '%XIFENFEI%';
SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME
------------------------------ ------------------ ------------------------------
T_LOB2 TABLE USERS
SYS_IL0000051858C00002$$ LOBINDEX USERS
SYS_LOB0000051858C00002$$ LOBSEGMENT USERS
T_LOB_N TABLE USERS
T_LOB TABLE USERS
SYS_IL0000051851C00002$$ LOBINDEX XIFENFEI
SYS_LOB0000051851C00002$$ LOBSEGMENT XIFENFEI
SYS_IL0000051851C00003$$ LOBINDEX XIFENFEI1
SYS_LOB0000051851C00003$$ LOBSEGMENT XIFENFEI1
SYS_IL0000051863C00002$$ LOBINDEX XIFENFEI2
SYS_LOB0000051863C00002$$ LOBSEGMENT XIFENFEI2
11 rows selected.
SQL> select table_name,COLUMN_NAME,TABLESPACE_NAME,SEGMENT_NAME from user_lobs;
TABLE_NAME COLUMN_NAME TABLESPACE_NAME SEGMENT_NAME
------------------------------ --------------- ------------------------------ ------------------------------
T_LOB BLOB1 XIFENFEI1 SYS_LOB0000051851C00003$$
T_LOB CLOB1 XIFENFEI SYS_LOB0000051851C00002$$
T_LOB_N CLOB1 USERS SYS_LOB0000051858C00002$$
T_LOB2 CLOB1 XIFENFEI2 SYS_LOB0000051863C00002$$
--得到在默认情况下LOBINDEX和LOBSEGMENT在同一个表空间
--导出三种情况下lob表
[oracle@xifenfei ~]$ exp chf/xifenfei tables=t_lob_n file=/tmp/lob1.dmp log=/tmp/xifenfei.log indexes=y
Export: Release 10.2.0.4.0 - Production on Thu Dec 15 08:57:38 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table T_LOB_N 0 rows exported
Export terminated successfully without warnings.
[oracle@xifenfei ~]$ exp chf/xifenfei tables=t_lob file=/tmp/lob.dmp log=/tmp/xifenfei.log indexes=y
Export: Release 10.2.0.4.0 - Production on Thu Dec 15 08:31:25 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table T_LOB 0 rows exported
Export terminated successfully without warnings.
[oracle@xifenfei ~]$ exp chf/xifenfei tables=t_lob2 file=/tmp/lob2.dmp log=/tmp/xifenfei.log
Export: Release 10.2.0.4.0 - Production on Thu Dec 15 16:23:18 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table T_LOB2 0 rows exported
Export terminated successfully without warnings.
--修改default tablespace 和 read only相关表空间
SQL> alter user chf1 default tablespace xifenfei2;
User altered.
SQL> alter tablespace users read only;
Tablespace altered.
SQL> alter tablespace xifenfei read only;
Tablespace altered.
SQL> alter tablespace xifenfei1 read only;
Tablespace altered.
--导入lob表
[oracle@xifenfei ~]$ imp chf1/xifenfei tables=t_lob_n file=/tmp/lob1.dmp log=/tmp/xifenfei.log fromuser=chf touser=chf1
Import: Release 10.2.0.4.0 - Production on Thu Dec 15 08:58:12 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
Warning: the objects were exported by CHF, not by you
import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
. importing CHF's objects into CHF1
IMP-00017: following statement failed with ORACLE error 1647:
"CREATE TABLE "T_LOB_N" ("ID" NUMBER, "CLOB1" CLOB) PCTFREE 10 PCTUSED 40 I"
"NITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 "
"BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS LOB ("CLOB1") ST"
"ORE AS (TABLESPACE "USERS" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION NOCA"
"CHE LOGGING STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POO"
"L DEFAULT))"
IMP-00003: ORACLE error 1647 encountered
ORA-01647: tablespace 'USERS' is read only, cannot allocate space in it
Import terminated successfully with warnings.
