Situations in Which Direct Path Load Is Not Used
If any of the following conditions exist for a table, then Data Pump uses external tables rather than direct path to load the data for that table:
A global index on multipartition tables exists during a single-partition load. This includes object tables that are partitioned.
A domain index exists for a LOB column.
A table is in a cluster.
There is an active trigger on a preexisting table.
Fine-grained access control is enabled in insert mode on a preexisting table.
A table contains BFILE columns or columns of opaque
types.
A referential integrity constraint is present on a preexisting table.
A table contains VARRAY columns with an embedded
opaque type.
The table has encrypted columns.
The table into which data is being imported is a preexisting table and at least one of the following conditions exists:
There is an active trigger
The table is partitioned
Fine-grained access control is in insert mode
A referential integrity constraint exists
A unique index exists
Supplemental logging is enabled and the table has at least one LOB column.
The Data Pump command for the specified table used
the QUERY, SAMPLE,
or REMAP_DATA parameter.
A table contains a column (including
a VARRAY column) with a TIMESTAMP WITH TIME
ZONE datatype and the version of the time zone data file is
different between the export and import systems.
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原文地址：http://www.cnblogs.com/gispf/p/3753456.html
