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
zx@ORCL>select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE11.2.0.4.0Production TNS for Linux: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production创建测试表
zx@ORCL>create table e1 (id number,name varchar2(20)); Table created. zx@ORCL>create table e2 (id number,birthday date); Table created.插入测试数据
zx@ORCL>insert into e1 select level,lpad(level,20,'*') from dual connect by level <= 100; 100 rows created. zx@ORCL>commit; Commit complete. zx@ORCL>insert into e2 select level,sysdate-50+level from dual connect by level <= 100; 100 rows created. zx@ORCL>commit; Commit complete.创建目录
zx@ORCL>create directory dir as '/home/oracle/'; Directory created. zx@ORCL>host测试使用query导出
注意：如果query条件在parfile中则不需要用'\'进行转义
[oracle@rhel6 ~]$ 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
zx@ORCL>select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 2179047 zx@ORCL>select count(*) from e1; COUNT(*) ---------- 100删除部分数据
zx@ORCL>delete from e1 where id<20; 19 rows deleted. zx@ORCL>commit; Commit complete. zx@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
zx@ORCL>select count(*) from e1 where id in( select id from e2 where birthday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\删除e2部分数据
zx@ORCL>delete from e2 where id>25 and id<30; 4 rows deleted. zx@ORCL>commit; Commit complete. zx@ORCL>select count(*) from e1 where id in( select id from e2 where birthday测试query及flashback_scn，结果只是对e1应用flashback_snc，e2没有应用
zx@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\使e1和e2都应用flashback_scn
zx@ORCL>select count(*) from e1 where id in( select id from e2 as of scn 2179047 where birthday多个表使用query条件则使用','分开
[oracle@rhel6 ~]$ expdp system/123456 directory=dump dumpfile=query.dmp tables=zx.abc,zx.abce query=zx.abc:\"where id \< 4\",zx.abce:\"where id \< 4\" Export: Release 11.2.0.4.0 - Production on Fri Dec 9 16:13:41 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 FLASHBACK automatically enabled to preserve database integrity. Starting "SYSTEM"."SYS_EXPORT_TABLE_01": system/******** directory=dump dumpfile=query.dmp tables=zx.abc,zx.abce query=zx.abc:"where id < 4",zx.abce:"where id < 4" Estimate in progress using BLOCKS method... Processing object type TABLE_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 384 KB Processing object type TABLE_EXPORT/TABLE/TABLE . . exported "ZX"."ABC" 5.898 KB 2 rows . . exported "ZX"."ABCE" 5.898 KB 2 rows Master table "SYSTEM"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded ****************************************************************************** Dump file set for SYSTEM.SYS_EXPORT_TABLE_01 is: /home/oracle/query.dmp Job "SYSTEM"."SYS_EXPORT_TABLE_01" successfully completed at Fri Dec 9 16:14:04 2016 elapsed 0 00:00:19另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
