For the previous poster, my understanding of
_disable_logging is that all of the normal operations
take place EXCEPT the actual physical write. Hence
you will get log switches, check points etc etc. If
you were *really* needing to use it (say for a large
load on a non-production system) then you would want
massive log files to minimise the switch frequency
hth
connor
- Tim Gorman <Tim_at_SageLogix.com> wrote: > I
hesitated mentioning that parameter in this forum,
> but I figured what the
> heck? Could be fun, in a sick way... :-)
>
> Once I was teaching a DBA class and mentioned
> "_DISABLE_LOGGING".
> Immediately, I saw every head in the class look
> down, scribbling furiously!
> I had to backtrack very quickly and warn of the
> consequences of disabling
> redo logging (i.e. database corruption if not
> shutdown normally for any
> reason)...
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> Sent: Monday, June 24, 2002 2:48 PM
>
>
> > Hi Tim
> >
> > Yes, I have tried the _disable_logging, does not
> work on all platforms. DB
> > starts up fine, but redo log is generated,
> evidenced by log switching
> going
> > on.
> >
> > Also if I do a normal DML (large-ish one to
> verify), then dump the redo
> log,
> > I see my transaction there, so for a 420R, running
> Solaris8 and Oracle
> > 9.0.1, it would seem that _disable_logging does
> not work.
> >
> > I don't want to complicate the picture even
> further with transportable
> > tablespaces, which would mean that I would need to
> store all dependent
> > objects (in this case indexes only) in the same
> tablespace, which I could
> > easily achieve by rebuilding all indexes using a
> dynamic SQL.
> >
> > Informatica BTW does not only do single level
> inserts, version 5.0 onwards
> > has a 'bulk load' feature, but I am not sure what
> this actually does.
> > Previously Sagent also had a 'direct load' switch,
> which meant that it
> wrote
> > all of its data to large (very large) flat files
> and then used Sql*Loader
> > direct path to load. Fast, but Sagent at the time
> was very unreliable,
> > because on identical runs, it would sometimes load
> all the data, sometimes
> > only a portion, and every time, would report no
> errors and everything
> hunky
> > dory, until you went looking for your data. I
> remember that took me about
> a
> > week of arguing to prove that Sagent was at fault.
> >
> > Thanks for the suggestion of the Non volatile RAM
> (NVRAM) unit, it makes
> the
> > most sense. I will suggest this to my damagers.
> >
> > Regards:
> > Ferenc Mantfeld
> > Senior Performance Engineer
> > Siebel Performance Engineering
> > Melbourne, 3000, VIC, Australia
> > Only Robinson Crusoe had all his work done by
> Friday
> >
> >
> > -----Original Message-----
> > Sent: Sunday, 23 June 2002 9:03 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Have you considered setting "_DISABLE_LOGGING =
> TRUE"
> > instead? It could be just as disastrous... ;-)
> >
> > Buying an NVRAM unit would probably be more
> sensible, since
> > at least then you have some probability of the
> file-system
> > on such a unit surviving node failure or restart.
> >
> > I don't use Informatica, but I believe it mainly
> does
> > single-row inserts, so not using the APPEND hint
> is a
> > blessing anyway. After all, who likes one row in
> each
> > database block? However, I could be wrong about
> that and it
> > may actually be performing multi-row/array
> insertions...
> >
> > I don't know what your loads are like, but how
> about
> > something like this instead?
> >
> > - create a small database with _DISABLE_LOGGING
> set to
> > TRUE
> > - use Informatica to load into a tablespace on
> that small,
> > sacrificial db
> > - use "transportable tablespace" to copy the
> tablespace to
> > your real DW
> >
> > Just an idea (better you than me to try it!)...
