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Postgres FD Implementation
Commit 508f96f5 authored by Bruce Momjian's avatar Bruce Momjian
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Tue Nov 22 10:04:06 EST 2005
Last updated: Tue Nov 22 10:12:24 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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doc/FAQ_DEV
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Developer's Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Thu Oct 27 09:48:14 EDT 2005
Last updated: Tue Nov 22 10:13:04 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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doc/src/FAQ/FAQ.html
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doc/src/FAQ/FAQ_DEV.html
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<H1>Developer's Frequently Asked Questions (FAQ) for
PostgreSQL</H1>
<P>Last updated: Thu Oct 27 09:48:14 EDT 2005</P>
<P>Last updated: Tue Nov 22 10:13:04 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
......@@ -79,7 +79,7 @@
<H2>General Questions</H2>
<H3><A name="1.1">1.1</A>) How do I get involved in PostgreSQL
<H3 ID="1.1">1.1) How do I get involved in PostgreSQL
development?</H3>
<P>Download the code and have a look around. See <A href=
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contributors and core members of the project discuss
development.</P>
<H3><A name="1.2">1.2</A>) What development environment is required
<H3 ID="1.2">1.2) What development environment is required
to develop code?</H3>
<P>PostgreSQL is developed mostly in the C programming language. It
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when you make a modification to a C header file, all files depend
upon that file are also rebuilt.</P>
<H3><A name="1.3">1.3</A>) What areas need work?</H3>
<H3 ID="1.3">1.3) What areas need work?</H3>
Outstanding features are detailed in the TODO list. This is located
in <I>doc/TODO</I> in the source distribution or at <A href=
"http://www.postgresql.org/docs/faqs.TODO.html">
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archives, the SQL standards and the recommend texts (see <A href=
"#1.10">1.10</A>).</P>
<H3><A name="1.4">1.4</A>) What do I do after choosing an item to
<H3 ID="1.4">1.4) What do I do after choosing an item to
work on?</H3>
<P>Send an email to pgsql-hackers with a proposal for what you want
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<a href="http://momjian.postgresql.org/cgi-bin/pgpatches_hold">
http://momjian.postgresql.org/cgi-bin/pgpatches2</a>.</P>
<H3><A name="1.5">1.5</A>) I've developed a patch, what next?</H3>
<H3 ID="1.5">1.5) I've developed a patch, what next?</H3>
<P>Generate the patch in contextual diff format. If you are
unfamiliar with this, you might find the script
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that, let us know and we will manually update the documentation when
the patch is applied.</P>
<H3><A name="1.6">1.6</A>) Where can I learn more about the
<H3 ID="1.6">1.6) Where can I learn more about the
code?</H3>
<P>Other than documentation in the source tree itself, you can find
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"http://www.postgresql.org/developer">
http://www.postgresql.org/developer</A>.</P>
<H3><A name="1.7">1.7</A>) How do I download/update the current
<H3 ID="1.7">1.7) How do I download/update the current
source tree?</H3>
<P>There are several ways to obtain the source tree. Occasional
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"http://developer.postgresql.org/docs/postgres/cvs.html">
http://developer.postgresql.org/docs/postgres/cvs.html</A>.</P>
<H3><A name="1.8">1.8</A>) How do I test my changes?</H3>
<H3 ID="1.8">1.8) How do I test my changes?</H3>
<P><B>Basic system testing</B></P>
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you can use the <I>--enable-depend</I> option of <I>configure</I>
to have the compiler compute the dependencies automatically.</P>
<H3><A name="1.9">1.9</A>) What tools are available for
<H3 ID="1.9">1.9) What tools are available for
developers?</H3>
<P>First, all the files in the <I>src/tools</I> directory are
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There is also a script called <I>unused_oids</I> in
<I>pgsql/src/include/catalog</I> that shows the unused oids.</P>
<H3><A name="1.10">1.10</A>) What books are good for
<H3 ID="1.10">1.10) What books are good for
developers?</H3>
<P>I have four good books, <I>An Introduction to Database
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on-line written by Jim Gray at <A href=
"http://www.benchmarkresources.com">http://www.benchmarkresources.com.</A>.</P>
<H3><A name="1.11">1.11</A>) What is configure all about?</H3>
<H3 ID="1.11">1.11) What is configure all about?</H3>
<P>The files <I>configure</I> and <I>configure.in</I> are part of
the GNU <I>autoconf</I> package. Configure allows us to test for
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all files derived by configure are removed, so you see only the
file contained in the source distribution.</P>
<H3><A name="1.12">1.12</A>) How do I add a new port?</H3>
