Actually, I suspect I will be able to do the testing myself before I get more back
from those guys.
Matthew Zito made a good point in another reply to this message saying that 32 bit
addresses had to be translated to 64 bit addresses because of architecture
requirements so you would still have a one cycle instruction fetch (neglecting cache
misses and wait states for access from slow main memory).
Building on that, perhaps address translation might be the problem. 32 bit addresses
map you into 4GB of memeory. Those 4GB segments would be mapped into the 64 bit CPU's
larger address space. I don't know PA RISC assembler or register sets but something
like a TLB would be needed. It would be odd if that accounted for a 20 - 25% overhead.
Similarly there would probably be some io space remapping as well. Quien Sabe? I
will be able to run side by side instances on the test box to check it out. Maybe
some of the listers would be interested in the results.
Allan
-----Original Message-----
Sent: Tuesday, August 12, 2003 4:09 PM
To: Multiple recipients of list ORACLE-L
Frankly, that does not sound logical to me, but I would be extremely interested if
there is any authenticity to the statement.
I would ask the individual who made the statement to provide the proof. I
can't stop envisioning this on the next myth list.
PST
Please respond to [EMAIL PROTECTED]
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First thanks to every one who responded both on the list and to my private
email:
The consensus appeared to be:
1. SharePlex is overly expensive for the functionality delivered and 2. Oracle has
caught up in 9i for much of the functionality 3. Some features of Oracle like IOT's
may present some problems.
We are on HPUX and 9i is 64 bit only on that platform. I have been told that the
64bit code imposes a 20 - 25% performance penalty vs the 32 bit version of 8.1.7. Can
anyone address this from experience?
Allan L. Nelson
Oracle DBA
M-I L.L.C.
(832) 295-2238 office
(832) 351-4180 fax
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