使用数据泵时LOB字段存放位置在哪
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在迁移过程中，我们很多时候通过数据泵方式迁移(expdp/impdp)，方便快捷，那么如果涉及到含有LOB字段的表呢，他们是怎么存放呢？
下面 我们就做一个简单的测试，测试环境，Oracle11.2.0.4， redhat6.7 x64
创建一个含有lob字段的表，如下：
点击(此处)折叠或打开
SQL> conn test/test
Connected.
SQL> Create table testlob (A number, B clob) LOB(b) STORE AS(TABLESPACE users); --注意，此处已指定表空间为USERS（当然，不建议使用USERS表空间，这里仅仅测试）
Table created.
SQL> insert into testlob select object_id,object_name from dba_objects where object_id is not null;
86387 rows created.
SQL> commit;
Commit complete.
查看一下相关信息, TESTLOB表对应的表空间为TEST 其lob字段所在表空间为USERS
点击(此处)折叠或打开
SQL> set lines 2000
SQL> col owner for a15
SQL> col table_name for a15
SQL> col column_name for a10
SQL> col segment_name for a15
SQL> col index_name for a15
SQL> select owner,table_name,column_name,segment_name,index_name,tablespace_name from dba_lobs where table_name='TESTLOB';
OWNER TABLE_NAME COLUMN_NAM SEGMENT_NAME INDEX_NAME TABLESPACE_NAME
--------------- --------------- ---------- --------------- --------------- ------------------------------
TEST TESTLOB B SYS_LOB00000880 SYS_IL000008802 USERS
26C00002$$ 6C00002$$
SQL>
SQL> select table_name,owner,tablespace_name from dba_tables where table_name='TESTLOB';
TABLE_NAME OWNER TABLESPACE_NAME
--------------- --------------- ------------------------------
TESTLOB TEST TEST
在当前库中创建一个新的表空间FIRSOULER，用户FIRSOULER
并执行导入导出操作
点击(此处)折叠或打开
oracle@mystandby dump]$ expdp test/test directory=sh_dmp DUMPFILE=testlob_ddl.dmp tables=testlob logfile=testlob.log content=METADATA_ONLY
Export: Release 11.2.0.4.0 - Production on Fri Sep 29 15:32:00 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "TEST"."SYS_EXPORT_TABLE_01": test/******** directory=sh_dmp DUMPFILE=testlob_ddl.dmp tables=testlob logfile=testlob.log content=METADATA_ONLY
Processing object type TABLE_EXPORT/TABLE/TABLE
Master table "TEST"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for TEST.SYS_EXPORT_TABLE_01 is:
/backup/dump/testlob_ddl.dmp
Job "TEST"."SYS_EXPORT_TABLE_01" successfully completed at Fri Sep 29 15:32:11 2017 elapsed 0 00:00:11
下面生成建表语句：
点击(此处)折叠或打开
[oracle@mystandby dump]$ impdp firsouler/abc directory=sh_dmp dumpfile=testlob.dmp sqlfile=testlob01.sql
Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:33:52 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded
Starting "FIRSOULER"."SYS_SQL_FILE_FULL_01": firsouler/******** directory=sh_dmp dumpfile=testlob.dmp sqlfile=testlob01.sql
Processing object type TABLE_EXPORT/TABLE/TABLE
Job "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully completed at Fri Sep 29 15:33:54 2017 elapsed 0 00:00:01
LOB 还是原来的表空间
点击(此处)折叠或打开
CREATE TABLE "TEST"."TESTLOB"
( "A" NUMBER,
"B" CLOB
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "TEST"
LOB ("B") STORE AS BASICFILE (
TABLESPACE "FIRSOULER" ENABLE STORAGE IN ROW CHUNK 8192
NOCACHE LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT))
下面再测试一下，lob使用默认表空间情况；
点击(此处)折叠或打开
SQL> conn test/test
Connected.
SQL>
SQL>
SQL> Create table testlob (A number, B clob) LOB(b) STORE AS(enable storage in row);
Table created.
SQL> insert into testlob select object_id,object_name from dba_objects where object_id is not null;
86390 rows created.
SQL> commit;
Commit complete.
