Re: Avoiding bad prepared-statement plans.

[Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>]

Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Fri, Feb 26, 2010 at 7:03 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Wouldn't it be better if it just did the right thing automatically?
>> 
>> The sort of heuristic I'm envisioning would essentially do "replan every
>> time" for some number of executions, and give up only if it noticed that
>> it wasn't getting anything better than the generic plan.  So you'd have
>> a fixed maximum overhead per session when the custom plan was useless,
>> and the Right Thing when it wasn't.

> Which is likely useless for my use case.

[ shrug... ]  You'd better explain exactly why, if you want me to take
that objection seriously.

			regards, tom lane