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><H1
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NAME="SQL-ALTERSYSTEM"
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>ALTER SYSTEM</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN75901"
></A
><H2
>Name</H2
>ALTER SYSTEM&nbsp;--&nbsp;change a server configuration parameter</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN75904"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER SYSTEM SET <TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
> { TO | = } { <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> | '<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>' | DEFAULT }

ALTER SYSTEM RESET <TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
>
ALTER SYSTEM RESET ALL</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75910"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
> is used for changing server configuration
   parameters across the entire database cluster.  It can be more convenient
   than the traditional method of manually editing
   the <TT
CLASS="FILENAME"
>postgresql.conf</TT
> file.
   <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
> writes the given parameter setting to
   the <TT
CLASS="FILENAME"
>postgresql.auto.conf</TT
> file, which is read in
   addition to <TT
CLASS="FILENAME"
>postgresql.conf</TT
>.
   Setting a parameter to <TT
CLASS="LITERAL"
>DEFAULT</TT
>, or using the
   <TT
CLASS="COMMAND"
>RESET</TT
> variant, removes that configuration entry from the
   <TT
CLASS="FILENAME"
>postgresql.auto.conf</TT
> file. Use <TT
CLASS="LITERAL"
>RESET
   ALL</TT
> to remove all such configuration entries.
  </P
><P
>   Values set with <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
> will be effective after
   the next server configuration reload, or after the next server restart
   in the case of parameters that can only be changed at server start.
   A server configuration reload can be commanded by calling the SQL
   function <CODE
CLASS="FUNCTION"
>pg_reload_conf()</CODE
>, running <TT
CLASS="LITERAL"
>pg_ctl reload</TT
>,
   or sending a <SPAN
CLASS="SYSTEMITEM"
>SIGHUP</SPAN
> signal to the main server process.
  </P
><P
>   Only superusers can use <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
>.  Also, since
   this command acts directly on the file system and cannot be rolled back,
   it is not allowed inside a transaction block or function.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75929"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>configuration_parameter</I
></TT
></DT
><DD
><P
>      Name of a settable configuration parameter.  Available parameters are
      documented in <A
HREF="runtime-config.html"
>Chapter 19</A
>.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
></DT
><DD
><P
>      New value of the parameter.  Values can be specified as string
      constants, identifiers, numbers, or comma-separated lists of
      these, as appropriate for the particular parameter.
      <TT
CLASS="LITERAL"
>DEFAULT</TT
> can be written to specify removing the
      parameter and its value from <TT
CLASS="FILENAME"
>postgresql.auto.conf</TT
>.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75945"
></A
><H2
>Notes</H2
><P
>   This command can't be used to set <A
HREF="runtime-config-file-locations.html#GUC-DATA-DIRECTORY"
>data_directory</A
>,
   nor parameters that are not allowed in <TT
CLASS="FILENAME"
>postgresql.conf</TT
>
   (e.g., <A
HREF="runtime-config-preset.html"
>preset options</A
>).
  </P
><P
>   See <A
HREF="config-setting.html"
>Section 19.1</A
> for other ways to set the parameters.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75953"
></A
><H2
>Examples</H2
><P
>   Set the <TT
CLASS="LITERAL"
>wal_level</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER SYSTEM SET wal_level = replica;</PRE
><P>
  </P
><P
>   Undo that, restoring whatever setting was effective
   in <TT
CLASS="FILENAME"
>postgresql.conf</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER SYSTEM RESET wal_level;</PRE
><P>
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75961"
></A
><H2
>Compatibility</H2
><P
>   The <TT
CLASS="COMMAND"
>ALTER SYSTEM</TT
> statement is a
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> extension.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75966"
></A
><H2
>See Also</H2
><A
HREF="sql-set.html"
>SET</A
>, <A
HREF="sql-show.html"
>SHOW</A
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