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9b619679
编写于
7月 09, 2007
作者:
T
Tom Lane
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doc/src/sgml/ref/postgres-ref.sgml
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doc/src/sgml/ref/postgres-ref.sgml
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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/postgres-ref.sgml,v 1.5
0 2007/02/16 02:10:07 alvherre
Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/postgres-ref.sgml,v 1.5
1 2007/07/09 01:08:09 tgl
Exp $
PostgreSQL documentation
-->
...
...
@@ -33,17 +33,17 @@ PostgreSQL documentation
<command>postgres</command> is the
<productname>PostgreSQL</productname> database server. In order
for a client application to access a database it connects (over a
network or locally) to a running <command>postgres</command>
process
.
network or locally) to a running <command>postgres</command>
instance
.
The <command>postgres</command> instance then starts a separate server
process to handle the connection.
</para>
<para>
One <command>postgres</command> instance always manages the data
from
One <command>postgres</command> instance always manages the data
of
exactly one database cluster. A database cluster is a collection
of databases that is stored at a common file system location (the
<quote>data area</quote>). More than one
<command>postgres</command>
process
can run on a system at one
<command>postgres</command>
instance
can run on a system at one
time, so long as they use different data areas and different
communication ports (see below). When
<command>postgres</command> starts it needs to know the location
...
...
@@ -119,8 +119,9 @@ PostgreSQL documentation
<para>
Sets the number of shared buffers for use by the server
processes. The default value of this parameter is chosen
automatically by <application>initdb</application>; refer to <xref
linkend="runtime-config-resource-memory"> for more information.
automatically by <application>initdb</application>.
Specifying this option is equivalent to setting the
<xref linkend="guc-shared-buffers"> configuration parameter.
</para>
</listitem>
</varlistentry>
...
...
@@ -256,13 +257,9 @@ PostgreSQL documentation
<listitem>
<para>
Sets the maximum number of client connections that this
server will accept. By
default, this value is 32, but it can be set as high as your
system will support. (Note that
<option>-B</option> is required to be at least twice
<option>-N</option>. See <xref linkend="kernel-resources"> for a discussion of
system resource requirements for large numbers of client
connections.) Specifying this option is equivalent to setting the
server will accept. The default value of this parameter is chosen
automatically by <application>initdb</application>.
Specifying this option is equivalent to setting the
<xref linkend="guc-max-connections"> configuration parameter.
</para>
</listitem>
...
...
@@ -272,7 +269,7 @@ PostgreSQL documentation
<term><option>-o <replaceable class="parameter">extra-options</replaceable></option></term>
<listitem>
<para>
The command
line-style options specified in <replaceable
The command
-
line-style options specified in <replaceable
class="parameter">extra-options</replaceable> are passed to
all server processes started by this
<command>postgres</command> process. If the option string contains
...
...
@@ -354,11 +351,11 @@ PostgreSQL documentation
<title>Semi-internal Options</title>
<para>
The
re are several other options that can be specified,
used
mainly for debugging purposes and in some cases to assist with
The
options described here are
used
mainly for debugging purposes
,
and in some cases to assist with
recovery of severely damaged databases. There should be no reason
to use them in a production database setup. The
se
are listed
here only for
the
use by <productname>PostgreSQL</productname>
to use them in a production database setup. The
y
are listed
here only for use by <productname>PostgreSQL</productname>
system developers. Furthermore, these options might
change or be removed in a future release without notice.
</para>
...
...
@@ -500,8 +497,9 @@ PostgreSQL documentation
<term><replaceable class="parameter">database</replaceable></term>
<listitem>
<para>
Specifies the name of the database to be accessed. If it is
omitted it defaults to the user name.
Specifies the name of the database to be accessed. This must be
the last argument on the command line. If it is
omitted it defaults to the user name.
</para>
</listitem>
</varlistentry>
...
...
@@ -647,6 +645,12 @@ PostgreSQL documentation
<refsect1>
<title>Notes</title>
<para>
The utility command <xref linkend="app-pg-ctl"> can be used to
start and shut down the <command>postgres</command> server
safely and comfortably.
</para>
<para>
If at all possible, <emphasis>do not</emphasis> use
...
...
@@ -665,16 +669,14 @@ PostgreSQL documentation
all clients to terminate before quitting, the second will
forcefully disconnect all clients, and the third will quit
immediately without proper shutdown, resulting in a recovery run
during restart. The <literal>SIGHUP</literal> signal will reload
the server configuration files. It is also possible to send
<literal>SIGHUP</literal> to an individual server process, but that
is usually not sensible.
during restart.
</para>
<para>
The utility command <xref linkend="app-pg-ctl"> can be used to
start and shut down the <command>postgres</command> server
safely and comfortably.
The <literal>SIGHUP</literal> signal will reload
the server configuration files. It is also possible to send
<literal>SIGHUP</literal> to an individual server process, but that
is usually not sensible.
</para>
<para>
...
...
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