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If unable to connect to "postgres", try "template1". This allows things to work more smoothly in the case where the postgres database has been dropped. And just in case that's not good enough, also allow the user to specify a maintenance database to be used for the initial connection, to cover the case where neither postgres nor template1 is suitable.
292 lines
7.9 KiB
Plaintext
292 lines
7.9 KiB
Plaintext
<!--
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doc/src/sgml/ref/dropdb.sgml
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PostgreSQL documentation
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-->
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<refentry id="APP-DROPDB">
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<refmeta>
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<refentrytitle><application>dropdb</application></refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo>Application</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>dropdb</refname>
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<refpurpose>remove a <productname>PostgreSQL</productname> database</refpurpose>
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</refnamediv>
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<indexterm zone="app-dropdb">
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<primary>dropdb</primary>
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</indexterm>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>dropdb</command>
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<arg rep="repeat"><replaceable>connection-option</replaceable></arg>
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<arg rep="repeat"><replaceable>option</replaceable></arg>
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<arg choice="plain"><replaceable>dbname</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<application>dropdb</application> destroys an existing
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<productname>PostgreSQL</productname> database.
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The user who executes this command must be a database
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superuser or the owner of the database.
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</para>
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<para>
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<application>dropdb</application> is a wrapper around the
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<acronym>SQL</acronym> command <xref linkend="SQL-DROPDATABASE">.
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There is no effective difference between dropping databases via
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this utility and via other methods for accessing the server.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>
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<application>dropdb</> accepts the following command-line arguments:
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">dbname</replaceable></term>
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<listitem>
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<para>
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Specifies the name of the database to be removed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-e</></term>
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<term><option>--echo</></term>
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<listitem>
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<para>
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Echo the commands that <application>dropdb</application> generates
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and sends to the server.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</></term>
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<term><option>--interactive</></term>
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<listitem>
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<para>
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Issues a verification prompt before doing anything destructive.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--if-exists</></term>
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<listitem>
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<para>
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Do not throw an error if the database does not exist. A notice is issued
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in this case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-V</></term>
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<term><option>--version</></term>
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<listitem>
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<para>
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Print the <application>dropdb</application> version and exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-?</></term>
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<term><option>--help</></term>
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<listitem>
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<para>
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Show help about <application>dropdb</application> command line
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arguments, and exit.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<application>dropdb</application> also accepts the following
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command-line arguments for connection parameters:
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<variablelist>
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<varlistentry>
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<term><option>-h <replaceable class="parameter">host</replaceable></></term>
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<term><option>--host=<replaceable class="parameter">host</replaceable></></term>
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<listitem>
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<para>
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Specifies the host name of the machine on which the
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server
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is running. If the value begins with a slash, it is used
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as the directory for the Unix domain socket.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p <replaceable class="parameter">port</replaceable></></term>
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<term><option>--port=<replaceable class="parameter">port</replaceable></></term>
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<listitem>
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<para>
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Specifies the TCP port or local Unix domain socket file
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extension on which the server
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is listening for connections.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-U <replaceable class="parameter">username</replaceable></></term>
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<term><option>--username=<replaceable class="parameter">username</replaceable></></term>
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<listitem>
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<para>
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User name to connect as.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-w</></term>
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<term><option>--no-password</></term>
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<listitem>
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<para>
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Never issue a password prompt. If the server requires
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password authentication and a password is not available by
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other means such as a <filename>.pgpass</filename> file, the
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connection attempt will fail. This option can be useful in
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batch jobs and scripts where no user is present to enter a
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password.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-W</></term>
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<term><option>--password</></term>
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<listitem>
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<para>
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Force <application>dropdb</application> to prompt for a
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password before connecting to a database.
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</para>
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<para>
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This option is never essential, since
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<application>dropdb</application> will automatically prompt
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for a password if the server demands password authentication.
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However, <application>dropdb</application> will waste a
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connection attempt finding out that the server wants a password.
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In some cases it is worth typing <option>-W</> to avoid the extra
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connection attempt.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--maintenance-db=<replaceable class="parameter">dbname</replaceable></></term>
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<listitem>
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<para>
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Specifies the name of the database to connect to in order to drop the
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target database. If not specified, the <literal>postgres</literal>
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database will be used; if that does not exist (or is the database
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being dropped), <literal>template1</literal> will be used.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist>
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<varlistentry>
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<term><envar>PGHOST</envar></term>
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<term><envar>PGPORT</envar></term>
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<term><envar>PGUSER</envar></term>
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<listitem>
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<para>
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Default connection parameters
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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This utility, like most other <productname>PostgreSQL</> utilities,
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also uses the environment variables supported by <application>libpq</>
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(see <xref linkend="libpq-envars">).
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</para>
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</refsect1>
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<refsect1>
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<title>Diagnostics</title>
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<para>
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In case of difficulty, see <xref linkend="SQL-DROPDATABASE">
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and <xref linkend="APP-PSQL"> for
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discussions of potential problems and error messages.
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The database server must be running at the
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targeted host. Also, any default connection settings and environment
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variables used by the <application>libpq</application> front-end
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library will apply.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To destroy the database <literal>demo</literal> on the default
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database server:
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<screen>
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<prompt>$ </prompt><userinput>dropdb demo</userinput>
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</screen>
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</para>
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<para>
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To destroy the database <literal>demo</literal> using the
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server on host <literal>eden</literal>, port 5000, with verification and a peek
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at the underlying command:
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<screen>
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<prompt>$ </prompt><userinput>dropdb -p 5000 -h eden -i -e demo</userinput>
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<computeroutput>Database "demo" will be permanently deleted.
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Are you sure? (y/n) </computeroutput><userinput>y</userinput>
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<computeroutput>DROP DATABASE demo;</computeroutput>
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</screen></para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="app-createdb"></member>
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<member><xref linkend="sql-dropdatabase"></member>
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</simplelist>
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</refsect1>
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</refentry>
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