NAME

       pg_controldata - display control information of a Coordinator or a Datanode of a
       Postgres-XC database cluster

SYNOPSIS

       pg_controldata [option] [datadir]

DESCRIPTION

       pg_controldata prints information initialized during initdb, such as the catalog version.
       It also shows information about write-ahead logging and checkpoint processing. This
       information is cluster-wide, and not specific to any one database.

       This utility can only be run by the user who initialized the cluster because it requires
       read access to the data directory. You can specify the data directory on the command line,
       or use the environment variable PGDATA. This utility supports the options -V and
       --version, which print the pg_controldata version and exit. It also supports options -?
       and --help, which output the supported arguments.

           Note
           The following description applies only to Postgres-XC

       To print information of each Datanode and Coordinator, you should issue pg_controldata
       against each of them.

ENVIRONMENT

       PGDATA
           Default data directory location