issue 1:

使用expdp时遭遇ora-31650

D:\oracle\diag\rdbms \trace>expdp \"/ as sysdba\"  schemas=JUSTIN dumpfile=JUSTIN_120803.dmp directory=datapumpdir

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

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

ORA-31626: job does not exist

ORA-31650: timeout waiting for master process response

MOS常见的原因是

1      RAC不同节点试图同时使用expdp

2      sga不足，调整sga_target至少为1G

      3    aq_tm_processes=0

解决方法：

但该数据库是单实例，且sga_target/sga_max_size=8g应该足够了，应该是第3种原因，果然aq_tm_processes设置为0，刚开始该为2，仍然抱错，接着改成10才成功。重新启动db,才能生效：

issue 2:

expdp导出遇到ORA-39064: 无法写入日志文件

expdp导出遇到ORA-39064: 无法写入日志文件

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1. . . 导出了 "USER_XXXX"."TAB_YYYY"                0 KB       0 行  
2. ORA-39064: 无法写入日志文件  
3. ORA-29285: 文件写入错误  

经过搜索mos，有如下的文章给出了解决方案：
Error ORA-39064 Might Be Encountered By DataPump Export (EXPDP) When NLS_LANG Is Different From Database Character Set (Doc ID 1321034.1)

在该方案中给出的解决方案是：Please set the character set in environment variable NLS_LANG to database character set.

方法如下：

set nls_lang=

12C expdp issue