# Upgrading PostgreSQL Database

when major release of postgresql is done you need to do some manual action
if not done you can meet issue during request

## action

**need to have postgresqk-old-upgrade installed on arch**

- stop service
```systemctl stop postgresql.service```
- rename cluster directory
```mv /var/lib/postgres/data /var/lib/postgres/olddata
mkdir /var/lib/postgres/data /var/lib/postgres/tmp
chown postgres:postgres /var/lib/postgres/data /var/lib/postgres/tmp
```
- log in postgres account
```
sudo -iu postgres
cd /var/lib/postgres/tmp

```
- launch upgrade
```
pg_upgrade -b /opt/pgsql-PG_VERSION/bin -B /usr/bin -d /var/lib/postgres/olddata -D /var/lib/postgres/data
```
- check both pg_hba.conf in new  and old cluster
- restart server `sc-start postgresql`