今天尝试了一下用exp导出外部表，碰到了一些问题。

----导出

今天导出的时候发现一个严重的问题，导出一个很小的外部表花了很长时间，最后还是报错，而且生成的dump文件有好几个G

[oracle@oel1 ~]$ exp hr/hr file=hr.dmp log=hr.log
Export: Release 10.2.0.1.0 - Production on Fri May 31 21:23:49 2013
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses AL32UTF8 character set (possible charset conversion)
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user HR 
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user HR 
About to export HR's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export HR's tables via Conventional Path ...
. . exporting table                      ALERT_LOG
Last login: Fri May 31 21:20:56 2013 from 192.168.3.1
[oracle@oel1 ~]$ ll
-rw-r--r-- 1 oracle dba 2551078912 May 31 21:26 hr.dmp
-rw-r--r-- 1 oracle dba          0 May 31 21:23 hr.log

想了一下数据泵需要用到directory,尝试使用expdp导出。这次成功了。

[oracle@oel1 ~]$ export ORACLE_SID=PROD
[oracle@oel1 ~]$  expdp hr/hr dumpfile=hr_dp.dmp DIRECTORY=alert_dir tables=alert_log
Export: Release 10.2.0.1.0 - Production on Friday, 31 May, 2013 21:31:16
Copyright (c) 2003, 2005, Oracle.  All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
Starting "HR"."SYS_EXPORT_TABLE_01":  hr/******** dumpfile=hr_dp.dmp DIRECTORY=alert_dir tables=alert_log 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 0 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
Master table "HR"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for HR.SYS_EXPORT_TABLE_01 is:
  /u01/app/oracle/admin/PROD/bdump/hr_dp.dmp
Job "HR"."SYS_EXPORT_TABLE_01" successfully completed at 21:31:37

--导入

导入的时候，导入另外一个用户

[oracle@oel1 ~]$ impdp jeanron/jeanron dumpfile=hr_dp.dmp DIRECTORY=alert_dir tables=alert_log
Import: Release 10.2.0.1.0 - Production on Friday, 31 May, 2013 21:39:27
Copyright (c) 2003, 2005, Oracle.  All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORA-39002: invalid operation
ORA-39070: Unable to open the log file.
ORA-39087: directory name ALERT_DIR is invalid

导入的时候提示找不到diretory，我查了下，没输错啊。

最后给directory赋予了read,write权限给目标用户

SQL> grant read,write on directory alert_dir to jeanron; 
Grant succeeded.
SQL> exit
[oracle@oel1 ~]$ impdp jeanron/jeanron dumpfile=hr_dp.dmp DIRECTORY=alert_dir tables=alert_log
Import: Release 10.2.0.1.0 - Production on Friday, 31 May, 2013 21:40:04
Copyright (c) 2003, 2005, Oracle.  All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORA-31655: no data or metadata objects selected for job
ORA-39154: Objects from foreign schemas have been removed from import
Master table "JEANRON"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "JEANRON"."SYS_IMPORT_TABLE_01":  jeanron/******** dumpfile=hr_dp.dmp DIRECTORY=alert_dir tables=alert_log 
Job "JEANRON"."SYS_IMPORT_TABLE_01" successfully completed at 21:40:07

看来新特性还得用新特性提供的方法来做。