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Update FAQ from Ian Barwick.

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Bruce Momjian 2003-06-06 22:20:40 +00:00
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri May 30 22:24:56 EDT 2003 Last updated: Fri Jun 6 18:20:23 EDT 2003
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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1.7) What is the latest release? 1.7) What is the latest release?
The latest release of PostgreSQL is version 7.3.2. The latest release of PostgreSQL is version 7.3.3.
We plan to have major releases every four months. We plan to have major releases every four months.
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There are two PostgreSQL books available online at There are two PostgreSQL books available online at
http://www.PostgreSQL.org/docs/awbook.html and http://www.PostgreSQL.org/docs/awbook.html and
http://www.commandprompt.com/ppbook/. There is a list of PostgreSQL http://www.commandprompt.com/ppbook/. There is a list of PostgreSQL
books available for purchase at http://www.ca.PostgreSQL.org/books/. books available for purchase at
There is also a collection of PostgreSQL technical articles at http://techdocs.PostgreSQL.org/techdocs/bookreviews.php. There is also
a collection of PostgreSQL technical articles at
http://techdocs.PostgreSQL.org/. http://techdocs.PostgreSQL.org/.
psql has some nice \d commands to show information about types, psql has some nice \d commands to show information about types,
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BEGIN; BEGIN;
ALTER TABLE tab ADD COLUMN new_col new_data_type; ALTER TABLE tab ADD COLUMN new_col new_data_type;
UPDATE tab SET new_col = CAST(old_col AS new_data_type); UPDATE tab SET new_col = CAST(old_col AS new_data_type);
ALTER TABLE DROP COLUMN old_col; ALTER TABLE tab DROP COLUMN old_col;
COMMIT; COMMIT;
You might then want to do VACUUM FULL tab to reclaim the disk space You might then want to do VACUUM FULL tab to reclaim the disk space

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doc/src/FAQ/FAQ.html
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alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Fri May 30 22:24:56 EDT 2003</P> <P>Last updated: Fri Jun 6 18:20:23 EDT 2003</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>)<BR> "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
@ -323,7 +323,7 @@
<H4><A name="1.7">1.7</A>) What is the latest release?</H4> <H4><A name="1.7">1.7</A>) What is the latest release?</H4>
<P>The latest release of PostgreSQL is version 7.3.2.</P> <P>The latest release of PostgreSQL is version 7.3.3.</P>
<P>We plan to have major releases every four months.</P> <P>We plan to have major releases every four months.</P>
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"http://www.commandprompt.com/ppbook/">http://www.commandprompt.com/ppbook/</A>. "http://www.commandprompt.com/ppbook/">http://www.commandprompt.com/ppbook/</A>.
There is a list of PostgreSQL books available for purchase at <A There is a list of PostgreSQL books available for purchase at <A
href= href=
"http://www.ca.PostgreSQL.org/books/">http://www.ca.PostgreSQL.org/books/</A>. "http://techdocs.postgresql.org/techdocs/bookreviews.php">http://techdocs.PostgreSQL.org/techdocs/bookreviews.php</A>.
There is also a collection of PostgreSQL technical articles at <A There is also a collection of PostgreSQL technical articles at <A
href= href=
"http://techdocs.PostgreSQL.org/">http://techdocs.PostgreSQL.org/</A>.</P> "http://techdocs.PostgreSQL.org/">http://techdocs.PostgreSQL.org/</A>.</P>
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<P>Also, if you have a success story about PostgreSQL, please submit <P>Also, if you have a success story about PostgreSQL, please submit
it to our advocacy site at <a href="http://advocacy.postgresql.org"> it to our advocacy site at <a href="http://advocacy.postgresql.org">
http://advocacy.postgresql.org</a>. http://advocacy.postgresql.org</a>.</P>
<H2 align="center">User Client Questions</H2> <H2 align="center">User Client Questions</H2>
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<I>postmaster</I>. For most systems, with default numbers of <I>postmaster</I>. For most systems, with default numbers of
buffers and processes, you need a minimum of ~1 MB. See the <A buffers and processes, you need a minimum of ~1 MB. See the <A
href= href=
"http://www.PostgreSQL.org/docs/view.php?version=current&idoc=1&file=kernel-resources.html">PostgreSQL "http://www.PostgreSQL.org/docs/view.php?version=current&amp;idoc=1&amp;file=kernel-resources.html">PostgreSQL
Administrator's Guide</A> for more detailed information about Administrator's Guide</A> for more detailed information about
shared memory and semaphores.</P> shared memory and semaphores.</P>
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BEGIN; BEGIN;
ALTER TABLE tab ADD COLUMN new_col <i>new_data_type</i>; ALTER TABLE tab ADD COLUMN new_col <i>new_data_type</i>;
UPDATE tab SET new_col = CAST(old_col AS <i>new_data_type</i>); UPDATE tab SET new_col = CAST(old_col AS <i>new_data_type</i>);
ALTER TABLE DROP COLUMN old_col; ALTER TABLE tab DROP COLUMN old_col;
COMMIT; COMMIT;
</PRE> </PRE>
<P>You might then want to do <I>VACUUM FULL tab</I> to reclaim the <P>You might then want to do <I>VACUUM FULL tab</I> to reclaim the