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><H1
><A
NAME="SQL-ALTERDATABASE"
>ALTER DATABASE</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN37238"
></A
><H2
>Name</H2
>ALTER DATABASE -- change a database</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN37241"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER DATABASE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET <TT
CLASS="REPLACEABLE"
><I
>variable</I
></TT
> { TO | = } { <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> | DEFAULT }
ALTER DATABASE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RESET <TT
CLASS="REPLACEABLE"
><I
>variable</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37248"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER DATABASE</TT
> is used to change the session
default of a run-time configuration variable for a
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> database. Whenever a new
session is subsequently started in that database, the specified
value becomes the session default value.
The database-specific default
overrides whatever setting is present in <TT
CLASS="FILENAME"
>postgresql.conf</TT
>
or has been received from the postmaster.
</P
><P
> Only a superuser or the database owner can change the session defaults for a
database.
</P
><DIV
CLASS="REFSECT2"
><A
NAME="AEN37255"
></A
><H3
>Parameters</H3
><P
> <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name of the database whose session defaults are to be altered.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>variable</I
></TT
><BR><TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
></DT
><DD
><P
> Set the session default for this database of the specified
configuration variable to the given value. If
<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> is <TT
CLASS="LITERAL"
>DEFAULT</TT
>
or, equivalently, <TT
CLASS="LITERAL"
>RESET</TT
> is used, the
database-specific variable setting is removed and the system-wide
default
setting will be inherited in new sessions. Use <TT
CLASS="LITERAL"
>RESET
ALL</TT
> to clear all settings.
</P
><P
> See <A
HREF="sql-set.html"
><I
>SET</I
></A
> and the
<I
CLASS="CITETITLE"
>Administrator's Guide</I
> for more
information about allowed variable names and values.
</P
></DD
></DL
></DIV
><P>
</P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37278"
></A
><H2
>Diagnostics</H2
><P
> <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="COMPUTEROUTPUT"
>ALTER DATABASE</TT
></DT
><DD
><P
> Message returned if the alteration was successful.
</P
></DD
><DT
><TT
CLASS="COMPUTEROUTPUT"
>ERROR: database "dbname" does not exist</TT
></DT
><DD
><P
> Error message returned if the specified database is not known
to the system.
</P
></DD
></DL
></DIV
><P>
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37292"
></A
><H2
>Notes</H2
><P
> Using <A
HREF="sql-alteruser.html"
><I
>ALTER USER</I
></A
>,
it is also possible to tie a session default to a specific user
rather than a database. User-specific settings override database-specific
ones if there is a conflict.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37296"
></A
><H2
>Examples</H2
><P
> To disable index scans by default in the database
<TT
CLASS="LITERAL"
>test</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER DATABASE test SET enable_indexscan TO off;</PRE
><P>
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37301"
></A
><H2
>Compatibility</H2
><P
> The <TT
CLASS="COMMAND"
>ALTER DATABASE</TT
> statement is a
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> extension.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN37306"
></A
><H2
>See Also</H2
><A
HREF="sql-alteruser.html"
><I
>ALTER USER</I
></A
>, <A
HREF="sql-createdatabase.html"
><I
>CREATE DATABASE</I
></A
>, <A
HREF="sql-dropdatabase.html"
><I
>DROP DATABASE</I
></A
>, <A
HREF="sql-set.html"
><I
>SET</I
></A
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