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Update FAQ.
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‎doc/FAQ‎

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@@ -252,7 +252,7 @@
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Additional mailing lists and information about PostgreSQL can be found
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via the PostgreSQL WWW home page at:
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http://postgreSQL.org
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http://www.postgreSQL.org
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There is also an IRC channel on EFNet, channel #PostgreSQL. I use the
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unix command irc -c '#PostgreSQL' "$USER" irc.phoenix.net.
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3.1) Why does initdb fail?
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Try these:
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* check that you don't have any of the previous version's binaries
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in your path
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* check to see that you have the proper paths set
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message. Why?
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It could be a variety of problems, but first check to see that you
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have system V extensions installed in your kernel. PostgreSQL requires
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have System V extensions installed in your kernel. PostgreSQL requires
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kernel support for shared memory and semaphores.
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3.4) When I try to start the postmaster, I get IpcMemoryCreate errors. Why?
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You need to increase the postmaster's limit on how many concurrent
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backend processes it can start.
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In Postgres 6.5 and up, the default limit is 32 processes. You can
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In PostgreSQL 6.5 and up, the default limit is 32 processes. You can
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increase it by restarting the postmaster with a suitable -N value.
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With the default configuration you can set -N as large as 1024; if you
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need more, increase MAXBACKENDS in include/config.h and rebuild. You
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number of semaphores, SEMMNS and SEMMNI, the maximum number of
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processes, NPROC, the maximum number of processes per user, MAXUPRC,
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and the maximum number of open files, NFILE and NINODE. The reason
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that Postgres has a limit on the number of allowed backend processes
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that PostgreSQL has a limit on the number of allowed backend processes
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is so that you can ensure that your system won't run out of resources.
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In Postgres versions prior to 6.5, the maximum number of backends was
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64, and changing it required a rebuild after altering the MaxBackendId
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constant in include/storage/sinvaladt.h.
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In PostgreSQL versions prior to 6.5, the maximum number of backends
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was 64, and changing it required a rebuild after altering the
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MaxBackendId constant in include/storage/sinvaladt.h.
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3.13) What are the pg_tempNNN.NN files in my database directory?
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4.7)How much database disk space is required to store data from a typical
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flat file?
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A Postgres database can require about six and a half times the disk
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A PostgreSQL database can require about six and a half times the disk
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space required to store the data in a flat file.
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Consider a file of 300,000 lines with two integers on each line. The
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4.11) What is an R-tree index?
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An r-tree index is used for indexing spatial data. A hash index can't
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An R-tree index is used for indexing spatial data. A hash index can't
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handle range searches. A B-tree index only handles range searches in a
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single dimension. R-tree's can handle multi-dimensional data. For
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example, if an R-tree index can be built on an attribute of type
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4.16.1) How do I create a serial/auto-incrementing field?
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PostgreSQL supports SERIAL data type. It auto-creates a sequence and
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index on the column. For example, this...
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index on the column. For example, this:
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CREATE TABLE person (
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id SERIAL,
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name TEXT
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);
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...is automatically translated into this...
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is automatically translated into this:
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CREATE SEQUENCE person_id_seq;
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CREATE TABLE person (
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id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
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However, if you need to dump and reload the database, you need to use
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pg_dump's -o option or COPY WITH OIDS option to preserve the oids.
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For more details, see Bruce Momjian's chapter on Numbering Rows.
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Numbering Rows.
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4.16.2) How do I get the back the generated SERIAL value after an insert?
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‎doc/src/FAQ/FAQ.html‎

