PosgreSQL

sudo-s (root into the folder)

export PGDATA=/var/lib/pgsql/9.6/data

Restart postgres: ./pg_ctl restart

 

 

/var/lib/pgsql/data

 

/usr/bin/pg_ctl   /usr/pgsql-9.6/bin/pg_ctl

 

 postgres change password

 

sudo su postgres

psql

alter user postgres with password 'new password';  

 

psql reads the .sql file and initializes the database

psql -d qing_lapp -f /data/init.sql 

psql modify field type ALTER TABLE tbl_name ALTER COLUMN col_name TYPE varchar (11);

 

 

 

Postgres installation steps:

yum install postgresql-server (pg will be installed by the way)

service postgresql initdb (initialize database, and configuration file)

Then modify pg_hba.conf and postgresql.conf under data

 

Some addresses of pg_hba.conf do not support all, you can write 0.0.0.0/0 or not write all, it is safe