pg_upgrade upgrades a PostgreSQL cluster to a different major version.

Usage:
  pg_upgrade [OPTION]...

Options:
  -b, --old-bindir=BINDIR       old cluster executable directory
  -B, --new-bindir=BINDIR       new cluster executable directory (default
                                same directory as pg_upgrade)
  -c, --check                   check clusters only, don't change any data
  -d, --old-datadir=DATADIR     old cluster data directory
  -D, --new-datadir=DATADIR     new cluster data directory
  -j, --jobs=NUM                number of simultaneous processes or threads to use
  -k, --link                    link instead of copying files to new cluster
  -N, --no-sync                 do not wait for changes to be written safely to disk
  -o, --old-options=OPTIONS     old cluster options to pass to the server
  -O, --new-options=OPTIONS     new cluster options to pass to the server
  -p, --old-port=PORT           old cluster port number (default 50432)
  -P, --new-port=PORT           new cluster port number (default 50432)
  -r, --retain                  retain SQL and log files after success
  -s, --socketdir=DIR           socket directory to use (default current dir.)
  -U, --username=NAME           cluster superuser (default "postgres")
  -v, --verbose                 enable verbose internal logging
  -V, --version                 display version information, then exit
  --clone                       clone instead of copying files to new cluster
  --copy                        copy files to new cluster (default)
  -?, --help                    show this help, then exit

Before running pg_upgrade you must:
  create a new database cluster (using the new version of initdb)
  shutdown the postmaster servicing the old cluster
  shutdown the postmaster servicing the new cluster

When you run pg_upgrade, you must provide the following information:
  the data directory for the old cluster  (-d DATADIR)
  the data directory for the new cluster  (-D DATADIR)
  the "bin" directory for the old version (-b BINDIR)
  the "bin" directory for the new version (-B BINDIR)

For example:
  pg_upgrade -d oldCluster/data -D newCluster/data -b oldCluster/bin -B newCluster/bin
or
  C:\> set PGDATAOLD=oldCluster/data
  C:\> set PGDATANEW=newCluster/data
  C:\> set PGBINOLD=oldCluster/bin
  C:\> set PGBINNEW=newCluster/bin
  C:\> pg_upgrade

Report bugs to <pgsql-bugs@lists.postgresql.org>.
PostgreSQL home page: <https://www.postgresql.org/>