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@@ -324,7 +324,7 @@ <H4><A NAME="1.6">1.6</A>) Where can I get support for PostgreSQL?</H4><P>
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via the PostgreSQL WWW home page at:
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<BLOCKQUOTE>
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<A HREF="http://postgreSQL.org">http://postgreSQL.org</A>
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<A HREF="http://www.postgreSQL.org">http://www.postgreSQL.org</A>
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</BLOCKQUOTE><P>
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There is also an IRC channel on EFNet, channel #PostgreSQL.
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<H4><A NAME="3.1">3.1</A>) Why does initdb fail?</H4><P>
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Try these:
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<UL>
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<LI> check that you don't have any of the previous version's binaries in
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your path
@@ -593,7 +594,7 @@ <H4><A NAME="3.3">3.3</A>) When I start the postmaster, I get a <I>Bad
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System Call</I> or core dumped message. Why?</H4><P>
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It could be a variety of problems, but first check to see that you
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have system V extensions installed in your kernel. PostgreSQL requires
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have System V extensions installed in your kernel. PostgreSQL requires
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kernel support for shared memory and semaphores.<P>
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You need to increase the postmaster's limit on how many concurrent backend
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processes it can start.<P>
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In Postgres 6.5 and up, the default limit is 32 processes. You can
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In PostgreSQL 6.5 and up, the default limit is 32 processes. You can
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increase it by restarting the postmaster with a suitable <I>-N</I>
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value. With the default configuration you can set <I>-N</I> as large as
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1024; if you need more, increase <SMALL>MAXBACKENDS</SMALL> in
@@ -768,11 +769,11 @@ <H4><A NAME="3.12">3.12</A>) I get 'Sorry, too many clients' when trying
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<SMALL>SEMMNS</SMALL> and <SMALL>SEMMNI,</SMALL> the maximum number of
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processes, <SMALL>NPROC,</SMALL> the maximum number of processes per
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user, <SMALL>MAXUPRC,</SMALL> and the maximum number of open files,
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<SMALL>NFILE</SMALL> and <SMALL>NINODE.</SMALL> The reason that Postgres
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<SMALL>NFILE</SMALL> and <SMALL>NINODE.</SMALL> The reason that PostgreSQL
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has a limit on the number of allowed backend processes is so that you
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can ensure that your system won't run out of resources.<P>
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In Postgres versions prior to 6.5, the maximum number of backends was
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In PostgreSQL versions prior to 6.5, the maximum number of backends was
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64, and changing it required a rebuild after altering the MaxBackendId
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constant in <I>include/storage/sinvaladt.h.</I><P>
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<H4><A NAME="4.7">4.7</A>)How much database disk space is required to
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store data from a typical flat file?<BR></H4><P>
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A Postgres database can require about six and a half times the disk space
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A PostgreSQL database can require about six and a half times the disk space
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required to store the data in a flat file.<P>
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Consider a file of 300,000 lines with two integers on each line. The
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<H4><A NAME="4.11">4.11</A>) What is an R-tree index?</H4><P>
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An r-tree index is used for indexing spatial data. A hash index can't
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An R-tree index is used for indexing spatial data. A hash index can't
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handle range searches. A B-tree index only handles range searches in a
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single dimension. R-tree's can handle multi-dimensional data. For
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example, if an R-tree index can be built on an attribute of type <I>point,</I>
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serial/auto-incrementing field?</H4><P>
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PostgreSQL supports <SMALL>SERIAL</SMALL> data type. It auto-creates a
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sequence and index on the column. For example, this...
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sequence and index on the column. For example, this:
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<PRE>
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CREATE TABLE person (
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id SERIAL,
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name TEXT
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);
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</PRE>
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...is automatically translated into this...
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is automatically translated into this:
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<PRE>
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CREATE SEQUENCE person_id_seq;
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CREATE TABLE person (
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you need to dump and reload the database, you need to use <I>pg_dump's -o</I>
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option or <SMALL>COPY WITH OIDS</SMALL> option to preserve the oids.<P>
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For more details, see Bruce Momjian's chapter on
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<A HREF="http://www.postgresql.org/docs/aw_pgsql_book">Numbering Rows.</A>
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<H4><A NAME="4.16.2">4.16.2</A>) How do I get the back the generated SERIAL value after an insert?</H4><P>

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