Reverse database mirroring - and is this the right approach?

Here is my scenario. I have 2 database servers, P and M, to serve our production website. P = Principal; M = Mirror.
After some time my Principal crashes. No problem, I've got M, it's been synchronizing, and it has all latest data. So I repoint my production web server to hit the Mirror. Still, all is good.
Now comes the part where I'm fuzzy, and I need to know if my understanding is correct...
The Principal comes back online, but my website is still pointing at the Mirror. I want to repoint the site back to Principal. But P now has old data. Maybe it's been down 3 days and M has 100,000 new records that don't exist in P. When P came back online,
did transaction logs begin shipping from M to P to get P back in sync? Would it do that if a Witness were in place? How does P get caught up with all latest data? Do I have to do a full backup and restore from M to P? Is there a way this can be set up to just
gracefully (or even easy manual) get P updated and synced? Can the Principal/Mirror roles be easily swapped between the 2 servers? Does that happen automatically with a Witness in place?
Thanks in advance for any help.

First, mirroring is being removed for "AlwaysOn" technology. I would not recommend using it in SQL 2012. However, if you are talking about prior versions, then...
When the failover occurs, the old mirror, now primary, attempts to send updates back to the old principal, now mirror. This is completely automatic and requires nothing manual to happen.
However, if the now mirror is down for a long period of time, the transaction log on the principal will continue to grow and grow until it is able to deliver the transactions to the mirror.
You can setup your website with a "Failover Partner=" in the connection string and the failover/failback will be completely invisible to your application.
I would suggest reading:
http://technet.microsoft.com/en-us/library/ms189852.aspx
http://technet.microsoft.com/en-us/library/cc917713.aspx

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so just wondering that is this the right way to code ...
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Threading looks fine too me... the connection is created on a background thread, but (critically) all GUI updates are performed on the EDT, even if there's an exception. Well done.
My only comment is... why is your GUI creating a database connection at all? Ideally the controler would get the DAO (which would connect itself) and inject it (the connected DAO) into the view... but I'm a server-side boy, so feel free to ignore me.
Cheers. Keith.

Difference between Database Mirroring and Cloning?

Hi,
Can anybody tell me the exact difference between Database Mirrorring and cloning?
Is database mirroring and multiplexing same?
Thanks
Rajesh

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HTH -- Mark D Powell --

[SOLVED] Thunar 1.6 doesn't drag-and-drop with the right mouse button

Hallo all.
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Last edited by GordonGR (2012-12-28 14:34:20)

Joel wrote:
anonymous_user wrote:Is it supposed to be with the right-mouse button? I always thought drag and drop was done with the left button?
Could be right-hand user
Come on! Read what GordonGR wrote!
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A small but very irritating bug in Mail: after pressing the spacebar after typing an apostrophe in a word such as "we're", the cursor moves to the left i.e. backwards, and not to the right, effectively deleting a space and not creating one.

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Is this the right way - 9i

I have schema 'A' with few large and many small non-partition tables. I created another schema 'B' identical to 'A' and the only difference was that I partitioned the large tables resulting a combination of partitioned and non partitioned tables in schema 'B'.
I exported schema 'A' and imported it into 'B'. My question is, IS this the right way or I should done something else.
Thx

It would depend on the your goals, but I'd suspect that you would want to create most of the same indexes and views in the new schema. If you're partitioning the tables, though, you would have to give serious thought to how to define the indexes-- should they be global or local, should they be equipartitioned with the underlying tables, etc.-- which exporting and importing wouldn't resolve.
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Reverse database mirroring - and is this the right approach?

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