notebook/IT/SQL/PostgreSQL/Upgrade.md
2021-04-20 23:13:14 +02:00

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# 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
```bash
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
```bash
sudo -iu postgres
cd /var/lib/postgres/tmp
```
- launch upgrade
```bash
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`
## sequece manipulation
sequence are use to generate uniq identifier
- get sequence value
```SQL
select * from name_seq;
```
- increment sequence value
```SQL
select nextval(name_seq);
```
- set sequence value:
```SQL
select setval(name_seq,newvalue);
```