On Fri, Jul 11, 2014 at 12:12 PM, Michael Banck wrote:
> On Fri, Jul 11, 2014 at 11:07:21AM -0400, Tom Lane wrote:
> > David G Johnston writes:
> > > Benedikt Grundmann wrote
> > >> That is it possible to tell the planner that index is off limits
> > >> i.e.
> > >> don't ever generate a plan usi
On Fri, Jul 11, 2014 at 11:07:21AM -0400, Tom Lane wrote:
> David G Johnston writes:
> > Benedikt Grundmann wrote
> >> That is it possible to tell the planner that index is off limits
> >> i.e.
> >> don't ever generate a plan using it?
>
> > Catalog hacking could work but not recommended (nor do
Andres Freund writes:
> On 2014-07-11 11:20:08 -0400, Tom Lane wrote:
>> If you're talking about SnapshotNow hazards, I think the risk would be
>> minimal, and probably no worse than cases that the system will cause
>> by itself.
> Yes, SnapshotNow. I could reproduce it causing 'spurious' HOT upd
On 2014-07-11 11:20:08 -0400, Tom Lane wrote:
> Andres Freund writes:
> > On 2014-07-11 11:07:21 -0400, Tom Lane wrote:
> >> Hacking pg_index.indisvalid could work, given a reasonably recent PG.
> >> I would not try it in production until I'd tested it ;-)
>
> > Works, but IIRC can cause problems
Andres Freund writes:
> On 2014-07-11 11:07:21 -0400, Tom Lane wrote:
>> Hacking pg_index.indisvalid could work, given a reasonably recent PG.
>> I would not try it in production until I'd tested it ;-)
> Works, but IIRC can cause problems at least < 9.4 because concurrent
> cache builds might mi
On 2014-07-11 11:07:21 -0400, Tom Lane wrote:
> David G Johnston writes:
> > Benedikt Grundmann wrote
> >> That is it possible to tell the planner that index is off limits i.e.
> >> don't ever generate a plan using it?
>
> > Catalog hacking could work but not recommended (nor do I know the proper
David G Johnston writes:
> Benedikt Grundmann wrote
>> That is it possible to tell the planner that index is off limits i.e.
>> don't ever generate a plan using it?
> Catalog hacking could work but not recommended (nor do I know the proper
> commands and limitations). Do you need the database/ta
Benedikt Grundmann wrote
> That is it possible to tell the planner that index is off limits i.e.
> don't
> ever generate a plan using it?
>
> Rationale: Schema changes on big tables. I might have convinced myself /
> strong beliefs that for all queries that I need to be fast the planner
> does
>
That is it possible to tell the planner that index is off limits i.e. don't
ever generate a plan using it?
Rationale: Schema changes on big tables. I might have convinced myself /
strong beliefs that for all queries that I need to be fast the planner does
not need to use a given index (e.g. othe
