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使用数据泵时LOB字段存放位置在哪

这篇文章将为大家详细讲解有关使用数据泵时LOB字段存放位置在哪，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

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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

  1. SQL> conn test/test

  2. Connected.

  3. 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 ）

  5. Table created.

  7. SQL> insert into testlob select object_id,object_name from dba_objects where object_id is not null;

  9. 86387 rows created.

  11. SQL> commit;

  13. 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

  1. SQL> set lines 2000

  2. SQL> col owner for a15

  3. SQL> col table_name for a15

  4. SQL> col column_name for a10

  5. SQL> col segment_name for a15

  6. SQL> col index_name for a15

  7. SQL> select owner,table_name,column_name,segment_name,index_name,tablespace_name from dba_lobs where table_name='TESTLOB';

  9. OWNER           TABLE_NAME      COLUMN_NAM SEGMENT_NAME    INDEX_NAME      TABLESPACE_NAME

  10. --------------- --------------- ---------- --------------- --------------- ------------------------------

  11. TEST TESTLOB         B          SYS_LOB00000880 SYS_IL000008802 USERS

  12.                                            26C00002$$      6C00002$$

  15. SQL>

  16. SQL> select table_name,owner,tablespace_name from dba_tables where table_name='TESTLOB';

  18. TABLE_NAME      OWNER           TABLESPACE_NAME

  19. --------------- --------------- ------------------------------

  20. 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

  1. oracle@mystandby dump]$ expdp test/test directory=sh_dmp DUMPFILE=testlob_ddl.dmp tables=testlob logfile=testlob.log content=METADATA_ONLY

  3. Export: Release 11.2.0.4.0 - Production on Fri Sep 29 15:32:00 2017

  5. Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

  7. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

  8. With the Partitioning, OLAP, Data Mining and Real Application Testing options

  9. Starting "TEST"."SYS_EXPORT_TABLE_01": test/******** directory=sh_dmp DUMPFILE=testlob_ddl.dmp tables=testlob logfile=testlob.log content=METADATA_ONLY

  10. Processing object type TABLE_EXPORT/TABLE/TABLE

  11. Master table "TEST"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded

  12. ******************************************************************************

  13. Dump file set for TEST.SYS_EXPORT_TABLE_01 is:

  14.   /backup/dump/testlob_ddl.dmp

  15. 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

  1. [oracle@mystandby dump]$ impdp firsouler/abc  directory=sh_dmp dumpfile=testlob.dmp sqlfile=testlob01.sql

  3. Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:33:52 2017

  5. Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

  7. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

  8. With the Partitioning, OLAP, Data Mining and Real Application Testing options

  9. Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded

  10. Starting "FIRSOULER"."SYS_SQL_FILE_FULL_01": firsouler/******** directory=sh_dmp dumpfile=testlob.dmp sqlfile=testlob01.sql

  11. Processing object type TABLE_EXPORT/TABLE/TABLE

  12. 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

  1. CREATE TABLE "TEST"."TESTLOB"

  2.    ( "A" NUMBER,

  3.         "B" CLOB

  4.    ) SEGMENT CREATION IMMEDIATE

  5.   PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255

  6.  NOCOMPRESS LOGGING

  7.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  8.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  9.   BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)

  10.   TABLESPACE "TEST"

  11.  LOB ("B") STORE AS BASICFILE (

  12.   TABLESPACE "FIRSOULER" ENABLE STORAGE IN ROW CHUNK 8192

  13.   NOCACHE LOGGING

  14.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  15.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  16.   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

  1. SQL> conn test/test

  2. Connected.

  3. SQL>

  4. SQL>

  5. SQL> Create table testlob (A number, B clob) LOB(b) STORE AS(enable storage in row);

  7. Table created.

  9. SQL> insert into testlob select object_id,object_name from dba_objects where object_id is not null;

  11. 86390 rows created.

  13. SQL> commit;

  15. Commit complete.

  17. SQL> set lines 2000

  18. SQL> col owner for a15

  19. SQL> col table_name for a15

  20. SQL> col column_name for a10

  21. SQL> col segment_name for a15

  22. SQL> col index_name for a15

  23. SQL> select owner,table_name,column_name,segment_name,index_name,tablespace_name from dba_lobs where table_name='TESTLOB';

  25. OWNER           TABLE_NAME      COLUMN_NAM SEGMENT_NAME    INDEX_NAME      TABLESPACE_NAME

  26. --------------- --------------- ---------- --------------- --------------- ------------------------------

  27. TEST TESTLOB         B          SYS_LOB00000882 SYS_IL000008821 TEST

  28.                                            13C00002$$      3C00002$$

  31. SQL>

  32. SQL> select table_name,owner,tablespace_name from dba_tables where table_name='TESTLOB';

  34. TABLE_NAME      OWNER           TABLESPACE_NAME

  35. --------------- --------------- ------------------------------

  36. 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

  1. [oracle@mystandby dump]$ impdp firsouler/abc  directory=sh_dmp dumpfile=testlob01.dmp sqlfile=testlob001.sql

