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Update null storage description.
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated: Fri Jan 23 09:41:43 EST 2004</P>
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<P>Last updated: Sat Jan 24 21:28:41 EST 2004</P>
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<P>Current maintainer: Bruce Momjian (<A href=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<P>Indexes do not require as much overhead, but do contain the data
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that is being indexed, so they can be large also.</P>
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<P><SMALL>NULL</SMALL>s are stored in bitmaps, so they
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<P><SMALL>NULL</SMALL>s are stored as bitmaps, so they
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use very little space.</P>
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<H4><A name="4.7">4.7</A>) How do I find out what tables, indexes,
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