Oracle 11g expdp中提供了query参数，可以在需要按条件导出表中部分数据时使用，它的使用就像是在select语句中的where条件使用一样。
数据库版本
linuxidc@ORCL>select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE11.2.0.4.0Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production
创建测试表
linuxidc@ORCL>create table e1 (id number,name varchar2(20));
Table created.
linuxidc@ORCL>create table e2 (id number,birthday date);
Table created.
插入测试数据
linuxidc@ORCL>insert into e1 select level,lpad(level,20,'*') from dual connect by level <= 100;
100 rows created.
linuxidc@ORCL>commit;
Commit complete.
linuxidc@ORCL>insert into e2 select level,sysdate-50+level from dual connect by level <= 100;
100 rows created.
linuxidc@ORCL>commit;
Commit complete.
创建目录
linuxidc@ORCL>create directory dir as '/home/oracle/';
Directory created.
linuxidc@ORCL>host
测试使用query导出
注意：如果query条件在parfile中则不需要用'\'进行转义
[oracle@rhel6 ~]$ expdp zx/zx directory=dir dumpfile=e1.dmp tables=zx.e1 query=zx.e1:\"where id<=50\"
bash: =50": No such file or directory
Export: Release 11.2.0.4.0 - Production on Thu Jul 21 14:23:11 2016
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 "ZX"."SYS_EXPORT_TABLE_01": zx/******** directory=dir dumpfile=e1.dmp tables=zx.e1 query=zx.e1:"where id<=50"
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "ZX"."E1" 6.757 KB 50 rows
Master table "ZX"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ZX.SYS_EXPORT_TABLE_01 is:
/home/oracle/e1.dmp
Job "ZX"."SYS_EXPORT_TABLE_01" successfully completed at Thu Jul 21 14:23:26 2016 elapsed 0 00:00:11
exit
查询scn号
linuxidc@ORCL>select dbms_flashback.get_system_change_number from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
2179047
linuxidc@ORCL>select count(*) from e1;
COUNT(*)
----------
100
删除部分数据
linuxidc@ORCL>delete from e1 where id<20;
19 rows deleted.
linuxidc@ORCL>commit;
Commit complete.
linuxidc@ORCL>host
测试query及flashback_scn
[oracle@rhel6 ~]$ expdp zx/zx directory=dir dumpfile=e1_1.dmp tables=zx.e1 query=zx.e1:\"where id\<=50\" flashback_scn=2179047
Export: Release 11.2.0.4.0 - Production on Thu Jul 21 14:25:41 2016
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 "ZX"."SYS_EXPORT_TABLE_01": zx/******** directory=dir dumpfile=e1_1.dmp tables=zx.e1 query=zx.e1:"where id<=50" flashback_scn=2179047
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "ZX"."E1" 6.757 KB 50 rows
Master table "ZX"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ZX.SYS_EXPORT_TABLE_01 is:
/home/oracle/e1_1.dmp
Job "ZX"."SYS_EXPORT_TABLE_01" successfully completed at Thu Jul 21 14:25:49 2016 elapsed 0 00:00:06
[oracle@rhel6 ~]$ exit
exit
测试复杂query导出
linuxidc@ORCL>select count(*) from e1 where id in( select id from e2 where birthday<sysdate);
COUNT(*)
----------
31
[oracle@rhel6 ~]$ expdp zx/zx directory=dir dumpfile=e1_2.dmp tables=zx.e1 query=zx.e1:\"where id in \( select id from e2 where birthday\<sysdate\)\"
Export: Release 11.2.0.4.0 - Production on Thu Jul 21 14:31:04 2016
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 "ZX"."SYS_EXPORT_TABLE_01": zx/******** directory=dir dumpfile=e1_2.dmp tables=zx.e1 query=zx.e1:"where id in ( select id from e2 where birthday<sysdate)"
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "ZX"."E1" 6.242 KB 31 rows
Master table "ZX"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ZX.SYS_EXPORT_TABLE_01 is:
/home/oracle/e1_2.dmp
Job "ZX"."SYS_EXPORT_TABLE_01" successfully completed at Thu Jul 21 14:31:12 2016 elapsed 0 00:00:06
[oracle@rhel6 ~]$ exit
exit
linuxidc@ORCL>host
测试复杂query及flashback_scn导出
[oracle@rhel6 ~]$ expdp zx/zx directory=dir dumpfile=e1_3.dmp tables=zx.e1 query=zx.e1:\"where id in \( select id from e2 where birthday\<sysdate\)\" flashback_scn=2179047
Export: Release 11.2.0.4.0 - Production on Thu Jul 21 14:32:07 2016
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 "ZX"."SYS_EXPORT_TABLE_01": zx/******** directory=dir dumpfile=e1_3.dmp tables=zx.e1 query=zx.e1:"where id in ( select id from e2 where birthday<sysdate)" flashback_scn=2179047
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "ZX"."E1" 6.757 KB 50 rows
Master table "ZX"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ZX.SYS_EXPORT_TABLE_01 is:
/home/oracle/e1_3.dmp
Job "ZX"."SYS_EXPORT_TABLE_01" successfully completed at Thu Jul 21 14:32:14 2016 elapsed 0 00:00:06
[oracle@rhel6 ~]$ exit
exit
删除e2部分数据
linuxidc@ORCL>delete from e2 where id>25 and id<30;
4 rows deleted.
linuxidc@ORCL>commit;
Commit complete.
linuxidc@ORCL>select count(*) from e1 where id in( select id from e2 where birthday<sysdate);
COUNT(*)
----------
27
测试query及flashback_scn，结果只是对e1应用flashback_snc，e2没有应用
linuxidc@ORCL>host
[oracle@rhel6 ~]$ expdp zx/zx directory=dir dumpfile=e1_4.dmp tables=zx.e1 query=zx.e1:\"where id in \( select id from e2 where birthday\<sysdate\)\" flashback_scn=2179047
Export: Release 11.2.0.4.0 - Production on Thu Jul 21 14:33:55 2016
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 "ZX"."SYS_EXPORT_TABLE_01": zx/******** directory=dir dumpfile=e1_4.dmp tables=zx.e1 query=zx.e1:"where id in ( select id from e2 where birthday<sysdate)" flashback_scn=2179047
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "ZX"."E1" 6.648 KB 46 rows
Master table "ZX"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ZX.SYS_EXPORT_TABLE_01 is:
/home/oracle/e1_4.dmp
Job "ZX"."SYS_EXPORT_TABLE_01" successfully completed at Thu Jul 21 14:34:03 2016 elapsed 0 00:00:06
[oracle@rhel6 ~]$ exit
exit
使e1和e2都应用flashback_scn
linuxidc@ORCL>select count(*) from e1 where id in( select id from e2 as of scn 2179047 where birthday<sysdate);
COUNT(*)
----------
31
linuxidc@ORCL>host