SQL Server 定時清理數據庫日志文件

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'無描述。', 
		@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
--設置數據庫恢復模式為簡單
ALTER DATABASE [DigitalFactory_60] SET RECOVERY SIMPLE;
GO
--收縮日志文件
DBCC SHRINKFILE (N''DigitalFactory_60_log'', 11, TRUNCATEONLY);
GO
ALTER DATABASE [DigitalFactory_60] SET RECOVERY FULL WITH NO_WAIT  
GO  
--恢復數據庫還原模式為完整
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為數據庫文件名稱，DigitalFactory_60_log為數據庫日志文件名稱。

具體在使用的時候，將數據庫文件名稱和數據庫日志文件名稱替換為自己數據庫的相關文件名稱，然后在數據庫查詢框中執行以上代碼，就會生成SQL Server代理作業（數據庫需要啟用SQL Server代理服務）。

 右鍵點擊“屬性”，在彈出界面中選擇“計划”

 雙擊右側的計划列表，可以設置作業運行的頻率。