Re: How does TOAST compare to other databases' mechanisms?

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От
Bruce Momjian
Тема
Re: How does TOAST compare to other databases' mechanisms?
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200010091812.OAA21855@candle.pha.pa.us
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Re: How does TOAST compare to other databases' mechanisms? Frank Joerdens <frank@joerdens.de>
Re: How does TOAST compare to other databases' mechanisms? Tom Lane <tgl@sss.pgh.pa.us>
Re: How does TOAST compare to other databases' mechanisms? Philip Warner <pjw@rhyme.com.au>
Re: How does TOAST compare to other databases' mechanisms? Tom Lane <tgl@sss.pgh.pa.us>
Re: How does TOAST compare to other databases' mechanisms? Bruce Momjian <pgman@candle.pha.pa.us>
Re: How does TOAST compare to other databases' mechanisms? Philip Warner <pjw@rhyme.com.au>
Re: How does TOAST compare to other databases' mechanisms? Tom Lane <tgl@sss.pgh.pa.us>
Re: How does TOAST compare to other databases' mechanisms? Philip Warner <pjw@rhyme.com.au>
Re: How does TOAST compare to other databases' mechanisms? Jan Wieck <janwieck@yahoo.com>
Re: How does TOAST compare to other databases' mechanisms? Tom Lane <tgl@sss.pgh.pa.us>
> Philip Warner  writes:
> > In the case of images, is there a way to tell TOAST not to bother even
> > trying to compress the data? (eg. JPEG files). If so, would I be right in
> > assuming that this would be better for fast retrieval (even for text
> > files)?
> 
> TOAST will not store a compressed value unless the compressed value is
> smaller than the uncompressed by some reasonable amount (which looks to
> be 20% by default).  I'd expect JPEG-like data always to fail the

Yea, I know, I have never heard of JPEG either, but Tom Lane is Mr.
Internet JPEG, so humor him.  :-)

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
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