Shrinking a log file to a specified target size The following example shrinks the log file in the AdventureWorks2008R2 database to 1 MB. To allow the DBCC SHRINKFILE command to shrink the file, the file is first truncated by setting the database recovery model to SIMPLE.

Shrink MSSQL log file

USE ExampleDB;
GO

-- Truncate the log by changing the database recovery model to SIMPLE.
ALTER DATABASE ExampleDB
SET RECOVERY SIMPLE;
GO

-- Shrink the truncated log file to 1 MB.
DBCC SHRINKFILE (ExampleDB_Log, 1);
GO

-- Reset the database recovery model.
ALTER DATABASE ExampleDB
SET RECOVERY FULL;
GO