Add README file.

contrib/pg_upgrade/README

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+PG_UPGRADE(1)     PostgreSQL Client Applications    PG_UPGRADE(1)
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+NNAAMMEE
+       pg_upgrade - upgrade tool
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+SSYYNNOOPPSSIISS
+       Allows upgrading from a previous release without reloading
+       data
+
+DDEESSCCRRIIPPTTIIOONN
+       pg_upgrade is a utility  for  upgrading  from  a  previous
+       PostgreSQL release without reloading all the data. Not all
+       PostgreSQL releases can be handled this  way.   Check  the
+       release notes for details about your version.
+
+       pg_upgrade  must  be  run in two stages.  In phase one you
+       must run pg_upgrade with your old database installation in
+       place.   In phase two, pg_upgrade must be run on a freshly
+       initdb'ed current  install.   In  both  phases,  the  same
+       pg_upgrade  script  matching  the  newly installed version
+       must be used.
+
+UUppggrraaddiinngg PPoossttggrreeSSQQLL wwiitthh ppgg__uuppggrraaddee
+       1) Back up your existing  data  directory,  preferably  by
+       making a complete dump with pg_dumpall.
+
+       2)  Copy  the  program _p_g_s_q_l_/_c_o_n_t_r_i_b_/_p_g___u_p_g_r_a_d_e_/_p_g___u_p_g_r_a_d_e
+       from the current PostgreSQL  distribution  somewhere  into
+       your path.
+
+       3)  Change your working directory to the pgsql main direc-
+       tory, and type:
+
+       $$ ppgg__uuppggrraaddee --11
+
+       to collect information about the old database  needed  for
+       the upgrade.
+
+       4) Do:
+
+       $$ mmaakkee iinnssttaallll
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+       to install the new binaries.
+
+       5)  Do:
+
+       $$ ccdd ppggssqqll//ccoonnttrriibb//ppgg__rreesseettxxlloogg
+       $$ mmaakkee iinnssttaallll
+
+       to  install  the  _p_g___r_e_s_e_t_x_l_o_g  utility which is needed by
+       pg_upgrade.
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+       6) Run initdb to create a new template1 database  contain-
+       ing  the system tables for the new release.  Make sure you
+       use settings similar to those used in your  previous  ver-
+       sion.
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+14 Jan 2002               PG_UPGRADE(1)                         1
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+PG_UPGRADE(1)     PostgreSQL Client Applications    PG_UPGRADE(1)
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+       7)  Start  the new _p_o_s_t_m_a_s_t_e_r_.  (Note: it is critical that
+       no users connect to the server until the upgrade  is  com-
+       plete.  You may wish to start the postmaster without -i or
+       alter pg_hba.conf temporarily.)
+
+       8)  Change your working directory to the pgsql main direc-
+       tory, and type:
+
+       $$ ppgg__uuppggrraaddee --22
+
+       The  program will do some checking to make sure everything
+       is properly configured, and will  then  recreate  all  the
+       databases  and  tables you had, but with no data.  It will
+       then physically move the data files containing  non-system
+       tables and indexes into the proper subdirectories.
+
+       9)   Restore  your old _p_g___h_b_a_._c_o_n_f if needed to allow user
+       logins.
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+       10)   Carefully  examine  the  contents  of  the  upgraded
+       databases.  If you detect problems, you'll need to recover
+       by restoring from your full pg_dump backup. You can delete
+       the _p_g___u_p_g_r_a_d_e___i_n_f_o_/ directory when you are satisfied.
+
+       The  upgraded  databases  will be in an un-vacuumed state.
+       You will probably want to  run  a  _V_A_C_U_U_M  _A_N_A_L_Y_Z_E  bbeeffoorree
+       bbeeggiinnnniinngg pprroodduuccttiioonn wwoorrkk..
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+SSEEEE AALLSSOO
+       initdb(1), postmaster(1), pg_dump(1), pg_dumpall(1), vacu-
+       umdb(1)
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+14 Jan 2002               PG_UPGRADE(1)                         2
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