Port Bug Report: pg_dump eats memory when making backup

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Petter Reinholdtsen
Your email address : pere(at)td(dot)org(dot)uit(dot)no

Category : runtime: front-end
Severity : serious

Summary: pg_dump eats memory when making backup

System Configuration
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Operating System : Linux RedHat 5.2

PostgreSQL version : 6.5

Compiler used : gcc 2.7.2.3

Hardware:
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Linux picknose.student.uit.no 2.2.10 #2 SMP Tue Jun 15 16:41:59 METDST 1999 i686 unknown
Pentium II 350 MHz 256MB RAM

Versions of other tools:
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Problem Description:
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When running 'pg_dump -D -a -n <database>' to make a backup
of the data, the pg_dump program gets enormous. My database
makes a 104 MB backup file, and the pg_dump program had
~90MB memory usage. Larger databases gives a bigger memory
footprint, sometime to much for the machine.

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Test Case:
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Solution:
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