SQL

job for postgresql.service failed because the control process exited with error code. see "systemctl status postgresql.service" and "journalctl -xe" for details.

ps- ef | grep postgres 
// And get the postgres process id and kill all postgres processes.

// Remove the 9.3 data directory using

rm -rf /var/lib/pgsql/9.3
// Go to /usr/pgsql-9.2/bin and run the initdb using below command

./postgresql92-setup initdb
// After that start the postgresql-9.2 service using

// systemctl start postgresql-9.2.service