SQL> set lines 2000
SQL> col owner for a15
SQL> col table_name for a15
SQL> col column_name for a10
SQL> col segment_name for a15
SQL> col index_name for a15
SQL> select owner,table_name,column_name,segment_name,index_name,tablespace_name from dba_lobs where table_name='TESTLOB';
OWNER TABLE_NAME COLUMN_NAM SEGMENT_NAME INDEX_NAME TABLESPACE_NAME
--------------- --------------- ---------- --------------- --------------- ------------------------------
TEST TESTLOB B SYS_LOB00000882 SYS_IL000008821 TEST
13C00002$$ 3C00002$$
SQL>
SQL> select table_name,owner,tablespace_name from dba_tables where table_name='TESTLOB';
TABLE_NAME OWNER TABLESPACE_NAME
--------------- --------------- ------------------------------
TESTLOB TEST TEST
查看建表语句，如下，在创建lob字段表时，如果默认，那么后续在迁移也会找当时的默认表空间：
点击(此处)折叠或打开
[oracle@mystandby dump]$ impdp firsouler/abc directory=sh_dmp dumpfile=testlob01.dmp sqlfile=testlob001.sql
Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:42:11 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded
Starting "FIRSOULER"."SYS_SQL_FILE_FULL_01": firsouler/******** directory=sh_dmp dumpfile=testlob01.dmp sqlfile=testlob001.sql
Processing object type TABLE_EXPORT/TABLE/TABLE
Job "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully completed at Fri Sep 29 15:42:13 2017 elapsed 0 00:00:01
[oracle@mystandby dump]$ cat testlob001.sql
-- CONNECT FIRSOULER
ALTER SESSION SET EVENTS '10150 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10904 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '25475 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10407 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10851 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '22830 TRACE NAME CONTEXT FOREVER, LEVEL 192 ';
-- new object type path: TABLE_EXPORT/TABLE/TABLE
CREATE TABLE "TEST"."TESTLOB"
( "A" NUMBER,
"B" CLOB
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "TEST"
LOB ("B") STORE AS BASICFILE (
TABLESPACE "TEST" ENABLE STORAGE IN ROW CHUNK 8192
NOCACHE LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)) ;
[oracle@mystandby dump]$
简单测试，提醒，在迁移过程中，一定确认lob字段所在表空间
下面是没有LOB字段所在表空间的情况
点击(此处)折叠或打开
[oracle@mystandby dump]$ impdp firsouler/abc directory=sh_dmp dumpfile=testlob01.dmp remap_tablespace=firsouler:test logfile=implob.log
Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:52:58 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORA-31626: job does not exist
ORA-31633: unable to create master table "FIRSOULER.SYS_IMPORT_FULL_05"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPV$FT", line 1038
ORA-00959: tablespace 'FIRSOULER' does not exist
那么改变表空间呢，通过expdp remap_tablespace 改变，lob也会改变。原来LOB 字段在USERS表空间中，表的表空间为TEST表空间
点击(此处)折叠或打开
[oracle@mystandby dump]$ impdp firsouler/abc directory=sh_dmp dumpfile=testlob01.dmp remap_schema=test:firsouler remap_tablespace=test:firsouler sqlfile=testlob001.sql
Import: Release 11.2.0.4.0 - Production on Fri Sep 29 16:04:23 2017
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded
Starting "FIRSOULER"."SYS_SQL_FILE_FULL_01": firsouler/******** directory=sh_dmp dumpfile=testlob01.dmp remap_schema=test:firsouler remap_tablespace=test:firsouler sqlfile=testlob001.sql
Processing object type TABLE_EXPORT/TABLE/TABLE
Job "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully completed at Fri Sep 29 16:04:25 2017 elapsed 0 00:00:01
[oracle@mystandby dump]$ cat testlob0
testlob001.sql testlob01.dmp
[oracle@mystandby dump]$ cat testlob001.sql
-- CONNECT FIRSOULER
ALTER SESSION SET EVENTS '10150 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10904 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '25475 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10407 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '10851 TRACE NAME CONTEXT FOREVER, LEVEL 1';
ALTER SESSION SET EVENTS '22830 TRACE NAME CONTEXT FOREVER, LEVEL 192 ';
-- new object type path: TABLE_EXPORT/TABLE/TABLE
CREATE TABLE "FIRSOULER"."TESTLOB"
( "A" NUMBER,
"B" CLOB
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "FIRSOULER"
LOB ("B") STORE AS BASICFILE (
TABLESPACE "FIRSOULER" ENABLE STORAGE IN ROW CHUNK 8192
NOCACHE LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT))
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