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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Re[2]: Datafile Migration Tool
"Imports/exports only use about 1/10 of your available sustained io generally. Although direct exports are noticably faster and less stress on the database."
And why do we need to read this?
"Locking, rollback generation, constraints, triggers can affect the performance of the import/export process as well. Also network io if it isn't a local export/import."
Again - why do we need to read this? Any person even little knowlegeble in Oracle DBA knows this
"Direct path exports do not effect the speed of imports. Unless your using SQLLDR direct. Direct path exports only effect the speed in which the export is created and the resources it uses."
SQLLDR cannot use sxport dump file as a source
"Conventional exports are cpu bound, where direct path exports are io bound."
Who told you so?
Alex Hillman
-----Original Message-----
Sent: Thursday, August 16, 2001 11:28 AM
To: Multiple recipients of list ORACLE-L
Imports/exports only use about 1/10 of your available sustained io generally. Although direct exports are noticably faster and less stress on the database.
Locking, rollback generation, constraints, triggers can affect the performance of the import/export process as well. Also network io if it isn't a local export/import.
Direct path exports do not effect the speed of imports. Unless your using SQLLDR direct. Direct path exports only effect the speed in which the export is created and the resources it uses.
Conventional exports are cpu bound, where direct path exports are io bound.
"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: Thursday, August 16, 2001 9:18 AM
To: Multiple recipients of list ORACLE-L
Alex,
It's tough to guess how long an import will take. It all depends on how many indexes and constraints you have - these are what take the most time at import time. The data gets sucked in real fast. Using Direct Load really speeds the import up but, again, rebuilding the indexes takes forever.
Gene is correct in that export is extremely fast.
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Wednesday, August 15, 2001 7:01 PM
To: Multiple recipients of list ORACLE-L
Alex - you must be joking, 60hrs? i get ~1gb/3mins for export. i haven't done an import lately, but its not that bad. exp/imp are great tools to move data around.
gene
>>> Alex.Hillman_at_usmint.treas.gov 08/15/01 06:08PM >>>
exp/imp does not work(takes too much time)for large databases. How long do
you think import will take for 200G database? - about 60 hours?
Alex Hillman
-----Original Message-----
Sent: Tuesday, August 14, 2001 5:03 PM
To: Multiple recipients of list ORACLE-L
Rachel,
I can see what he is proposing, but I'm not sure anyone would care. I know I can't take the datafiles from one of our HP-UX servers and use them to create a database on NT for instance. Wish I could for our Support Magic junk. In that case they do a bunch of things (like create objects) as SYS which never get included in an export. The problem that I see is that there is a toolset that currently exists, namely export & import, that work cross platform with no problems. Just not at the datafile level. And although that type of tool would be interesting to me it would not be of much value since I've only the one problem.
Dick Goulet
____________________Reply Separator____________________ Author: "Rachel Carmichael" <carmichr_at_hotmail.com> Date: 8/14/2001 12:41 PM
it doesn't sound like an ftp type tool. If I am reading this correctly, he is proposing to provide a tool that copies datafiles directly from one OS to
another.
While this is an interesting trick, I'm not sure there's a large market for it.
>From: Scott Shafer <sknd100_at_yahoo.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Re: Datafile Migration Tool
>Date: Tue, 14 Aug 2001 12:00:53 -0800
>
>Not to be a smartass, but don't most OS's already have ftp built in?
>What kind of value-added are you proposing? Just curious...
>
>Scott Shafer
>San Antonio, TX
>
>
>K Gopalakrishnan wrote:
> >
> > Hi ,
> >
> > Will there be a market if I give a tool which migrates Oracle
> > database from One OS to another OS. (Data file migration at
> > Operating System
> > Level.)
> >
> > i.e it will convert from Oracle data files on NT to Oracle
> > Datafiles on Solaris and vice versa. In the target database you
> > need to recreate the control files and you are done. You can startup
> > the database. You don't need to export/import or CTAS over dblink..
> >
> > Send your replies directly to me..
> >
> > Thanks Yong..for bringing the cat out of the basket ;)
> >
> > =====
> > Have a nice day !!
> > ------------------------------------------------------------
> > Best Regards,
> > K Gopalakrishnan,
> > Bangalore, INDIA.
>
>_________________________________________________________
>Do You Yahoo!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Scott Shafer
> INET: sknd100_at_yahoo.com
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: carmichr_at_hotmail.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: INET: dgoulet_at_vicr.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: Hillman, Alex INET: Alex.Hillman_at_usmint.treas.gov 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: Gene Sais INET: Gsais_at_co.palm-beach.fl.us 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: Mercadante, Thomas F INET: NDATFM_at_labor.state.ny.us 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: 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 -------------------------------------------------------------------- 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: Hillman, Alex INET: Alex.Hillman_at_usmint.treas.gov 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).Received on Thu Aug 16 2001 - 10:02:20 CDT
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