How to delete the log file

I want to delete the log file of a database but it says it cannot delete the mail transaction log.

From the SQL Analyzer y get a message that says that the log file is not available. It is 500GB in size.

How can I delete it or truncate it?
robrodpAsked:
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perezjosConnect With a Mentor Commented:
Hello,

Make a backup of your DB. Dettach the database. Delete the log file. Attach the database, this will recreate a new log file.

Jose
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arbertCommented:
You can NOT delete the log file.  You can truncate it doing something like this in query analyzer:

backup log YOURDATABASENAMEHERE with truncate_only
go
DBCC SHRINKFILE(YOURDATABASENAMEHERE_log,0)


Brett
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robrodpAuthor Commented:
Thanks

Now I have this process and the log file starts growing and growing (takes about 28 hours, 500 million records) until there is no more disk space for the log file. Is there a way to process without the log file. I undertand de recovery issues. However it is importante to know
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arbertConnect With a Mentor Commented:
Change the recovery model on the database to SIMPLE (right click on the database in enterprise manager, choose properties--its on the last tab).

500million records?  How are you inserting (bulk insert I would hope?)
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arbertCommented:
Oh my gosh, close some of your open questions!
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arbertCommented:
"Make a backup of your DB. Dettach the database. Delete the log file. Attach the database, this will recreate a new log file."

You should never rely on this  method...SQL Server will NOT always recreate the LDF file.....
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perezjosCommented:
Hello,

robrodp glad you finally solved your problem. Thanks for the points.

arbert:

If a database comprises only a single data file and a single transaction log file, the database can be attached to an instance of  SQL Server without using the transaction log file, provided the database was cleanly shut down with no users and no open transactions. When the data file is attached, SQL Server creates a new transaction log file automatically.
The database must have been successfully detached from SQL Server using the sp_detach_db system stored procedure.
Single-file databases are useful .All the data is stored in a single file; attaching the single file to SQL Server automatically re-creates a transaction log so that the database can be used.

Jose





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arbertCommented:
"If a database comprises only a single data file and a single transaction log file, the database can be attached to an instance of  SQL Server without using the transaction log file, provided the database was cleanly shut down with no users and no open transactions. When the data file is attached, SQL Server creates a new transaction log file automatically. "

Yes in the perfect world--this isn't a good idea if you value your data....Look at all the questions on the site in which it DIDN'T recreate the log....Experience teaches....
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perezjosCommented:
Well, in this case it worked !


Thanks

jose


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arbertCommented:
Lucky for you
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