Re: AW: LIMIT in DECLARE CURSOR: request for comments

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От Philip Warner
Тема Re: AW: LIMIT in DECLARE CURSOR: request for comments
Дата
Msg-id 3.0.5.32.20001101002353.02ab1b00@mail.rhyme.com.au
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Ответ на AW: LIMIT in DECLARE CURSOR: request for comments  (Zeugswetter Andreas SB <ZeugswetterA@wien.spardat.at>)
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At 14:14 31/10/00 +0100, Zeugswetter Andreas SB wrote:
>> 
>> Which is why I like the client being able to ask the 
>> optimizer for certain kinds of solutions *explicitly*.
>
>Yes, something like:
>    set optimization to [first_rows|all_rows]
>

That's one way that is usefull for affecting all subsequent statements, but
it would be nice to also allow such things in each statement, eg. in comments:
   /*++optimizer: fast_start, no_seq_scan */   select...

ie. make all settable values dynamically settable in a statement. The scope
of the settings would probably have to depend on the abilities of the
optimizer - eg. how would subselects and views be handled?


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