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Update MD5 mention for long values.
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doc/FAQ

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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated: Wed Aug 10 15:29:42 EDT 2005
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Last updated: Thu Aug 11 09:21:58 EDT 2005
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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One limitation is that indexes can not be created on columns longer
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than about 2,000 characters. Fortunately, such indexes are rarely
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needed. Uniqueness is best guaranteed using another column that is an
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MD5 hash of the long column, and full text indexing allows for
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searching of words within the column.
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needed. Uniqueness is best guaranteed by a funtion index of an MD5
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hash of the long column, and full text indexing allows for searching
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of words within the column.
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4.5) How much database disk space is required to store data from a typical
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text file?

doc/src/FAQ/FAQ.html

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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated: Wed Aug 10 15:29:42 EDT 2005</P>
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<P>Last updated: Thu Aug 11 09:21:58 EDT 2005</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>)
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<P>One limitation is that indexes can not be created on columns
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longer than about 2,000 characters. Fortunately, such indexes are
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rarely needed. Uniqueness is best guaranteed using another column
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that is an MD5 hash of the long column, and full text indexing
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rarely needed. Uniqueness is best guaranteed by a funtion index
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of an MD5 hash of the long column, and full text indexing
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allows for searching of words within the column.</P>
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<H3><A name="4.5">4.5</A>) How much database disk space is required

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