<H3 ID="1.12">1.12) How do I add a new port?</H3>
<P>There are a variety of places that need to be modified to add a
new port. First, start in the <I>src/template</I> directory. Add an
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handling. There is a <I>backend/port</I> directory if you need
special files for your OS.</P>
<H3><A name="1.13">1.13</A>) Why don't you use threads, raw
<H3 ID="1.13">1.13) Why don't you use threads, raw
devices, async-I/O, &lt;insert your favorite wizz-bang feature
here&gt;?</H3>
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cautious about their adoption. The TODO list often contains links
to discussions showing our reasoning in these areas.</P>
<H3><A name="1.14">1.14</A>) How are RPMs packaged?</H3>
<H3 ID="1.14">1.14) How are RPMs packaged?</H3>
<P>This was written by Lamar Owen:</P>
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<P>Of course, there are many projects that DO include all the files
necessary to build RPMs from their Official Tarball (TM).</P>
<H3><A name="1.15">1.15</A>) How are CVS branches managed?</H3>
<H3 ID="1.15">1.15) How are CVS branches managed?</H3>
<P>This was written by Tom Lane:</P>
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dot-release or two, so that we won't have to double-patch the first
wave of fixes.</P>
<H3><A name="1.16">1.16</A>) Where can I get a copy of the SQL
<H3 ID="1.16">1.16) Where can I get a copy of the SQL
standards?</H3>
<P>There are three versions of the SQL standard: SQL-92, SQL:1999,
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(paper)</LI>
</UL>
<H3><A name="1.17">1.17</A>) Where can I get technical
<H3 ID="1.17">1.17) Where can I get technical
assistance?</H3>
<P>Many technical questions held by those new to the code have been
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questions about development of new features, on IRC at
irc.freenode.net in the #postgresql channel.</P>
<H3><A name="1.18">1.18</A>) How do I get involved in PostgreSQL
<H3 ID="1.18">1.18) How do I get involved in PostgreSQL
web site development?</H3>
<P>PostgreSQL website development is discussed on the
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<H2>Technical Questions</H2>
<H3><A name="2.1">2.1</A>) How do I efficiently access information
<H3 ID="2.1">2.1) How do I efficiently access information
in tables from the backend code?</H3>
<P>You first need to find the tuples(rows) you are interested in.
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<I>ReleaseBuffer()</I>, in the <I>heap_fetch()</I> case. Or it may
be a palloc'ed tuple, that you must <I>pfree()</I> when finished.
<H3><A name="2.2">2.2</A>) Why are table, column, type, function,
<H3 ID="2.2">2.2) Why are table, column, type, function,
view names sometimes referenced as <I>Name</I> or <I>NameData,</I>
and sometimes as <I>char *?</I></H3>
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names(char *), there are many cases where Name and char * are used
interchangeably.</P>
<H3><A name="2.3">2.3</A>) Why do we use <I>Node</I> and
<H3 ID="2.3">2.3) Why do we use <I>Node</I> and
<I>List</I> to make data structures?</H3>
<P>We do this because this allows a consistent way to pass data
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The output appears in the postmaster log file, or on your screen if
you are running a backend directly without a postmaster.
<H3><A name="2.4">2.4</A>) I just added a field to a structure.
<H3 ID="2.4">2.4) I just added a field to a structure.
What else should I do?</H3>
<P>The structures passing around from the parser, rewrite,
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places the structure might need code for your new field. <I>mkid</I>
is helpful with this (see <A href="#1.9">1.9</A>).</P>
<H3><A name="2.5">2.5</A>) Why do we use <I>palloc</I>() and
<H3 ID="2.5">2.5) Why do we use <I>palloc</I>() and
<I>pfree</I>() to allocate memory?</H3>
<P><I>palloc()</I> and <I>pfree()</I> are used in place of malloc()
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memory can be allocated in. These affect when the allocated memory
is freed by the backend.</P>
<H3><A name="2.6">2.6</A>) What is ereport()?</H3>
<H3 ID="2.6">2.6) What is ereport()?</H3>
<P><I>ereport()</I> is used to send messages to the front-end, and
optionally terminate the current query being processed. The first
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descriptors so you don't need to clean these up before the
call.</P>
<H3><A name="2.7">2.7</A>) What is CommandCounterIncrement()?</H3>
<H3 ID="2.7">2.7) What is CommandCounterIncrement()?</H3>
<P>Normally, transactions can not see the rows they modify. This
allows <CODE>UPDATE foo SET x = x + 1</CODE> to work correctly.</P>
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increments the Command Counter, creating a new part of the
transaction.</P>
<H3><A name="2.8">2.8</A>) What debugging features are
<H3 ID="2.8">2.8) What debugging features are
available?</H3>
<P>First, try running <I>configure</I> with the --enable-cassert
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