Using PostgreSQL 12.12 pg_ commands in Ubuntu 20.04 not working

ronald

11/11/23, 5:58 AM

I've installed PostGreSQL 12.12 with:

sudo apt install postgresql postgresql-contrib libpq-dev

But I'm seeing errors with pg_ commands. For example, this is the error when trying to setup replication:

postgres-# pg_create_physical_replication_slot wallinfo, immediately_reserve true, temporary true;  
ERROR:  syntax error at or near "pg_create_physical_replication_slot"

LINE 1: pg_create_physical_replication_slot wallinfo, immediately_re...  
       ^  
The error is the first letter p from pg_

What can I do to enable the pg_ commands.

I've checked:

> whereis ruby
ruby: /usr/bin/ruby2.7 /usr/bin/ruby /usr/lib/x86_64-linux-gnu/ruby /usr/lib/ruby /usr/share/man/man1/ruby.1.gz

But I'm still encounter errors when using the pg_ commands in psql.

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matigo

11/11/23, 6:08 AM

Replication is typically configured by editing the `postgresql.conf` and `pg_hba.conf` files. Are you trying to build a very specific sort of replication?

ronald

11/11/23, 6:16 AM

postgresql.conf and pg_hba.conf is needed for communication, to setup the WAL files I need to configure the database to make things possible

matigo

11/11/23, 6:49 AM

Ah, I see what you're doing now. Those `pg_` objects are functions, so you need to wrap them in a `SELECT`. For example: `SELECT * FROM pg_create_physical_replication_slot('standby1_slot');`

ronald

11/11/23, 9:09 AM

@matigo the official command is pg_create_physical_replication_slot(slot_name name [, immediately_reserve boolean, temporary boolean]) as input I changed the line to pg_create_physical_replication_slot (slot_name wallinfo, immediately_reserve true, temporary true); stil the error point to the p from pg_

ronald

11/12/23, 8:42 AM

The answer is that pg_create is not present in the /usr/lib/postgresql/12/main directory and therefore can't be executed.

Score:-1

Ubuntu

ronald

11/14/23, 9:05 AM

The answer is that pg_create is not present in the /usr/lib/postgresql/12/main directory and therefore can't be executed.

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