Answer / guest

Cause: The query that is executing requires that a data
source for an external table be read multiple times.
However, the data source is a sequential device that cannot
be reread. Examples of this type of data source is a tape or
pipe.

Action: There are a few ways around this problem. One is to
rewrite the query so that the external table is referenced
only once. Another option is to move the data source to a
rereadable device such as a disk file. A third option is to
load the data for the external table into a temporary table
and change the query to reference the temporary table.

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