Re: [PERFORM] Hints proposal

From: Zeugswetter Andreas ADI SD
Subject: Re: [PERFORM] Hints proposal
Date: ,
Msg-id: E1539E0ED7043848906A8FF995BDA579016A0ADC@m0143.s-mxs.net
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In response to: Re: [PERFORM] Hints proposal  (Andrew Sullivan)
List: pgsql-hackers

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Re: [PERFORM] Hints proposal  (Tom Lane, )
 Re: [PERFORM] Hints proposal  ("Merlin Moncure", )
 Re: [PERFORM] Hints proposal  ("Jim C. Nasby", )
  Re: [PERFORM] Hints proposal  (Tom Lane, )
  Re: [PERFORM] Hints proposal  (Josh Berkus, )
   Re: [PERFORM] Hints proposal  ("Jim C. Nasby", )
    Re: [PERFORM] Hints proposal  (Josh Berkus, )
     Re: [PERFORM] Hints proposal  ("Bucky Jordan", )
      Re: [PERFORM] Hints proposal  (Alvaro Herrera, )
       Re: [PERFORM] Hints proposal  (Jeff Davis, )
        Re: [PERFORM] Hints proposal  ("Bucky Jordan", )
         Re: [PERFORM] Hints proposal  (Jeff Davis, )
          Re: [PERFORM] Hints proposal  ("Jim C. Nasby", )
           Re: [PERFORM] Hints proposal  ("Joshua D. Drake", )
            Re: [PERFORM] Hints proposal  (Andrew Dunstan, )
           Re: [PERFORM] Hints proposal  (David Fetter, )
           Re: [PERFORM] Hints proposal  (Jeff Davis, )
           Re: [PERFORM] Hints proposal  (Stefan Kaltenbrunner, )
     Re: [PERFORM] Hints proposal  ("Jim C. Nasby", )
      Re: [PERFORM] Hints proposal  (Tom Lane, )
      Re: [PERFORM] Hints proposal  ("Bucky Jordan", )
      Re: [PERFORM] Hints proposal  (Josh Berkus, )
       Re: [PERFORM] Hints proposal  ("Jim C. Nasby", )
        Re: [PERFORM] Hints proposal  (Alvaro Herrera, )
        Re: [PERFORM] Hints proposal  (Tom Lane, )
     Re: [PERFORM] Hints proposal  (Gregory Stark, )
      Re: [PERFORM] Hints proposal  (Robert Treat, )
   Re: [PERFORM] Hints proposal  ("Zeugswetter Andreas ADI SD", )
    Re: [PERFORM] Hints proposal  (Josh Berkus, )
  Re: [PERFORM] Hints proposal  (Andrew Sullivan, )
   Re: [PERFORM] Hints proposal  ("Merlin Moncure", )
    Re: [PERFORM] Hints proposal  (Andrew Sullivan, )
   Re: [PERFORM] Hints proposal  ("Zeugswetter Andreas ADI SD", )
    Re: [PERFORM] Hints proposal  (Andrew Sullivan, )
     Re: [PERFORM] Hints proposal  (Csaba Nagy, )
      Re: [PERFORM] Hints proposal  (Josh Berkus, )
     Re: [PERFORM] Hints proposal  ("Zeugswetter Andreas ADI SD", )
 Re: [PERFORM] Hints proposal  (Csaba Nagy, )
  Re: [PERFORM] Hints proposal  (Josh Berkus, )
   Re: [PERFORM] Hints proposal  (Csaba Nagy, )
  Re: [PERFORM] Hints proposal  (Tom Lane, )

> > Can you give us an example that had such a monstrous effect in
Oracle,
> > other than that the hint was a mistake in the first place ?
>
> Of course the hint was a mistake in the first place; the
> little story I told was exactly an example of such a case.
> The hint shouldn't have been put in place at the beginning;
> instead, the root cause should have been uncovered.

This is not an example. For us to understand, we need an actual case
with syntax and all, and what happened.

Imho the use of a stupid hint, that was added without analyzing
the cause and background of the problem is no proof that statement hints
are bad,
only that the person involved was not doing his job.

Andreas



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