Re: Questions on query planner, join types, and work_mem

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От Jayadevan M
Тема Re: Questions on query planner, join types, and work_mem
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Msg-id OF7B3491A5.E3985E12-ON6525776E.00184195-6525776E.00189A25@ibsplc.com
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Ответ на Questions on query planner, join types, and work_mem  (Peter Hussey <peter@labkey.com>)
Список pgsql-performance
Hello,
> the join column, lsid, is a poor choice for a join column as it is a
> long varchar value (avg length 101 characters) that us only gets
> unique way out on the right hand side.
Would a join on subtring on the 'way out on the right hand side' (did you
mean 'rightmost characters' or 'only when we take almost all the 101
characters'?) together with a function based index help?
Regards,
Jayadevan





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