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Re: BLOBs

From: Aarni Ruuhimäki / Megative Tmi / KYMI(dot)com <aarni(dot)ruuhimaki(at)kymi(dot)com>
To: "Chad Thompson" <chad(at)weblinkservices(dot)com>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: BLOBs
Date: 2002-08-16 18:53:37
Message-ID: 20020816185600.QMXB29112.fep08.tmt.tele.fi@there (view raw or flat)
Thread:
Lists: pgsql-novice
Hi !

With some experience and a general eye on various forums I decided some time 
ago not to use blobs, but a path to a file in your DB field.

BR,

aarni


On Friday 16 August 2002 07:52 pm, you wrote:
> That is exactly what i have been doing to date.  I have always thought that
> it would be cool to manage these files (.wav in my case) in a database, w/o
> the problem of some user mucking with a directory and screwing up the
> files.
>
> I believe that i'll give it try.
>
> Thanks for all your responses
> Chad
> ----- Original Message -----
> From: "Aurangzeb M. Agha" <aagha(at)bigfoot(dot)com>
> To: "Warwick Hunter" <whunter(at)agile(dot)tv>
> Cc: "Chad Thompson" <chad(at)weblinkservices(dot)com>; "pgsql-novice"
> <pgsql-novice(at)postgresql(dot)org>
> Sent: Thursday, August 15, 2002 10:26 PM
> Subject: Re: [NOVICE] BLOBs
>
> > I hope this isn't getting too academic, but why not store the path to
> > blobs in the DB and access them in some other fashion?
> >
> > Rgs,
> > Aurangzeb
> >
> > On Fri, 16 Aug 2002, Warwick Hunter wrote:
> > :Chad
> > :
> > :I am using PostgreSQL to store BLOBS. I can't say that the
> > :performance I am getting is wonderful, but it is adequate
> > :for my purposes for now. Few people are every satisfied
> > :with the performance of their database anyway :-)
> > :
> > :I have done some performance testing on PostgreSQL and have
> > :discovered that on an Linux Intel machine with reasonably fast
> > :SCSI discs I can get average performance numbers like these:
> > :
> > :Binary BLOB Size
> > :300 KB read=24  ms write=185 ms del=105 ms
> > :150 KB read=11  ms write=90  ms del=51  ms
> > :   5 KB read=2.5 ms write=14  ms del=11  ms
> > :
> > :I have done a small amount of tuning of the PostgreSQL
> > :configuration. I plan to do some more.
> > :
> > :> Or is storing BLOBs in a DB a good idea?
> > :
> > :I have found PostgreSQL to be quite robust. I have a
> > :test that deliberately kills the postmaster and postgres
> > :subprocesses while doing write operations to see if I
> > :can cause the database to be corrupted. This test
> > :rarely fails.
> > :
> > :This test fails more regularly if you rewrite the
> > :data of an existing BLOB rather than create a new
> > :one and delete the old one. So now I only ever create
> > :a new BLOB.
> > :
> > :I have seen one instance when the power on a machine
> > :failed while writing a BLOB caused one BLOB to not
> > :be restored correctly when the database came up.
> > :I plan to investigate this and report a bug if
> > :appropriate.
> > :
> > :I looked at the bytea data type for storing my objects
> > :as regular columns. However I was unable to make it work
> > :with the normal SQL statements, the binary data always
> > :upset the SQL command and the escaping routines didn't
> > :seem to help.
> > :
> > :Warwick
> >
> > --
> > Aurangzeb M. Agha    | Email : aagha(at)bigfoot(dot)com
> >
> >                      | Home  : +3 010 8959.558
> >
> > 34 Nafsika St.       | Direct: +3 010 8995.875
> > Voula 16673          | Mobile: TBD
> > Greece               | Voice : 415 412 4234 (US Only)
> >
> >                      | e-Fax : 978 246.0770
> >
> > PGP ID: 0x68B3A763   |
> >
> > "Those who would give up essential liberty to purchase a little
> >  temporary safety deserve neither liberty nor safety."
> >
> > - Benjamin Franklin
>
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  • Re: BLOBs at 2002-08-16 16:52:53 from Chad Thompson

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