Re: [HACKERS] Execution time.

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От Shiby Thomas
Тема Re: [HACKERS] Execution time.
Дата
Msg-id 199802041626.LAA01859@cise.ufl.edu
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Ответ на Re: [HACKERS] Execution time.  ("Vadim B. Mikheev" <vadim@sable.krasnoyarsk.su>)
Ответы Re: [HACKERS] Execution time.
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=> > I invoked postmaster as:
=> >  postmaster -B 30000 -o "-s -F -S 16384"
=>                  ^^^^^
=> 240M of shared memory ?!
=>
Is the size of the hash bucket dependent on the number of buffers available ?
If so, with -B 30000, it might create huge hash buckets and hence the
hash join could degenerate to a nested loops join. Is that possible -- just
checking. What could be good values for -B and -S. The largest table I am
joining is about 60M

Thanks
--shiby




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