Storage space usage

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To: pgsql-performance@xxxxxxxxxxxxxx
Subject: Storage space usage
From: "Gangadharan S.A." <gangadharan@xxxxxxxxx>
Date: Fri, 1 Feb 2008 14:14:18 +0530

Hi,
I have 2 questions regarding the storage optimization done by Postgres:
1) Is a NULL value optimized for storage. If I have a timestamp (or some such) field that I set to default NULL, will it still use up the full space for the data type.
2) Similarly, if I have a text array, is an empty array optimized for storage?
Thanks,
Gangadharan

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