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SQLRNNR
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Thomas Abraham (6/21/2012)
tommyh (6/21/2012)
Works just fine to attach a database with just "for attach" with only one log file.

/T


I figured it would. But it's nice to have it confirmed. (Yes, I don't always trust BOL.) Thanks for the effort!


I have used the For Attach method several times as well.



Jason AKA CirqueDeSQLeil
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Answered off the cuff believing that FOR ATTACH rebuilds the log.

Thanks tommyh for confirming... Missed the earlier post

Cheers
sestell1
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SQLRNNR (6/21/2012)
Thomas Abraham (6/21/2012)
tommyh (6/21/2012)
Works just fine to attach a database with just "for attach" with only one log file.

/T


I figured it would. But it's nice to have it confirmed. (Yes, I don't always trust BOL.) Thanks for the effort!


I have used the For Attach method several times as well.


I've done this as well without the log file for various reasons.
GilaMonster
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Worth noting that the attach will only succeed if the database was cleanly shut down before the log was deleted. Otherwise the attach (even with Attach_rebuild_log) will fail.

Gail Shaw
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gchornenkyy
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BOL citation:

FOR ATTACH [ WITH < attach_database_option > ]

Specifies that the database is created by attaching an existing set of operating system files. There must be a <filespec> entry that specifies the primary file. The only other <filespec> entries required are those for any files that have a different path from when the database was first created or last attached. A <filespec> entry must be specified for these files.

FOR ATTACH requires the following:

All data files (MDF and NDF) must be available.

If multiple log files exist, they must all be available.

[highlight=#ffff11] If a read/write database has a single log file that is currently unavailable, and if the database was shut down with no users or open transactions before the attach operation, FOR ATTACH automatically rebuilds the log file and updates the primary file. [/highlight]In contrast, for a read-only database, the log cannot be rebuilt because the primary file cannot be updated. Therefore, when you attach a read-only database with a log that is unavailable, you must provide the log files, or the files in the FOR ATTACH clause.
Koen Verbeeck
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Pretty easy if you had to attach the AdventureWorks MDF files multiple times :-D


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kapfundestanley
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A simple one for me thank you very much.

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EL Jerry
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Thanks for the question.

I agree that both options may be correct, depending if the database was shut down cleanly AND only one log file existed for the database file. BOL specifies:

- "If multiple log files exist, they must all be available."

and

- "If a read/write database has a single log file that is currently unavailable, and if the database was shut down with no users or open transactions before the attach operation, FOR ATTACH automatically rebuilds the log file and updates the primary file."

in the FOR_ATTACH option.

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TomThomson
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Like those who commented earlier, I think both options work (provided there was a clean shutdown). I picked the second because although I knew the first optioopn would also work I guessed that the question's author didn't.

Tom

nerosdk71
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Why don't you remove a question or clarify it when it is clearly wrong and both answers are working.

I have tested it on my SQL Server and the "wrong" option works fine.

Soren
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