--使用fromuser和touser并未修改table segment初始化参数
[oracle@xifenfei ~]$ imp chf1/xifenfei tables=t_lob file=/tmp/lob.dmp log=/tmp/xifenfei.log fromuser=chf touser=chf1
Import: Release 10.2.0.4.0 - Production on Thu Dec 15 08:35:05 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
Warning: the objects were exported by CHF, not by you
import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
. importing CHF's objects into CHF1
IMP-00017: following statement failed with ORACLE error 1647:
"CREATE TABLE "T_LOB" ("ID" NUMBER, "CLOB1" CLOB, "BLOB1" BLOB) PCTFREE 10 "
"PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELI"
"ST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS LOB "
"("CLOB1") STORE AS (TABLESPACE "XIFENFEI" ENABLE STORAGE IN ROW CHUNK 8192"
" RETENTION NOCACHE LOGGING STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROU"
"PS 1 BUFFER_POOL DEFAULT)) LOB ("BLOB1") STORE AS (TABLESPACE "XIFENFEI1" "
"ENABLE STORAGE IN ROW CHUNK 8192 RETENTION NOCACHE LOGGING STORAGE(INITIAL"
" 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT))"
IMP-00003: ORACLE error 1647 encountered
ORA-01647: tablespace 'USERS' is read only, cannot allocate space in it
Import terminated successfully with warnings.
--结论同上
[oracle@xifenfei ~]$ imp chf1/xifenfei tables=t_lob2 file=/tmp/lob2.dmp log=/tmp/xifenfei.log fromuser=chf touser=chf1
Import: Release 10.2.0.4.0 - Production on Thu Dec 15 16:24:03 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
Warning: the objects were exported by CHF, not by you
import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
. importing CHF's objects into CHF1
IMP-00017: following statement failed with ORACLE error 1647:
"CREATE TABLE "T_LOB2" ("ID" NUMBER, "CLOB1" CLOB) PCTFREE 10 PCTUSED 40 IN"
"ITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 B"
"UFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS LOB ("CLOB1") STO"
"RE AS (TABLESPACE "XIFENFEI2" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION N"
"OCACHE LOGGING STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 BUFFER_"
"POOL DEFAULT))"
IMP-00003: ORACLE error 1647 encountered
ORA-01647: tablespace 'USERS' is read only, cannot allocate space in it
Import terminated successfully with warnings.
--结论也同上
通过三种不同情况的table segment 和lob segment的分别表空间和导入表空间测试情况,可以判断出来在使用exp/imp迁移数据时候,如果遇到含lob字段表,不能通过fromuser和touser来实现修改,就算lob的表空间存在,或者lob和table segment是同一个表空间,而table segment的表空间不存在,依然会报错,导入不成功.
分区表测试
--read write 相关表空间
SQL> alter tablespace users read write;
Tablespace altered.
SQL> alter tablespace xifenfei read write;
Tablespace altered.
SQL> alter tablespace xifenfei1 read write;
Tablespace altered.
--创建分区表
SQL> conn chf/xifenfei
Connected.
SQL> create table tab_par
2 (
3 F_KJND VARCHAR2(4) default ' ' not null,
4 F_CODE VARCHAR2(30) default ' ' not null,
5 F_KMBH VARCHAR2(30) default ' ' not null,
6 F_BKBH VARCHAR2(30) default ' ' not null,
7 UNIT_ID VARCHAR2(30)
8 )
9 partition by range (F_KJND)
10 (partition TABL_NAME_PT_2009 values less than ('2010')tablespace users,
11 partition TABL_NAME_PT_2010 values less than ('2011')tablespace xifenfei,
12 partition TABL_NAME_PT_MAX values less than (MAXVALUE) tablespace xifenfei1
13 );
Table created.
--查询分区分布
SQL> select PARTITION_NAME,TABLESPACE_NAME from ALL_TAB_PARTITIONS where TABLE_NAME='TAB_PAR';
PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------
TABL_NAME_PT_2009 USERS
TABL_NAME_PT_2010 XIFENFEI
TABL_NAME_PT_MAX XIFENFEI1
--导出分区表
[oracle@xifenfei ~]$ exp chf/xifenfei tables=tab_par file=/tmp/tab_par.dmp log=/tmp/xifenfei.log
Export: Release 10.2.0.4.0 - Production on Thu Dec 15 18:33:19 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table TAB_PAR
. . exporting partition TABL_NAME_PT_2009 0 rows exported
. . exporting partition TABL_NAME_PT_2010 0 rows exported
. . exporting partition TABL_NAME_PT_MAX 0 rows exported
Export terminated successfully without warnings.
