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Thread: Trigger function on Warm Standby

Trigger function on Warm Standby

From
ning chan
Date:
Hi all,

I have a Primary Standby setup with streaming replication.
Trigger is created on a table, and all it does it to log a message.

The trigger works as expected on Primary, however, I don't see the same on standby.

I alter the table to have ENABLE ALWAYS TRIGGER, I verified the setting on both Primary and Standby which is set to A.

Standby:
-bash-4.1$ psql -c "select tgrelid, tgname, tgenabled from pg_trigger where tgname='processnodeafter'"
 tgrelid |      tgname      | tgenabled
---------+------------------+-----------
   19218 | processnodeafter | A

Primary:
postgres=# select tgrelid, tgname, tgenabled from pg_trigger where tgname='processnodeafter';
 tgrelid |      tgname      | tgenabled
---------+------------------+-----------
   19218 | processnodeafter | A
(1 row)

Can someone tell me if the trigger will never happen on the Standby server? Is it expected or am I missing some other settings?

Thanks~
Ning

Re: Trigger function on Warm Standby

From
Jerry Sievers
Date:
ning chan <ninchan8328@gmail.com> writes:

> Hi all,
>
> I have a Primary Standby setup with streaming replication.
> Trigger is created on a table, and all it does it to log a message.
>
> The trigger works as expected on Primary, however, I don't see the same on standby.
>
> I alter the table to have ENABLE ALWAYS TRIGGER, I verified the setting on both Primary and Standby which is set to
A.
>
> Standby:
> -bash-4.1$ psql -c "select tgrelid, tgname, tgenabled from pg_trigger where tgname='processnodeafter'"
> ?tgrelid |????? tgname????? | tgenabled
> ---------+------------------+-----------
> ?? 19218 | processnodeafter | A
>
> Primary:
> postgres=# select tgrelid, tgname, tgenabled from pg_trigger where tgname='processnodeafter';
> ?tgrelid |????? tgname????? | tgenabled
> ---------+------------------+-----------
> ?? 19218 | processnodeafter | A
> (1 row)
>
> Can someone tell me if the trigger will never happen on the Standby server? Is it expected or am I missing some other
> settings?

It will not fire on a standby.

> Thanks~
> Ning
>

--
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800