My understanding is that you can do plugin across platforms as long as they are
the same endian, but you need to use RMAN if you are changing endian. That
matches this document:
https://docs.oracle.com/en/cloud/cloud-at-customer/exadata-cloud-at-customer/exacc/mig-unplugging-plugging-pdb.html#GUID-A10B0819-0EC0-4B1D-B4BA-7A570CCF9A9F
So to me the hiccup regarding cloning unplugged plugins is only losing the
original recovery thread due to the unplug, plug back in bit on the original. I
wouldn’t expect plugin/unplug to convert endian and it makes sense to me that
requires RMAN and they only build that complication into the comprehensive
Recovery Management tool. I’m not sure what you are suggesting Oracle should
have that it does not have.
Does sql server do cross endian restores? I’ve never really used sql server
other than trivially, so that is an actual rather than rhetorical question. I
wasn’t aware that it ran on any big endian platforms, but I’ve never really
looked.
I don’t think Oracle will mind if I copy/paste their list:
SELECT PLATFORM_ID, PLATFORM_NAME, ENDIAN_FORMAT
FROM V$TRANSPORTABLE_PLATFORM
ORDER BY PLATFORM_ID;
PLATFORM_ID PLATFORM_NAME ENDIAN_FORMAT
----------- ---------------------------------------- --------------
1 Solaris[tm] OE (32-bit) Big
2 Solaris[tm] OE (64-bit) Big
3 HP-UX (64-bit) Big
4 HP-UX IA (64-bit) Big
5 HP Tru64 UNIX Little
6 AIX-Based Systems (64-bit) Big
7 Microsoft Windows IA (32-bit) Little
8 Microsoft Windows IA (64-bit) Little
9 IBM zSeries Based Linux Big
10 Linux IA (32-bit) Little
11 Linux IA (64-bit) Little
12 Microsoft Windows x86 64-bit Little
13 Linux x86 64-bit Little
15 HP Open VMS Little
16 Apple Mac OS Big
17 Solaris Operating System (x86) Little
18 IBM Power Based Linux Big
19 HP IA Open VMS Little
20 Solaris Operating System (x86-64) Little
21 Apple Mac OS (x86-64) Little
Has there been trouble plugging in the backup of an unplugged PDB cross
platform as long as the endians match? I missed that if so, but I have not
tested it.
mwf
From: Mladen Gogala [mailto:gogala.mladen@xxxxxxxxx] ;
Sent: Thursday, December 24, 2020 8:11 PM
To: Mark W. Farnham; oracle-l@xxxxxxxxxxxxx
Subject: Re: duplicate pdb from backup
Hi Mark,
Not just that. Backup is also a thing with SQL Server. I backed up my Windows
2012 AdventureWorks 2014 database and restored it to OL 7 SQL Server database
without any problems. In other words, the tenant backup should also include a
platform conversion.
On 12/24/20 5:52 PM, Mark W. Farnham wrote:
Something like “Create unplugged copy of <pdb name> [as <new pdb name>]”
making an unplugged copy of a pdb without unplugging it would be really useful,
especially if that means it does NOT reset the recovery thread in the original.
(This suggestion was made pretty much as soon as it was realized that the
recovery thread was reset). In that mode, the pluggable copy would not be
something you could roll forward, since it would be a new recovery thread
wherever you plugged it back in.
--
Mladen Gogala
Database Consultant
http://mgogala.byethost5.com
