数据库系统

开发平台：
Unix_Linux

destroyuser.sgml：源码内容
							<refentry id="APP-DESTROYUSER">
 <refmeta>
  <refentrytitle>
   <application>destroyuser</application>
  </refentrytitle>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   <application>destroyuser</application>
  </refname>
  <refpurpose>
   Destroy a <productname>Postgres</productname> user and associated databases
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1998-10-02</date>
  </refsynopsisdivinfo>
  <synopsis>
destroyuser [ <replaceable class="parameter">username</replaceable> ]
destroyuser [ -h <replaceable class="parameter">host</replaceable> ] [ -p <replaceable class="parameter">port</replaceable> ]
    [ <replaceable class="parameter">username</replaceable> ]
  </synopsis>
  <refsect2 id="R2-APP-DESTROYUSER-1">
   <refsect2info>
    <date>1998-10-02</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term>-h <replaceable class="parameter">host</replaceable></term>
      <listitem>
       <para>
	Specifies the hostname of the machine on which the 
	<application>postmaster</application>
	is running.  Defaults to using a local Unix domain socket
	rather than an IP connection.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term>-p <replaceable class="parameter">port</replaceable></term>
      <listitem>
       <para>
	Specifies the Internet TCP/IP port or local Unix domain socket file 
	extension on which the <application>postmaster</application>
	is listening for connections.  The port number defaults to 5432,
	or the value of the <envar>PGPORT</envar>
	environment variable (if set).
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><replaceable class="parameter">username</replaceable></term>
      <listitem>
       <para>
	Specifies the name of the <productname>Postgres</productname> user to be removed. 
	This name must exist in the <productname>Postgres</productname> installation.
	You will be prompted for a name if none is specified on the command line.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
  <refsect2 id="R2-APP-DESTROYUSER-2">
   <refsect2info>
    <date>1998-10-02</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>
    <application>destroyuser</application> will remove an entry in the
    <literal>pg_user</literal> or <literal>pg_shadow</literal> system table,
    and will remove all databases for which that user is the administrator
    (<acronym>DBA</acronym>).
    <variablelist>
     <varlistentry>
      <term><computeroutput>
Connection to database 'template1' failed.
connectDB() failed: Is the postmaster running and accepting connections
            at 'UNIX Socket' on port '<replaceable class="parameter">port</replaceable>'?
destroyuser: database access failed.
       </computeroutput></term>
      <listitem>
       <para>
	<application>destroyuser</application> could not attach to the 
	<application>postmaster</application> 
	process on the specified host and port.  If you see this message,
	ensure that the <application>postmaster</application> 
	is running on the proper host and that you have specified the proper
	port.  If your site uses an authentication system, ensure that you
	have obtained the required authentication credentials.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
Connection to database 'template1' failed.
FATAL 1:  SetUserId: user '<replaceable class="parameter">username</replaceable>' is not in 'pg_shadow'
destroyuser: database access failed.
      </computeroutput></term>
      <listitem>
       <para>
	You do not have a valid entry in the relation <literal>pg_shadow</literal>
	and and will not be allowed to access <productname>Postgres</productname>. Contact your
	<productname>Postgres</productname> administrator.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
destroyuser: <replaceable class="parameter">username</replaceable> cannot delete users.
      </computeroutput></term>
      <listitem>
       <para>
	You do not have permission to delete users; contact your
	<productname>Postgres</productname> site administrator.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
destroyuser: user "<replaceable class="parameter">username</replaceable>" already exists
      </computeroutput></term>
      <listitem>
       <para>
	The user to be added already has an entry in the
	<literal>pg_shadow</literal> class.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
database access failed
      </computeroutput></term>
      <listitem>
       <para>
	An internal error occurred in <application>psql</application>
	or in the backend server.  Ensure that your site administrator has
	properly installed <productname>Postgres</productname>and initialized the site with 
	<application>initdb</application>.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
destroydb on <replaceable class="parameter">dbname</replaceable> failed - exiting
      </computeroutput></term>
      <listitem>
       <para>
	An internal error occurred in <application>psql</application>
	or in the backend server. There was possibly a Unix permissions problem with the
	specified database.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
delete of user <replaceable class="parameter">username</replaceable> was UNSUCCESSFUL
       </computeroutput></term>
      <listitem>
       <para>
	An internal error occurred in <application>psql</application>
	or in the backend server.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
   <note>
    <para>
     <application>destroyuser</application> internally runs
     <command>DROP USER</command> from <application>psql</application>
     while connected to the <literal>template1</literal> database.
    </para>
   </note>
  </refsect2>
 </refsynopsisdiv>
 <refsect1 id="R1-APP-DESTROYUSER-1">
  <refsect1info>
   <date>1998-10-02</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <application>destroyuser</application> removes an existing
   <productname>Postgres</productname> user
   and the databases for which that user
   is database administrator.
   Only users with <literal>usesuper</literal> set in
   the <literal>pg_shadow</literal> class can destroy 
   <productname>Postgres</productname> users.  As shipped,
   the user <literal>postgres</literal> can remove users.
  </para>
  <para>
   <application>destroyuser</application> is a shell script that invokes
   <application>psql</application>.
   Hence, a <application>postmaster</application>
   process must be running on the database server host before
   <application>destroyuser</application> is executed.
   The 
   <envar>PGOPTION</envar>
   and
   <envar>PGREALM</envar>
   environment variables will be passed on to
   <application>psql</application>
   and processed as described in <xref endterm="psql-ref"
    linkend="app-psql">.
  </para>
  <para>
   Once invoked, <application>destroyuser</application>
   will warn you about the databases that will be destroyed in the
   process and permit you to abort the removal of the user if desired.
  </para>
 </refsect1>
</refentry>
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