Postgres supports the copy command, though I'm not sure how to use it via DBI: 
Command:     COPY
Description: Copies data between files and tables
Syntax:
COPY [ BINARY ] table [ WITH OIDS ]
    FROM { 'filename' | stdin }
    [ [USING] DELIMITERS 'delimiter' ]
    [ WITH NULL AS 'null string' ]
COPY [ BINARY ] table [ WITH OIDS ]
    TO { 'filename' | stdout }
    [ [USING] DELIMITERS 'delimiter' ]
    [ WITH NULL AS 'null string' ]

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holli, /regexed monk/

In reply to Re: Quickest way to insert many rows with DBI by holli
in thread Quickest way to insert many rows with DBI by Anonymous Monk

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