Re: select for update not locking properly.

From: Joseph Shraibman <jks(at)selectacast(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "pgsql-general(at)hub(dot)org" <pgsql-general(at)hub(dot)org>, "pgsql-interfaces(at)postgreSQL(dot)org" <pgsql-interfaces(at)postgreSQL(dot)org>
Subject: Re: select for update not locking properly.
Date: 2000-07-13 18:43:20
Message-ID: 396E0DC8.D8CDF135@selectacast.net
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general pgsql-interfaces

Damn, I though having seperate Statement objects was supposed to take
care of that.

Peter can you confirm this?

Tom Lane wrote:
>
> Joseph Shraibman <jks(at)selectacast(dot)net> writes:
> > OK here is the test program.
>
> I don't know Java hardly at all, but it looks like you've got ten
> threads in Java all issuing commands through a *single* connection
> to a single backend. Postgres isn't going to lock those threads
> against each other for you ... it has no idea whatever that the
> sequence of commands it's seeing aren't all from one thread.
>
> You'd need to have ten separate connections to ten separate backends
> to get the behavior you're expecting. Try putting the Connection
> objects into the Adder objects and firing them up at Adder creation.
>
> regards, tom lane

In response to

Browse pgsql-general by date

  From Date Subject
Next Message ernie cline 2000-07-13 18:53:33 Re: performance question
Previous Message Tom Lane 2000-07-13 18:39:16 Re: performance question

Browse pgsql-interfaces by date

  From Date Subject
Next Message Joseph Shraibman 2000-07-13 21:29:23 How do I use connection pooling?
Previous Message Tom Lane 2000-07-13 18:35:35 Re: select for update not locking properly.