What is difference between pg_ctl and systemctl in PostgreSQL

In this article, we will see the difference between pg_ctl and systemctl in PostgreSQL.

Difference between pg_ctl and systemctl in PostgreSQL

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How to start stop PostgreSQL server using pg_ctl

In this article, we will see how to start stop PostgreSQL server using pg_ctl.

We can start or stop or promote PostgreSQL server(cluster) by using following three methods.

1. Using pg_ctl
2. Using Systemctl
3. Using service

Last two methods are straight forward.

How to start stop restart PostgreSQL server using pg_ctl

pg_ctl is the utility used to start stop status or promote/failover of PostgreSQL cluster(server).
To use pg_ctl to start the PostgreSQL, we must have an already existing or newly initialized data directory.
We have to use PostgreSQL server data directory location while using pg_ctl.

Before going to examples, set the PostgreSQL environment variables using this link

Syntax of pg_ctl: Continue reading How to start stop PostgreSQL server using pg_ctl

How to find the PostgreSQL server uptime

In this article, we will see how to find the PostgreSQL server uptime. To find the PstgreSQL server uptime, we use PostgreSQL built-in function pg_postmaster_start_time(). Or by checking the time host and postgresql server start time.

Find the PostgreSQL server uptime

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PostgreSQL Server Shutdown modes

In this article, we will different PostgreSQL Server Shutdown modes.

Like other RDMS, in PostgreSQL also there are threes modes in which a shutdown can be performed.

1. Smart Mode
2. Fast Mode
3. Immediate Mode

Continue reading PostgreSQL Server Shutdown modes