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Restore


Restore

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free_mascot
free_mascot
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Comments posted to this topic are about the item Restore

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Nice question, thanks.



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Raghavendra Mudugal
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Thank you for the post, free_mascot, interesting one. (couple of days ago, was searching the google for back/restore articles any newly written... and I came across one where this word "piecemeal" was mentioned, though I did not read it what it was about, but my first impression was some kind of made up name... and weird for me to find an entry in the local_help index... well ...w00t )

In the local help, at first it says

"This topic is relevant only for databases in the Enterprise edition of SQL Server that contain multiple files or filegroups; and, under the simple model, only for read-only filegroups."

and then...

"Piecemeal restore works with all recovery models, but is more flexible for the full and bulk-logged models than for the simple model. "

failed to co-relate them. One day I will see these in action, I suppose, as restoring FGs... in a decent and consistent way... should become a default practice.. :-)

ww; Raghu
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I was in doubt, because I found it difficult to get the intention of the question (perhaps because I'm not native English speaking). Did I need to take the question literally ("database needs to go offline when starting a restore") or do I need to take the question in general ("database needs to be offline during all the restore sequenses).
So I chose the wrong answer....

The linked article states:
•Online piecemeal restore scenario

In an online piecemeal restore, after the partial-restore sequence, the database is online, and the primary filegroup and any recovered secondary filegroups are available. Filegroups that have not yet been restored remain offline, but they can be restored as needed while the database remains online.


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Raghavendra Mudugal
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HanShi (6/6/2014)
I was in doubt, because I found it difficult to get the intention of the question (perhaps because I'm not native English speaking). Did I need to take the question literally ("database needs to go offline when starting a restore") or do I need to take the question in general ("database needs to be offline during all the restore sequenses).
So I chose the wrong answer....

The linked article states:
•Online piecemeal restore scenario

In an online piecemeal restore, after the partial-restore sequence, the database is online, and the primary filegroup and any recovered secondary filegroups are available. Filegroups that have not yet been restored remain offline, but they can be restored as needed while the database remains online.



(just trying to add in something..)

I guess because of this, as in it says "Online piecemeal restores can involve deferred transactions", so possibly involves higher risk because if more than one FG exists and only PRI FG is restored. In offline there is no risk as the db is offline and user or app cannot access and a DBA can make sure that before it goes online everything is prefect. So I think, by default they go Offline and in very rare circumstances (which I am not sure) they choose Online.

ww; Raghu
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Stewart "Arturius" Campbell
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Had to read up on this, so learned something new today,
thanks.

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I learned something new today as well. Thanks and everyone have a great weekend.


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m mcdonald
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HanShi (6/6/2014)
I was in doubt, because I found it difficult to get the intention of the question (perhaps because I'm not native English speaking). Did I need to take the question literally ("database needs to go offline when starting a restore") or do I need to take the question in general ("database needs to be offline during all the restore sequenses).
So I chose the wrong answer....

The linked article states:
•Online piecemeal restore scenario

In an online piecemeal restore, after the partial-restore sequence, the database is online, and the primary filegroup and any recovered secondary filegroups are available. Filegroups that have not yet been restored remain offline, but they can be restored as needed while the database remains online.



+1

Found the article before hand and answered the same way...
Dana Medley
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Ed Wagner (6/6/2014)
I learned something new today as well. Thanks and everyone have a great weekend.

+1



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RLilj33
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HanShi (6/6/2014)
I was in doubt, because I found it difficult to get the intention of the question (perhaps because I'm not native English speaking). Did I need to take the question literally ("database needs to go offline when starting a restore") or do I need to take the question in general ("database needs to be offline during all the restore sequenses).
So I chose the wrong answer....

I had the same question as you, HanShi, and I am a native English speaker. :-)

I had to do some reading and was able to find the topic in BOL. The 5th paragraph, 3rd sentence reads "During the piecemeal-restore sequence, the whole database must go offline."

See the topic, "Online piecemeal restore scenario". I believe the process is: Entire database goes offline, Primary filegroup is restored, Primary filegroup comes back online, Subsequent filegroups can be brought online one at a time.

I have not performed a piecemeal restore, so those more familiar - please make the necessary annotations!;-)
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