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FAQ
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Is there any benefit of 64 bit versions over 32 bit versions of Oracle
beyond allowing > 2GB SGAs? (8.1.7/Solaris 2.8 in particular) The
systems I'm working with are predominantly DSS queries against data sets
that most of the servers have no hope of caching anywhere near the amount
of data needed so huge SGAs are not that useful. Our C++ guys tell me
that Sun reccommends that compiling 64 bit binaries for processes that
might take advantage of the larger memory limit. The logic being that 64
bit pointers take up twice as much space as 32 bit pointers and the
processor cache density is thus lower for 64 bit processes.

Does anyone know if there is any additional trickery Oracle does on the
64-bit port that may provide performance benefits that would outweigh the
potential for lower cache hit rates? Magic data structures?
_make_sql_faster support?

S-

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  • Christopher Spence at Sep 14, 2001 at 7:06 pm ⇧
    !! Please do not post Off Topic to this List !!

    Depends, 64bit can certainly give you more throughput, but it is very slow
    for being patched.

    "Do not criticize someone until you walked a mile in their shoes, that way
    when you criticize them, you are a mile a way and have their shoes."

    Christopher R. Spence
    Oracle DBA
    Phone: (978) 322-5744
    Fax: (707) 885-2275

    Fuelspot
    73 Princeton Street
    North, Chelmsford 01863


    -----Original Message-----
    Sent: Friday, September 14, 2001 3:50 PM
    To: Multiple recipients of list ORACLE-L

    !! Please do not post Off Topic to this List !!

    Is there any benefit of 64 bit versions over 32 bit versions of Oracle
    beyond allowing > 2GB SGAs? (8.1.7/Solaris 2.8 in particular) The
    systems I'm working with are predominantly DSS queries against data sets
    that most of the servers have no hope of caching anywhere near the amount
    of data needed so huge SGAs are not that useful. Our C++ guys tell me
    that Sun reccommends that compiling 64 bit binaries for processes that
    might take advantage of the larger memory limit. The logic being that 64
    bit pointers take up twice as much space as 32 bit pointers and the
    processor cache density is thus lower for 64 bit processes.

    Does anyone know if there is any additional trickery Oracle does on the
    64-bit port that may provide performance benefits that would outweigh the
    potential for lower cache hit rates? Magic data structures?
    _make_sql_faster support?

    S-

    --
    Please see the official ORACLE-L FAQ: http://www.orafaq.com
    --
    Author: Steve Rospo
    INET: srospo_at_watchmark.com

    Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
    San Diego, California -- Public Internet access / Mailing Lists
    --------------------------------------------------------------------

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    to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
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    (or the name of mailing list you want to be removed from). You may
    also send the HELP command for other information (like subscribing).
    --
    Please see the official ORACLE-L FAQ: http://www.orafaq.com
    --
    Author: Christopher Spence
    INET: cspence_at_FuelSpot.com

    Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
    San Diego, California -- Public Internet access / Mailing Lists
    --------------------------------------------------------------------

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  • Jonathan Lewis at Sep 14, 2001 at 8:08 pm ⇧
    !! Please do not post Off Topic to this List !!

    My experience to date is that Oracle 9i running
    on 64-bit hp-ux 11 runs at about half the speed
    of Oracle 8.1.7 running on 32-bit hp-ux.

    I also have a test on Sun showing 9.0.1 on
    64-bit Solaris running 20% slower than
    8.1.7 on 64-bit Solaris; and at speed which
    suggest that it is the 32/64 bit change that
    causes most of the degradation.

    I have yet to install 8.1.7 on 64-bit hp-ux
    and compare it with the other two hp-ux
    setups.

    Jonathan Lewis
    http://www.jlcomp.demon.co.uk

    Host to The Co-Operative Oracle Users' FAQ
    http://www.jlcomp.demon.co.uk/faq/ind_faq.html

    Author of:
    Practical Oracle 8i: Building Efficient Databases

    Screen saver or Life saver: http://www.ud.com
    Use spare CPU to assist in cancer research.

    -----Original Message-----
    To: Multiple recipients of list ORACLE-L
    Date: 14 September 2001 20:12
    !! Please do not post Off Topic to this List !!


