Kevin Brown wrote:
>>Hints are dangerous, and I consider them a last resort.
>
> If you consider them a last resort, then why do you consider them to
> be a better alternative than a workaround such as turning off
> enable_seqscan, when all the other tradeoffs are considered?
If I understand enable_seqscan, it's an all-or-nothing affair. Turning it off turns it off for the whole database,
right? The same is true of all of the planner-tuning parameters in the postgres conf file. Since the optimizer does a
goodjob most of the time, I'd hate to change a global setting like this -- what else would be affected? I could try
this,but it would make me nervous to alter the whole system to fix one particular query.
> If your argument is that planner hints would give you finer grained
> control, then the question is whether you'd rather the developers
> spend their time implementing planner hints or improving the planner.
I agree 100% -- I'd much prefer a better planner. But when it comes down to a do-or-die situation, you need a hack,
somesort of workaround, to get you working *today*.
Regards,
Craig
