Re: Serializable isolation -- are predicate locks still held across all databases?

On Fri, 19 May 2017 01:52:00 -0500
"Karl O. Pinc" <kop(at)meme(dot)com> wrote:

> On Thu, 18 May 2017 12:04:42 -0500
> Kevin Grittner <kgrittn(at)gmail(dot)com> wrote:
>
> > On Thu, May 18, 2017 at 11:07 AM, Karl O. Pinc <kop(at)meme(dot)com> wrote:
> >
> > > ... Does PG
> > > now pay attention to database in it's SSI implementation?
> >
> > Well, it pays attention as far as the scope of each lock, but there
> > is only one variable to track how far back the oldest transaction ID
> > for a running serializable transaction goes, which is used in
> > cleanup of old locks.

> > ... It's the
> > first time I've heard of someone with this particular issue, so at
> > this point I'm inclined to recommend the workaround of using a
> > separate cluster

I think if I was to make an argument for doing something it would
be based on reliability -- how many users can you give their
own database before somebody leaves an open transaction hanging?

Karl <kop(at)meme(dot)com>
Free Software: "You don't pay back, you pay forward."
-- Robert A. Heinlein