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ORA-31633: unable to create master table "SYSTEM.NIGHTLY_EXPORT"

expdp  parfile=params

content of params:
userid=system/manager
job_name=nightly_export.
.
.
.
[This will create a table with NIGHTLY_EXPORT in system schema or from the schema from which the expdp command is run]

Export: Release 11.2.0.3.0 - Production on Wed Sep 18 08:57:30 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
ORA-31626: job does not exist
ORA-31633: unable to create master table "SYSTEM.NIGHTLY_EXPORT"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPV$FT", line 1020
ORA-00955: name is already used by an existing object

This error comes when expdp job with the specified parameter job_name is already existing. It could be the case 1) expdp job is attempted to start with given job_name while expdp job with the same job_name is already running 2) expdp job with given job_name is currently not executing but it was previously stopped or cancelled.

Remedy: Verify from querying DBA_DATAPUMP_JOBS that job with specified job_name is not running then drop the table SYSTEM.NIGHTLY_EXPORT as in given example.

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