| From: | adey <adey11(at)gmail(dot)com> |
|---|---|
| To: | "Michael Fuhr" <mike(at)fuhr(dot)org> |
| Cc: | "Milen A(dot) Radev" <milen(at)radev(dot)net>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Lock Statistics |
| Date: | 2007-07-31 03:13:14 |
| Message-ID: | 1c66bda80707302013xca6c726gc981ca52f4d562d0@mail.gmail.com |
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| Lists: | pgsql-admin |
On 7/31/07, Michael Fuhr <mike(at)fuhr(dot)org> wrote:
>
> On Tue, Jul 31, 2007 at 10:35:25AM +1200, adey wrote:
> > -- CAUTION: this query may impact system performance as you are
> selecting
> > from system tables
>
> What difference are you expecting that to make and why?
It was a warning I received some years ago when I riginally discovered the
query. Presumably reading from system tables competes with user queries for
the system tables, slowing them down. I can't say I've ever noticed any
impact when using it though.
--
> Michael Fuhr
>
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