RE: RE: convert big endian to medium endian

From: Sweetser, Joe <JSweetser_at_icat.com>
Date: Fri, 7 Feb 2020 22:21:19 +0000
Message-ID: <MN2PR11MB36157913CC42A450A4E93B9ED41C0_at_MN2PR11MB3615.namprd11.prod.outlook.com>

Being possible and being supported are 2 different things. With a database that size, I would tend to stay in a supported universe.

-joe

From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Ahmed Fikri Sent: Friday, February 7, 2020 3:03 PM
To: ORACLE-L <oracle-l_at_freelists.org> Subject: Re: RE: convert big endian to medium endian

sorry to ask again to this topic: why it is not possible to take all datafiles from the aix with big endian and convert them using external program (maybe a c program or even a dbms_file_transf r from other oracle instance) to the target endian and use them to create the new DB? This is like creating a new Database using a cold backup only with the additional step to convert the datafiles. I'm unfortunately not convinced that we should use the TTS methode. I think that using TTS is only good if we want to copy only a few TS of the DB. But in my case I want to copy the whole DB.

Thanks and regards.

Am Fr., 7. Feb. 2020 um 20:41 Uhr schrieb Ahmed Fikri <gherrami_at_gmail.com<mailto:gherrami_at_gmail.com>>: Only some additional information about the source DB: The db has about 4 million table/index partitions and every days will be created about 1 Thousand Partitions (I'm not sure whether this is good design). This could be maybe the reason why the metadata export is so slowly.

And to be honest the DBAs have already given some mos id for the datapump issue concerning the 11.2.0.4 version related to some x$k.. view. (I can't remember that now and I have now no access to my work email)

Ahmed Fikri <gherrami_at_gmail.com<mailto:gherrami_at_gmail.com>> schrieb am Fr., 7. Feb. 2020, 19:26: I write this email from an other email box(I'm in the train and the other app doesn't work now)

Thanks a lot Lewis not only for your technical explanation but also for reading between the lines and understanding my real problem. (Even my broken English)

Thanks and Regards
Ahmed

Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk<mailto:jonathan_at_jlcomp.demon.co.uk>> schrieb am Fr., 7. Feb. 2020, 19:15:

Your approach will not work because Oracle Corp. has not implemented an "in situ" mechanism for reading and updating a system tablespace and data dictionary that is in the wrong endian format. If they had produced such a mechanism they would have been shouting about it because it would make it much easier to migrate to Exadata from any alien platform.

If your dba is an expert then they might have mentioned which version of Oracle (11g is not a version, it's a marketing term), and which bug. There are many known bugs relating to slow metadata export and many of those bugs have patches. If your dba is a really expert expert they may even be able to work out WHY the export is slow (if there isn't a patch to fix their problem) and hack the data dictionary or supply SQL Patches to speed it up.

Regards
Jonathan Lewis

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From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> on behalf of ahmed.fikri_at_t-online.de<mailto:ahmed.fikri_at_t-online.de> <ahmed.fikri_at_t-online.de<mailto:ahmed.fikri_at_t-online.de>> Sent: 07 February 2020 17:16
To: Clay.Jackson_at_quest.com<mailto:Clay.Jackson_at_quest.com> Cc: oracle list
Subject: AW: RE: convert big endian to medium endian

thanks for this information. But when I hear the only one way to do something, I need to know why there is only one way. And why my approach will not work.

My problem is when using XTTS I should (from my understanding) export the metadata using datapump and the problem this takes 3 days and 4 hours. And from my understanding why should I export the metadata. Our DBA is an expert and he told me the export takes long time because of known bug in 11g. In the past I could copy databases using only cold backup, I could copy the data files in parallel using several processes. I'm not a DBA (I am from the application vendor installed on the db) but I read D. Kuhn book from the beginning to the end. So I need to understand how to to do this task: upgrading 11g on aix to 12g on linux in less than one weekend without using the buggy datapump.

this should be possible or not?The db is only 16tb big.

regards
Ahmed

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• Original-Nachricht --- Von: Clay Jackson (cjackson) Betreff: RE: convert big endian to medium endian Datum: 07.02.2020, 17:55 Uhr An: oracle list

AFAIK: The only way this would work would be with transportable tablespaces; either using the tablespaces, or RMAN (MOS 2013271.1).

There’s no “silver bullet” for this…

IMHO, your best choice is export/import with some sort of replication solution to help minimize downtime.

Clay Jackson

Database Solutions Sales Engineer

clay.jackson_at_quest.com<mailto:clay.jackson_at_quest.com>

office 949-754-1203 mobile 425-802-9603



From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> On Behalf Of ahmed.fikri_at_t-online.de<mailto:ahmed.fikri_at_t-online.de> Sent: Friday, February 7, 2020 6:02 AM
To: oracle list <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>> Subject: convert big endian to medium endian

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Hi all,

I want to test (I hope this weekend) following: 1 from 12c Db on AIX (big endian) I will create a cold backup 2 on Oracle linux (medium endian) I will create a new db using the cold backup from point 1 3 somehow I should convert the files from point 1 in medium endian

is this possible?

I don't want to use XTTTS and exporting the metadata using data pump.

Kind Regards
Ahmed

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http://www.freelists.org/webpage/oracle-l Received on Fri Feb 07 2020 - 23:21:19 CET