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8e5793ab60
When told to process all databases, clusterdb, reindexdb, and vacuumdb
would reconnect by replacing their --maintenance-db parameter with the
name of the target database. If that parameter is a connstring (which
has been allowed for a long time, though we failed to document that
before this patch), we'd lose any other options it might specify, for
example SSL or GSS parameters, possibly resulting in failure to connect.
Thus, this is the same bug as commit a45bc8a4f fixed in pg_dump and
pg_restore. We can fix it in the same way, by using libpq's rules for
handling multiple "dbname" parameters to add the target database name
separately. I chose to apply the same refactoring approach as in that
patch, with a struct to handle the command line parameters that need to
be passed through to connectDatabase. (Maybe someday we can unify the
very similar functions here and in pg_dump/pg_restore.)
Per Peter Eisentraut's comments on bug #16604. Back-patch to all
supported branches.
Discussion: https://postgr.es/m/16604-933f4b8791227b15@postgresql.org
318 lines
9.0 KiB
Plaintext
318 lines
9.0 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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<indexterm zone="app-dropdb">
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<primary>dropdb</primary>
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</indexterm>
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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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<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 <link linkend="sql-dropdatabase"><command>DROP DATABASE</command></link>.
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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</application> 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</option></term>
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<term><option>--echo</option></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>-f</option></term>
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<term><option>--force</option></term>
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<listitem>
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<para>
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Attempt to terminate all existing connections to the target database
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before dropping it. See <xref linkend="sql-dropdatabase"/> for more
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information on this option.
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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</option></term>
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<term><option>--interactive</option></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>-V</option></term>
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<term><option>--version</option></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>--if-exists</option></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>-?</option></term>
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<term><option>--help</option></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></option></term>
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<term><option>--host=<replaceable class="parameter">host</replaceable></option></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></option></term>
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<term><option>--port=<replaceable class="parameter">port</replaceable></option></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></option></term>
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<term><option>--username=<replaceable class="parameter">username</replaceable></option></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</option></term>
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<term><option>--no-password</option></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</option></term>
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<term><option>--password</option></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</option> 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></option></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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This can be a <link linkend="libpq-connstring">connection
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string</link>. If so, connection string parameters will override any
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conflicting command line options.
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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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<varlistentry>
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<term><envar>PG_COLOR</envar></term>
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<listitem>
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<para>
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Specifies whether to use color in diagnostic messages. Possible values
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are <literal>always</literal>, <literal>auto</literal> and
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<literal>never</literal>.
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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</productname> utilities,
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also uses the environment variables supported by <application>libpq</application>
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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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