SQL Server 定时清理数据库日志文件

USE [msdb]
GO

/****** Object:  Job [ClearDBLog]    Script Date: 2020/6/15 13:44:38 ******/
BEGIN TRANSACTION
DECLARE @ReturnCode INT
SELECT @ReturnCode = 0
/****** Object:  JobCategory [Database Maintenance]    Script Date: 2020/6/15 13:44:38 ******/
IF NOT EXISTS (SELECT name FROM msdb.dbo.syscategories WHERE name=N'Database Maintenance' AND category_class=1)
BEGIN
EXEC @ReturnCode = msdb.dbo.sp_add_category @class=N'JOB', @type=N'LOCAL', @name=N'Database Maintenance'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

END

DECLARE @jobId BINARY(16)
EXEC @ReturnCode =  msdb.dbo.sp_add_job @job_name=N'ClearDBLog', 
		@enabled=1, 
		@notify_level_eventlog=2, 
		@notify_level_email=0, 
		@notify_level_netsend=0, 
		@notify_level_page=0, 
		@delete_level=0, 
		@description=N'无描述。', 
		@category_name=N'Database Maintenance', 
		@owner_login_name=N'sa', @job_id = @jobId OUTPUT
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
/****** Object:  Step [ClearDBLogStep1]    Script Date: 2020/6/15 13:44:38 ******/
EXEC @ReturnCode = msdb.dbo.sp_add_jobstep @job_id=@jobId, @step_name=N'ClearDBLogStep1', 
		@step_id=1, 
		@cmdexec_success_code=0, 
		@on_success_action=1, 
		@on_success_step_id=0, 
		@on_fail_action=2, 
		@on_fail_step_id=0, 
		@retry_attempts=0, 
		@retry_interval=0, 
		@os_run_priority=0, @subsystem=N'TSQL', 
		@command=N'ALTER DATABASE [DigitalFactory_60] SET RECOVERY SIMPLE WITH NO_WAIT  
GO
--设置数据库恢复模式为简单
ALTER DATABASE [DigitalFactory_60] SET RECOVERY SIMPLE;
GO
--收缩日志文件
DBCC SHRINKFILE (N''DigitalFactory_60_log'', 11, TRUNCATEONLY);
GO
ALTER DATABASE [DigitalFactory_60] SET RECOVERY FULL WITH NO_WAIT  
GO  
--恢复数据库还原模式为完整
ALTER DATABASE [DigitalFactory_60] SET RECOVERY FULL', 
		@database_name=N'DigitalFactory_60', 
		@flags=0
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_update_job @job_id = @jobId, @start_step_id = 1
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobschedule @job_id=@jobId, @name=N'ClearDBLogPlan', 
		@enabled=1, 
		@freq_type=4, 
		@freq_interval=1, 
		@freq_subday_type=1, 
		@freq_subday_interval=0, 
		@freq_relative_interval=0, 
		@freq_recurrence_factor=0, 
		@active_start_date=20200615, 
		@active_end_date=99991231, 
		@active_start_time=0, 
		@active_end_time=235959, 
		@schedule_uid=N'bddeed70-2db4-4041-99d5-376dadc7870e'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @jobId, @server_name = N'(local)'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
COMMIT TRANSACTION
GOTO EndSave
QuitWithRollback:
    IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION
EndSave:
GO

其中，DigitalFactory_60为数据库文件名称，DigitalFactory_60_log为数据库日志文件名称。

具体在使用的时候，将数据库文件名称和数据库日志文件名称替换为自己数据库的相关文件名称，然后在数据库查询框中执行以上代码，就会生成SQL Server代理作业（数据库需要启用SQL Server代理服务）。

 右键点击“属性”，在弹出界面中选择“计划”

 双击右侧的计划列表，可以设置作业运行的频率。