--导入分区表
[oracle@xifenfei ~]$ imp chf1/xifenfei tables=tab_par file=/tmp/tab_par.dmp log=/tmp/xifenfei.log fromuser=chf touser=chf1
Import: Release 10.2.0.4.0 - Production on Thu Dec 15 18:33:52 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
Warning: the objects were exported by CHF, not by you
import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
. importing CHF's objects into CHF1
. . importing partition "TAB_PAR":"TABL_NAME_PT_2009" 0 rows imported
. . importing partition "TAB_PAR":"TABL_NAME_PT_2010" 0 rows imported
. . importing partition "TAB_PAR":"TABL_NAME_PT_MAX" 0 rows imported
Import terminated successfully without warnings.
--导入成功
--查看导入进入表空间
SQL> select PARTITION_NAME,TABLESPACE_NAME from ALL_TAB_PARTITIONS where TABLE_NAME='TAB_PAR' and TABLE_OWNER='CHF1';
PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------
TABL_NAME_PT_2009 USERS
TABL_NAME_PT_2010 XIFENFEI
TABL_NAME_PT_MAX XIFENFEI1
--发现还是进入和以前相同的表空间,fromuser和touser未生效
SQL> DROP TABLE CHF1.TAB_PAR PURGE;
Table dropped.
--read only相关表空间测试
SQL> ALTER TABLESPACE USERS READ ONLY;
Tablespace altered.
SQL> ALTER TABLESPACE XIFENFEI READ ONLY;
Tablespace altered.
SQL> ALTER TABLESPACE XIFENFEI1 READ ONLY;
Tablespace altered.
--再次导入
[oracle@xifenfei ~]$ imp chf1/xifenfei tables=tab_par file=/tmp/tab_par.dmp log=/tmp/xifenfei.log fromuser=chf touser=chf1
Import: Release 10.2.0.4.0 - Production on Thu Dec 15 18:36:38 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
Warning: the objects were exported by CHF, not by you
import done in ZHS16GBK character set and AL16UTF16 NCHAR character set
. importing CHF's objects into CHF1
IMP-00017: following statement failed with ORACLE error 1647:
"CREATE TABLE "TAB_PAR" ("F_KJND" VARCHAR2(4) NOT NULL ENABLE, "F_CODE" VARC"
"HAR2(30) NOT NULL ENABLE, "F_KMBH" VARCHAR2(30) NOT NULL ENABLE, "F_BKBH" V"
"ARCHAR2(30) NOT NULL ENABLE, "UNIT_ID" VARCHAR2(30)) PCTFREE 10 PCTUSED 40"
" INITRANS 1 MAXTRANS 255 TABLESPACE "USERS" LOGGING PARTITION BY RANGE ("F_"
"KJND" ) (PARTITION "TABL_NAME_PT_2009" VALUES LESS THAN ('2010') PCTFREE "
"10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FRE"
"ELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS, "
"PARTITION "TABL_NAME_PT_2010" VALUES LESS THAN ('2011') PCTFREE 10 PCTUSED"
" 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROU"
"PS 1 BUFFER_POOL DEFAULT) TABLESPACE "XIFENFEI" LOGGING NOCOMPRESS, PARTITI"
"ON "TABL_NAME_PT_MAX" VALUES LESS THAN (MAXVALUE) PCTFREE 10 PCTUSED 40 IN"
"ITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST GROUPS 1 B"
"UFFER_POOL DEFAULT) TABLESPACE "XIFENFEI1" LOGGING NOCOMPRESS )"
IMP-00003: ORACLE error 1647 encountered
ORA-01647: tablespace 'USERS' is read only, cannot allocate space in it
Import terminated successfully with warnings.
--进步一证明分区表在导入的时候fromuser和touser未能改变其对应表空间
通过对分区表的测试,证明exp/imp在操作分区表的时候fromuser和touser也不能实现表空间的转换
在使用imp和exp实现数据迁移的时候,遇到我们常见的lob和分区表时候fromuser和touser修改表空间会失效,数据还是会导入到原对象锁对应的表空间,所以在处理含这些对象的数据迁移时,一般方法有:1.创建好这些对象所属表空间;2.先导出来这些对象对应的创建脚本,创建好这些对象,然后使用IGNORE=Y导入