  3. Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:42:11 2017

  5. Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

  7. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

  8. With the Partitioning, OLAP, Data Mining and Real Application Testing options

  9. Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded

  10. Starting "FIRSOULER"."SYS_SQL_FILE_FULL_01": firsouler/******** directory=sh_dmp dumpfile=testlob01.dmp sqlfile=testlob001.sql

  11. Processing object type TABLE_EXPORT/TABLE/TABLE

  12. Job "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully completed at Fri Sep 29 15:42:13 2017 elapsed 0 00:00:01

  14. [oracle@mystandby dump]$ cat testlob001.sql

  15. -- CONNECT FIRSOULER

  16. ALTER SESSION SET EVENTS '10150 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  17. ALTER SESSION SET EVENTS '10904 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  18. ALTER SESSION SET EVENTS '25475 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  19. ALTER SESSION SET EVENTS '10407 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  20. ALTER SESSION SET EVENTS '10851 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  21. ALTER SESSION SET EVENTS '22830 TRACE NAME CONTEXT FOREVER, LEVEL 192 ';

  22. -- new object type path: TABLE_EXPORT/TABLE/TABLE

  23. CREATE TABLE "TEST"."TESTLOB"

  24.    ( "A" NUMBER,

  25.         "B" CLOB

  26.    ) SEGMENT CREATION IMMEDIATE

  27.   PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255

  28.  NOCOMPRESS LOGGING

  29.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  30.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  31.   BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)

  32.   TABLESPACE "TEST"

  33.  LOB ("B") STORE AS BASICFILE (

  34.   TABLESPACE "TEST" ENABLE STORAGE IN ROW CHUNK 8192

  35.   NOCACHE LOGGING

  36.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  37.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  38.   BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)) ;

  39. [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

  1. [oracle@mystandby dump]$ impdp firsouler/abc directory=sh_dmp dumpfile=testlob01.dmp remap_tablespace=firsouler:test logfile=implob.log

  3. Import: Release 11.2.0.4.0 - Production on Fri Sep 29 15:52:58 2017

  5. Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

  7. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

  8. With the Partitioning, OLAP, Data Mining and Real Application Testing options

  9. ORA-31626: job does not exist

  10. ORA-31633: unable to create master table "FIRSOULER.SYS_IMPORT_FULL_05"

  11. ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95

  12. ORA-06512: at "SYS.KUPV$FT", line 1038

  13. 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

  1. [oracle@mystandby dump]$ impdp firsouler/abc  directory=sh_dmp dumpfile=testlob01.dmp remap_schema=test:firsouler remap_tablespace=test:firsouler sqlfile=testlob001.sql

  3. Import: Release 11.2.0.4.0 - Production on Fri Sep 29 16:04:23 2017

  5. Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

  7. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

  8. With the Partitioning, OLAP, Data Mining and Real Application Testing options

  9. Master table "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully loaded/unloaded

  10. 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

  11. Processing object type TABLE_EXPORT/TABLE/TABLE

  12. Job "FIRSOULER"."SYS_SQL_FILE_FULL_01" successfully completed at Fri Sep 29 16:04:25 2017 elapsed 0 00:00:01

  14. [oracle@mystandby dump]$ cat testlob0

  15. testlob001.sql  testlob01.dmp

  16. [oracle@mystandby dump]$ cat testlob001.sql

  17. -- CONNECT FIRSOULER

  18. ALTER SESSION SET EVENTS '10150 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  19. ALTER SESSION SET EVENTS '10904 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  20. ALTER SESSION SET EVENTS '25475 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  21. ALTER SESSION SET EVENTS '10407 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  22. ALTER SESSION SET EVENTS '10851 TRACE NAME CONTEXT FOREVER, LEVEL 1';

  23. ALTER SESSION SET EVENTS '22830 TRACE NAME CONTEXT FOREVER, LEVEL 192 ';

  24. -- new object type path: TABLE_EXPORT/TABLE/TABLE

  25. CREATE TABLE "FIRSOULER"."TESTLOB"

  26.    ( "A" NUMBER,

  27.         "B" CLOB

  28.    ) SEGMENT CREATION IMMEDIATE

  29.   PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255

  30.  NOCOMPRESS LOGGING

  31.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  32.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  33.   BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)

  34.   TABLESPACE "FIRSOULER"

  35.  LOB ("B") STORE AS BASICFILE (

  36.   TABLESPACE "FIRSOULER" ENABLE STORAGE IN ROW CHUNK 8192

  37.   NOCACHE LOGGING

  38.   STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

  39.   PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1

  40.   BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT))

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