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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: abctevez <swqshapu@163.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: does the notification of postgres appear in transaction completed order
Date: Fri, 16 Mar 2018 10:57:19 -0400
Message-ID: <19761.1521212239@sss.pgh.pa.us> (raw)
In-Reply-To: <3bc63b9d.f064.1622f0c0a46.Coremail.swqshapu@163.com>
References: <3bc63b9d.f064.1622f0c0a46.Coremail.swqshapu@163.com>
abctevez <swqshapu@163.com> writes:
> I want to use notify/listen to catch the message that a transaction completed.Fire notify in trigger and as the official said, it won't notify if transaction rollback.However, I am wondering if the message appear in the same order with transaction execution.I couldn't find this topic on the official web or just I missed it?
https://www.postgresql.org/docs/current/static/sql-notify.html
says
Except for dropping later instances of duplicate notifications, NOTIFY
guarantees that notifications from the same transaction get delivered
in the order they were sent. It is also guaranteed that messages from
different transactions are delivered in the order in which the
transactions committed.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, swqshapu@163.com
Subject: Re: does the notification of postgres appear in transaction completed order
In-Reply-To: <19761.1521212239@sss.pgh.pa.us>
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