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<refentry id="SQL-ALTERNODE">
<indexterm zone="sql-alternode">
<primary>ALTER NODE</primary>
</indexterm>
<refmeta>
<refentrytitle>ALTER NODE</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER NODE</refname>
<refpurpose>alter a cluster node</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
ALTER NODE <replaceable class="parameter">nodename</replaceable> WITH
(
[ TYPE = <replaceable class="parameter">nodetype</replaceable>,]
[ HOST = <replaceable class="parameter">hostname</replaceable>,]
[ PORT = <replaceable class="parameter">portnum</replaceable>,]
[ PRIMARY [ = <replaceable class="parameter">boolean</replaceable>],]
[ PREFERRED [ = <replaceable class="parameter">boolean</replaceable> ] ]
)
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER NODE</command> is a new SQL command specific
to <productname>Postgres-XL</productname> that modifies
cluster node information in catalog pgxc_node.
</para>
<para>
Node connection that has been modified does not guarantee that connection
information cached in the pooler is updated accordingly.
</para>
<para>
<command>ALTER NODE</command> only runs on the local node where it is launched.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">nodename</replaceable></term>
<listitem>
<para>
The name of the selected cluster node.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>TYPE</literal></term>
<listitem>
<para>
The type of the cluster node. It is possible to specify
a Coordinator node or a Datanode node.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>PRIMARY</literal></term>
<listitem>
<para>
Defines if the cluster node is used as a primary node for replicated
write operations. A <replaceable class="parameter">boolean</replaceable>
value can be specified. In case no value is specified, <literal>PRIMARY</literal>
acts like <literal>true</>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>PREFERRED</literal></term>
<listitem>
<para>
Defines if the cluster node is used as a preferred node for replicated
read operations. A <replaceable class="parameter">boolean</replaceable>
value can be specified. In case no value is specified, <literal>PREFERRED</literal>
acts like <literal>true</>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">nodetype</replaceable></term>
<listitem>
<para>
The node type for given cluster node. Possible values are:
'coordinator' for a Coordinator node and 'datanode' for a
Datanode node.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">hostname</replaceable></term>
<listitem>
<para>
The hostname or IP used to connect to the cluster node.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">portnum</replaceable></term>
<listitem>
<para>
The port number used to connect to the cluster node.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
A Datanode can be modified as <literal>PRIMARY</literal> and
as <literal>PREFERRED</literal> as many times as necessary.
</para>
<para>
A node type cannot be modified.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Modify a Coordinator node located on local machine to use port 6543.
<programlisting>
ALTER NODE coord_node WITH (PORT = 6543, HOST = 'localhost');
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
<command>ALTER NODE</command> does not conform to the <acronym>
SQL</acronym> standards, it is a Postgres-XL specific command.
</para>
</refsect1>
</refentry>
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