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       clusterdb - cluster a PostgreSQL database


       clusterdb  [  connection-option...  ]   [   [ --verbose ]  [ -v ]  ]  [
       --table | -t table  ]  [ dbname ]

       clusterdb [ connection-option... ]  [  [ --all ]   [  -a  ]   ]   [   [
       --verbose ]  [ -v ]  ]


       clusterdb  is  a  utility  for  reclustering  tables  in  a  PostgreSQL
       database. It finds tables that  have  previously  been  clustered,  and
       clusters  them  again on the same index that was last used. Tables that
       have never been clustered are not affected.

       clusterdb is a wrapper around the  SQL  command  CLUSTER  [cluster(7)].
       There  is no effective difference between clustering databases via this
       utility and via other methods for accessing the server.


       clusterdb accepts the following command-line arguments:


       --all  Cluster all databases.

       [-d] dbname

       [--dbname] dbname
              Specifies the name of the database to be clustered.  If this  is
              not  specified  and -a (or --all) is not used, the database name
              is read from the environment variable PGDATABASE. If that is not
              set, the user name specified for the connection is used.


       --echo Echo  the  commands  that  clusterdb  generates and sends to the


              Do not display progress messages.

       -t table

       --table table
              Cluster table only.


              Print detailed information during processing.

       clusterdb  also  accepts  the  following  command-line  arguments   for
       connection parameters:

       -h host

       --host host
              Specifies  the  host  name of the machine on which the server is
              running. If the value begins with a slash, it  is  used  as  the
              directory for the Unix domain socket.

       -p port

       --port port
              Specifies  the  TCP  port  or  local  Unix  domain  socket  file
              extension on which the server is listening for connections.

       -U username

       --username username
              User name to connect as.


              Never issue a password prompt. If the server  requires  password
              authentication  and  a  password is not available by other means
              such as a .pgpass file, the connection attempt will  fail.  This
              option  can be useful in batch jobs and scripts where no user is
              present to enter a password.


              Force clusterdb to prompt for a password before connecting to  a

              This   option   is   never   essential,   since  clusterdb  will
              automatically prompt  for  a  password  if  the  server  demands
              password   authentication.   However,  clusterdb  will  waste  a
              connection attempt finding out that the server wants a password.
              In  some  cases  it  is  worth  typing  -W  to  avoid  the extra
              connection attempt.





       PGUSER Default connection parameters

       This utility, like most  other  PostgreSQL  utilities,  also  uses  the
       environment variables supported by libpq (see in the documentation).


       In  case  of  difficulty,  see  CLUSTER  [cluster(7)]  and  psql(1) for
       discussions of potential problems and  error  messages.   The  database
       server  must  be  running  at  the  targeted  host.  Also,  any default
       connection settings and environment variables used by the libpq  front-
       end library will apply.


       To cluster the database test:

       $ clusterdb test

       To cluster a single table foo in a database named xyzzy:

       $ clusterdb --table foo xyzzy


       CLUSTER [cluster(7)]