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Postgres FD Implementation
Commit e8b842b9 authored by Bruce Momjian's avatar Bruce Momjian
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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 Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Wed Aug 10 15:29:42 EDT 2005 Last updated: Thu Aug 11 09:21:58 EDT 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...@@ -474,9 +474,9 @@ ...@@ -474,9 +474,9 @@
One limitation is that indexes can not be created on columns longer One limitation is that indexes can not be created on columns longer
than about 2,000 characters. Fortunately, such indexes are rarely than about 2,000 characters. Fortunately, such indexes are rarely
needed. Uniqueness is best guaranteed using another column that is an needed. Uniqueness is best guaranteed by a funtion index of an MD5
MD5 hash of the long column, and full text indexing allows for hash of the long column, and full text indexing allows for searching
searching of words within the column. of words within the column.
4.5) How much database disk space is required to store data from a typical 4.5) How much database disk space is required to store data from a typical
text file? text file?
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doc/src/FAQ/FAQ.html
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...@@ -10,7 +10,7 @@ ...@@ -10,7 +10,7 @@
alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Wed Aug 10 15:29:42 EDT 2005</P> <P>Last updated: Thu Aug 11 09:21:58 EDT 2005</P>
<P>Current maintainer: Bruce Momjian (<A href= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>) "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
...@@ -619,8 +619,8 @@ table?</TD><TD>unlimited</TD></TR> ...@@ -619,8 +619,8 @@ table?</TD><TD>unlimited</TD></TR>
<P>One limitation is that indexes can not be created on columns <P>One limitation is that indexes can not be created on columns
longer than about 2,000 characters. Fortunately, such indexes are longer than about 2,000 characters. Fortunately, such indexes are
rarely needed. Uniqueness is best guaranteed using another column rarely needed. Uniqueness is best guaranteed by a funtion index
that is an MD5 hash of the long column, and full text indexing of an MD5 hash of the long column, and full text indexing
allows for searching of words within the column.</P> allows for searching of words within the column.</P>
<H3><A name="4.5">4.5</A>) How much database disk space is required <H3><A name="4.5">4.5</A>) How much database disk space is required
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