59 lines
1.0 KiB
Markdown
59 lines
1.0 KiB
Markdown
# Upgrading PostgreSQL Database
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when major release of postgresql is done you need to do some manual action
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if not done you can meet issue during request
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## action
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need to have **postgresqk-old-upgrade** installed on arch
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- stop service
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```systemctl stop postgresql.service```
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- rename cluster directory
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```bash
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mv /var/lib/postgres/data /var/lib/postgres/olddata
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mkdir /var/lib/postgres/data /var/lib/postgres/tmp
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chown postgres:postgres /var/lib/postgres/data /var/lib/postgres/tmp
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```
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- log in postgres account
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```bash
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sudo -iu postgres
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cd /var/lib/postgres/tmp
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```
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- launch upgrade
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```bash
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pg_upgrade -b /opt/pgsql-PG_VERSION/bin -B /usr/bin -d /var/lib/postgres/olddata -D /var/lib/postgres/data
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```
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- check both pg_hba.conf in new and old cluster
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- restart server `sc-start postgresql`
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## sequece manipulation
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sequence are use to generate uniq identifier
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- get sequence value
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```SQL
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select * from name_seq;
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```
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- increment sequence value
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```SQL
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select nextval(name_seq);
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```
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- set sequence value:
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```SQL
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select setval(name_seq,newvalue);
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```
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