备份复杂关联查询后的T表数据

　　1.T表数据内容如下

　　sec@secooler> select * from t;

　　X Y

　　---------- ---------------------------------

　　1 sec1

　　2 sec2

　　3 sec3

　　4 sec4

　　2.创建另外一张关联表T_REL，并初始化两条记录

　　sec@secooler> create table t_rel (x int);

　　Table created.

　　sec@secooler> insert into t_rel values (2);

　　1 row created.

　　sec@secooler> insert into t_rel values (3);

　　1 row created.

　　sec@secooler> commit;

　　Commit complete.

　　sec@secooler> select * From t_rel;

　　X

　　----------

　　2

　　3

　　3.我们的目标是使用EXP获取如下数据

　　sec@secooler> select t.* from t, t_rel where t.x=t_rel.x;

　　X Y

　　---------- -------------------------------

　　2 sec2

　　3 sec3

　　4.方法如下，注意QUERY子句的书写方法

　　secooler@secDB /exp$ exp sec/sec file=sec.dmp log=sec.log tables=t query=&t,t_rel where t.x=t_rel.x&

　　Export: Release 11.2.0.1.0 - Production on Mon Mar 8 23:20:00 2010

　　Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

　　Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

　　With the Partitioning, Oracle Label Security, OLAP, Data Mining,

　　Oracle Database Vault and Real Application Testing option

　　Export done in AL32UTF8 character set and AL16UTF16 NCHAR character set

　　server uses ZHS16GBK character set (possible charset conversion)

　　About to export specified tables via Conventional Path ...

　　. . exporting table      T    2 rows exported

　　Export terminated successfully without warnings.

　　5.使用PARFILE参数完成方法如下

　　1）编辑参数文件

　　secooler@secDB /exp$ vi sec.par

　　userid=sec/sec

　　file=sec.dmp

　　log=sec.log

　　tables=t

　　query=&t,t_rel where t.x=t_rel.x&

　　~

　　~

　　2）使用参数文件完成数据导出

　　secooler@secDB /exp$ exp parfile=sec.par

　　Export: Release 11.2.0.1.0 - Production on Mon Mar 8 23:27:24 2010

　　Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

　　Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

　　With the Partitioning, Oracle Label Security, OLAP, Data Mining,

　　Oracle Database Vault and Real Application Testing option

　　Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set

　　About to export specified tables via Conventional Path ...

　　. . exporting table      T    2 rows exported

　　Export terminated successfully without warnings.

　　6.导入验证

　　sys@secooler> conn sec/sec

　　Connected.

　　sec@secooler> delete from t;

　　4 rows deleted.

　　sec@secooler> commit;

　　Commit complete.

　　sec@secooler> exit

　　secooler@secDB /exp$ imp sec/sec file=sec.dmp ignore=y full=y

　　Import: Release 11.2.0.1.0 - Production on Mon Mar 8 23:30:30 2010

　　Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

　　Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

　　With the Partitioning, Oracle Label Security, OLAP, Data Mining,

　　Oracle Database Vault and Real Application Testing option

　　Export file created by EXPORT:V11.02.00 via conventional path

　　import done in ZHS16GBK character set and AL16UTF16 NCHAR character set

　　. importing SEC's objects into SEC

　　. importing SEC's objects into SEC

　　. . importing table    &T&    2 rows imported

　　Import terminated successfully without warnings.

　　secooler@secDB /exp$ sqlplus sec/sec

　　SQL*Plus: Release 11.2.0.1.0 Production on Mon Mar 8 23:31:53 2010

　　Copyright (c) 1982, 2009, Oracle.  All rights reserved.

　　Connected to:

　　Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

　　With the Partitioning, Oracle Label Security, OLAP, Data Mining,

　　Oracle Database Vault and Real Application Testing options

　　sec@secooler> select * from t;

　　X Y

　　---------- --------------------

　　2 sec2

　　3 sec3

　　成功，验证完毕

　　7.小结

　　在使用EXP完成复杂关系条件下数据导出时，尤其要注意在不同操作系统平台上的转义方法。建议使用参数文件（结合PARFILE参数使用）规避这个不大不小的问题。