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if @debug <> 0 select @chvDeviceName chvDeviceName, @chvFileName chvFileName if @intErrorCode = 0 begin EXEC sp_addumpdevice 'disk', @chvDeviceName, @chvFileName set @intErrorCode = @@Error end -- 15061 it is OK if dump device already exists if @intErrorCode = 0 or @intErrorCode = 15061 begin BACKUP LOG @chvDbName TO @chvDeviceName set @intErrorCode = @@Error end return @intErrorCode
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TIP: Some might argue that such a stored procedure and job are not needed in Microsoft SQL Server 2000 and 7.0, since it can increase the size of a transaction log automatically if it approaches its specified limit. This is true but only valid if you can afford unlimited storage. If your disk resources Ware limited, it is a much better solution to clear the log.
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Microsoft has significantly improved Job Scheduler (formerly known as Task Scheduler in SQL Server 6.x) in SQL Server 7.0 and 2000.
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Steps are included as components of jobs to allow better control. The user can continue or even stop execution from different points, depending on the success or failure of each step. Operators can be notified according to predefined criteria.
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Each step can be coded in a different language (including Transact-SQL, ActiveX Script, operating system commands, or commands to replication and maintenance services and utilities).
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In the past, the only way to create a complex job was to code everything in Transact-SQL. Now, simpler jobs can be implemented using steps. If you really need a sophisticated solution, you still need the power of Transact-SQL or ActiveX Script. SQL Server includes a set of stored procedures and extended stored procedures inside Enterprise Manager that can achieve everything that you can do within Job Scheduler. They reside in the msdb database. (This database is used by SQL Server Agent to hold information about jobs, schedules, and operators.) In the following paragraphs, we will quickly review some of these numerous stored procedures.
Stored Procedures for Maintaining Jobs
The sp_help_job stored procedure returns information about jobs. If no parameters are specified, the stored procedure returns a resultset with a list of jobs and their attributes. If the job name (or ID) is specified, the stored procedure returns an additional resultset that describes the job s steps, schedules, and target servers. The sp_add_job, sp_delete_job, and sp_update_job stored procedures are used to create, delete, and change existing jobs. The sp_add_jobstep and sp_add_jobschedule are designed to associate a schedule and steps with an existing job. Naturally, there are also stored procedures that allow you to delete or update schedules and steps and obtain information about them. The following example creates a single-step job to perform a backup of the transaction log and assigns a nightly schedule to it:
USE msdb EXEC sp_add_job @job_name = 'Asset Backup Log', @enabled = 1, @description = 'Backup transaction Log of Asset database', @owner_login_name = 'sa', @notify_level_email = 2,
SQL Server 2000 Stored Procedure Programming
@notify_email_operator_name = 'dejan' EXEC sp_add_jobstep @job_name = 'Asset Backup Log', @step_name = 'Backup Log', @subsystem = 'TSQL', @command = ' BACKUP LOG Asset TO bkpAssetLog' @retry_attempts = 5, @retry_interval = 5 EXEC sp_add_jobschedule @job_name = ' Asset Backup Log ', @name = 'Nightly Backup', @freq_type = 4, -- daily @freq_interval = 1, @active_start_time = '23:00:00'
I do not think that you will use this technique very often. It is much easier to create jobs, schedules, and steps from Enterprise Manager. It is more likely that you will use sp_start_job to instruct SQL Server Agent to run the job immediately, as in the following example:
USE msdb EXEC sp_start_job @job_name = 'Asset Backup Log'
There is also an orthogonal stored procedure sp_stop_job that is designed to stop execution of a job that is in progress. Once a job is completed, SQL Server agent will record its success in history. You can view the history of a job using sp_help_jobhistory, or you can delete old records from history using sp_purge_jobhistory.
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