Re: RE: convert big endian to medium endian
Date: Sat, 8 Feb 2020 15:12:14 +0000
Message-ID: <LNXP265MB15620470D34C83C4A9EF1967A51F0_at_LNXP265MB1562.GBRP265.PROD.OUTLOOK.COM>
I'm now a little puzzled.
In one post you've said you have about 4 million table/index partitions, adding 1,000 per day.
In another post you've said your database is about 10GB.
That's an average of 2.5KB per partition - which would certainly be a design error if true.
Have you considered doing a simple export / import to get the data from one database to the other. Using that approach you could first create empty objects in the target database with a more appropriate number of partitions.
Regards
Jonathan Lewis
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> on behalf of Ahmed Fikri <gherrami_at_gmail.com> Sent: 07 February 2020 22:32
To: Sweetser, Joe
Cc: ORACLE-L
Subject: Re: RE: convert big endian to medium endian
I agree with this wise advise. And I'm sure we will opt for the safe method. But my question is now only to have better understanding for how oracle works.
I suppose now that I have only 10 GB Database it is possible to migrate it to a different endian without using XTTS?
Best regards
Sweetser, Joe <JSweetser_at_icat.com<mailto:JSweetser_at_icat.com>> schrieb am Fr., 7. Feb. 2020, 23:21: 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<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
Sent: Friday, February 7, 2020 3:03 PM
To: ORACLE-L <oracle-l_at_freelists.org<mailto: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
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

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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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Received on Sat Feb 08 2020 - 16:12:14 CET