问题
I have a very large database (50+ GB). In order to free space in my hard drive, I tried deleting old records from one of the tables . I ran the command:
delete from Table1 where TheDate<'2004-01-01';
However, SQL Server 2012 said:
Msg 9002, Level 17, State 4, Line 1
The transaction log for database 'MyDb' is full due to 'ACTIVE_TRANSACTION'.
and it did not delete a thing. What does that message mean? How can I delete the records?
回答1:
Here is what I ended up doing to work around the error.
First, I set up the database recovery model as SIMPLE. More information here.
Then, by deleting some old files I was able to make 5GB of free space which gave the log file more space to grow.
I reran the DELETE statement sucessfully without any warning.
I thought that by running the DELETE statement the database would inmediately become smaller thus freeing space in my hard drive. But that was not true. The space freed after a DELETE statement is not returned to the operating system inmediatedly unless you run the following command:
DBCC SHRINKDATABASE (MyDb, 0);
GO
More information about that command here.
回答2:
Restarting the SQL Server will clear up the log space used by your database. If this however is not an option, you can try the following:
* Issue a CHECKPOINT command to free up log space in the log file.
* Check the available log space with DBCC SQLPERF('logspace'). If only a small
percentage of your log file is actually been used, you can try a DBCC SHRINKFILE
command. This can however possibly introduce corruption in your database.
* If you have another drive with space available you can try to add a file there in
order to get enough space to attempt to resolve the issue.
Hope this will help you in finding your solution.
来源：https://stackoverflow.com/questions/23820741/sql-server-log-is-full-due-to-active-transaction