    Is there any benefit of 64 bit versions over 32 bit versions of Oracle
    beyond allowing > 2GB SGAs? (8.1.7/Solaris 2.8 in particular) The
    systems I'm working with are predominantly DSS queries against data sets
    that most of the servers have no hope of caching anywhere near the amount
    of data needed so huge SGAs are not that useful. Our C++ guys tell me
    that Sun reccommends that compiling 64 bit binaries for processes that
    might take advantage of the larger memory limit. The logic being that 64
    bit pointers take up twice as much space as 32 bit pointers and the
    processor cache density is thus lower for 64 bit processes.

    Does anyone know if there is any additional trickery Oracle does on the
    64-bit port that may provide performance benefits that would outweigh the
    potential for lower cache hit rates? Magic data structures?
    _make_sql_faster support?

    S-




    --
    Please see the official ORACLE-L FAQ: http://www.orafaq.com
    --
    Author: Steve Rospo
    INET: srospo_at_watchmark.com

    Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
    San Diego, California -- Public Internet access / Mailing Lists
    --------------------------------------------------------------------
    To REMOVE yourself from this mailing list, send an E-Mail message
    to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
    the message BODY, include a line containing: UNSUB ORACLE-L
    (or the name of mailing list you want to be removed from). You may
    also send the HELP command for other information (like subscribing).
    --
    Please see the official ORACLE-L FAQ: http://www.orafaq.com
    --
    Author: Jonathan Lewis
    INET: jonathan_at_jlcomp.demon.co.uk

    Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
    San Diego, California -- Public Internet access / Mailing Lists
    --------------------------------------------------------------------
    To REMOVE yourself from this mailing list, send an E-Mail message
    to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
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    also send the HELP command for other information (like subscribing).
  • Steve Rospo at Sep 14, 2001 at 8:23 pm ⇧
    !! Please do not post Off Topic to this List !!

    Where does this additional throughput come from?

    S-
    On Fri, 14 Sep 2001, Christopher Spence wrote:

    !! Please do not post Off Topic to this List !!

    Depends, 64bit can certainly give you more throughput, but it is very slow
    for being patched.

    "Do not criticize someone until you walked a mile in their shoes, that way
    when you criticize them, you are a mile a way and have their shoes."

    Christopher R. Spence
    Oracle DBA
    Phone: (978) 322-5744
    Fax: (707) 885-2275

    Fuelspot
    73 Princeton Street
    North, Chelmsford 01863
    -----Original Message-----
    Sent: Friday, September 14, 2001 3:50 PM
    To: Multiple recipients of list ORACLE-L

    !! Please do not post Off Topic to this List !!

    Is there any benefit of 64 bit versions over 32 bit versions of Oracle
    beyond allowing > 2GB SGAs? (8.1.7/Solaris 2.8 in particular) The
    systems I'm working with are predominantly DSS queries against data sets
    that most of the servers have no hope of caching anywhere near the amount
    of data needed so huge SGAs are not that useful. Our C++ guys tell me
    that Sun reccommends that compiling 64 bit binaries for processes that
    might take advantage of the larger memory limit. The logic being that 64
    bit pointers take up twice as much space as 32 bit pointers and the
    processor cache density is thus lower for 64 bit processes.

    Does anyone know if there is any additional trickery Oracle does on the
    64-bit port that may provide performance benefits that would outweigh the
    potential for lower cache hit rates? Magic data structures?
    _make_sql_faster support?

    S-
    --
    Please see the official ORACLE-L FAQ: http://www.orafaq.com
    --
    Author: Steve Rospo
    INET: srospo_at_watchmark.com

    Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
    San Diego, California -- Public Internet access / Mailing Lists
    --------------------------------------------------------------------
    To REMOVE yourself from this mailing list, send an E-Mail message
    to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
    the message BODY, include a line containing: UNSUB ORACLE-L
    (or the name of mailing list you want to be removed from). You may
    also send the HELP command for other information (like subscribing).

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postedSep 14, '01 at 6:50p
activeSep 14, '01 at 8:23p
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