Upgrade using Db mirroring

Hi Everyone,
I came to know that using SQL Server database mirroring, we can perform the upgrades with minimal downtime.
How that is possible? Can anyone elaborate ?
I have done some homework reading about this and wanted to confirm on this.
Assume I have old server is SQL Server 2005 Enterprise Edition and new server is SQL Server 2008 Enterprise Edition.
Now, I am going to Setup High Safety mode without witness. I dont want witness because, we have risk Automatic failover and I don't want that happen in middle of upgrade.
Also make sure logins , orphan users are fixed, jobs ,linked servers are created on the new server.
once everything is sync , initiate a manual failover.
use master
go
alter database <dbname> set partner failover;
go
Is this the way we can perform upgrades with minimal downtime ?
Again, once the upgrade is done and verified from error log, do we remove db mirroring and point the applications to the new server?
Please correct me if I am wrong and am I missing anything here?
Thanks in Advance.

Yes, I think you get the idea. Something like (brief outline):
App connected to A
BACKUP DATABASE on A
RESTORE DATABASE on B WITH NORECOVERY
BACKUP LOG on A
RESTORE LOG on B WITH NORECOVERY
1. Stop/Disconnect app from A
BACKUP LOG on A WITH NORECOVERY --The option make sure no more modifications on A
RESTORE LOG on B WITH RECOVERY
2. Start/connect app to B
As you probably realize, with some practice and preparation, we can achieve a very short time-span between timepoint 1. and 2. above.
Regarding Naveen's suggestion about log shipping: Yes, it is possible to use log shipping for this. Personally, I see little value in configuring and implementing log shipping solely for the purpose of an upgrade. But of course it depends on the circumstances,
and usual. :-)
Tibor Karaszi, SQL Server MVP |
web | blog

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jasonwryan wrote:
Please edit your title to reflect the fact that Octopi borked your system.
https://wiki.archlinux.org/index.php/Pa … an_upgrade
Thank you for the link, not to mention the quick reply.
The packages python-packagekit and packagekit had to be removed before I could start the installation as they had a dependency on a older version of pacman. My mirrors file caused a good deal of packages to not be downloaded, so that had to be changed. Afterwards everything went well. This experience has shown me the strength of the Arch package system, it's really an amazing system.
I tried the recommended command from the above link but kept getting numerous error messages stating that such and such file already existed on the filesystem. Which was true enough, so I added the --force parameter and that did the trick.
This is the command I used to get running again:
pacman -S $(pacman -Qnq) --force
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I'd like to buy an Apple TV in order to use AirPlay Mirroring. I understand that only the MacBook Pro laptops that have been released in 2011 or later are compatible with the feature, but I know that some third party apps (like AirParrot) offer a decent workaround. Unfortunately, it seems that the MacBook Pro 5,5 (i.e. my laptop!) isn't compatible with AirParrot.
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MC026xx/A
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DO SOMETHING!

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