> >
> > ----- Original Message -----
> > To: "Multiple recipients of list ORACLE-L"
> > <ORACLE-L_at_fatcity.com>
> > Sent: Sunday, June 23, 2002 8:53 PM
> >
> >
> > > Hi All
> > >
> > > does anyone have any white paper or info on how
> to
> > configure a dedicated
> > > portion of real memory as a virtual drive on
> Solaris ? I
> > want to move my
> > > online redo logs (4 X 128 M single threaded) for
> a 300 GB
> > DW onto it, to
> > > speed up Informatica ETL, since Informatica does
> not allow
> > me to specify /*+
> > > APPEND */ mode of insert. I know I will not
> bypass the SQL
> > layer this way,
> > > but at least, the LGWR will be writing to memory
> instead
> > of disk. Thanks in
> > > advance.
> > >
> > > Regards:
> > > Ferenc Mantfeld
> > > Senior Performance Engineer
> > > Siebel Performance Engineering
> > > Melbourne, 3000, VIC, Australia
> > > Only Robinson Crusoe had all his work done by
> Friday
> > >
> > >
> > > -----Original Message-----
> > > Sent: Saturday, 22 June 2002 9:03 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > >
> > > On Solaris
> > >
> > > ps -ef -opid,ppid,vsz=VIRTMEM -orss=PHYSMEM
> > -opmem,pcpu,user,args
> > >
> > > use:
> > >
> > > psrinfo -v
> > > prtconf | grep Mem
> > > format
> > > uname -a
> > >
> > > HTH
> > >
> > > Richard
> > >
> > > -----Original Message-----
> > > Sent: Saturday, June 22, 2002 1:38 PM
> > > To: Multiple recipients of list ORACLE-L
> > >
> > >
> > > Good day to everyone...
> > >
> > > I have two questions related to Linux and
> Solaris...
> > >
> > > * I need do find memory usage (physical,
> virtual...) of a
> > particular
> > > proccess. PID is given by by "ps", but what
> aditional
> > parameters I have to
> > > provide? At a first glance, output of "man ps"
> vas
> > confusing...
> > >
> > > * How do I find computer's configuration - what
> CPU,
> > numbers of CPUs, clock,
> > > amount of memory, number of harddrives, what
> version of
> > OS, what OS patches
> > > are applied...?
> > >
> > > No, I can't ask sysadmin about that (hard to
> explain),
> > and, no, I don't have
> > > any kind of advanced manuals...
> > >
> > > Thanks in advance,
> > > Vladimir
> > >
> > > --
> > > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.com
> > > --
> > > Author: Vladimir Barac - posao
> > > INET: vladob_at_aster.si
> > >
> > > 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
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> > > (or the name of mailing list you want to be
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> > You may
> > > also send the HELP command for other information
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> > > --
> > > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.com
> > > --
> > > Author: Ji, Richard
> > > INET: Richard.Ji_at_MobileSpring.com
> > >
> > > Fat City Network Services -- (858) 538-5051
> FAX: (858)
> > 538-5051
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> > --------
> > > To REMOVE yourself from this mailing list, send
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> > >
> > >
> > > --
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> > > --
> > > Author: Ferenc Mantfeld
> > > INET: fmantfeld_at_siebel.com
> > >
> > > Fat City Network Services -- (858) 538-5051
> FAX: (858)
> > 538-5051
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> > --
> > Please see the official ORACLE-L FAQ:
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> > --
> > Author:
> > INET: tim_at_sagelogix.com
> >
> > Fat City Network Services -- (858) 538-5051
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> >
>
> > To REMOVE yourself from this mailing list, send an
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> > --
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> > --
> > Author: Ferenc Mantfeld
> > INET: fmantfeld_at_siebel.com
> >
> > Fat City Network Services -- (858) 538-5051
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> > San Diego, California -- Public Internet
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> >
>
> > To REMOVE yourself from this mailing list, send an
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> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Tim Gorman
> INET: Tim_at_SageLogix.com
>
> Fat City Network Services -- (858) 538-5051 FAX:
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Connor McDonald
http://www.oracledba.co.uk
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
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Received on Tue Jun 25 2002 - 10:13:31 CDT
