運行SqlAgent作業時的權限問題

Question

當我嘗試運行Sql代理作業時，我正在檢查是否沒有先前的實例在同一時間運行。下面的查詢給出：

IF NOT EXISTS(SELECT 
          1 
         FROM msdb.dbo.sysjobactivity ja 
         LEFT JOIN msdb.dbo.sysjobhistory jh 
          ON ja.job_history_id = jh.instance_id 
         JOIN msdb.dbo.sysjobs j 
         ON ja.job_id = j.job_id 
         JOIN msdb.dbo.sysjobsteps js 
          ON ja.job_id = js.job_id 
          AND ISNULL(ja.last_executed_step_id,0)+1 = js.step_id 
         WHERE ja.session_id = (SELECT TOP 1 session_id FROM msdb.dbo.syssessions ORDER BY agent_start_date DESC) 
         AND j.name = N'JobName' 
         AND start_execution_date is not null 
         AND stop_execution_date is null 
       ) 
       BEGIN 
       -- code to run the job 
       END 

但是，我得到的是

The SELECT permission was denied on the object 'syssessions', database 'msdb', schema 'dbo'. [SQLSTATE 42000] (Error 229).

該步驟失敗的錯誤。作業步驟由具有sysadmin特權的帳戶運行。

我試圖在msdb數據庫也給db_owner特權的帳戶。仍然面臨同樣的問題。

你能指導我，關於如何解決這個權限問題？

Answer 1

我認爲你不需要手動檢查是否有其他實例在運行。

採樣作業的步驟：

SELECT 1; 
WAITFOR DELAY '00:00:45'; 

並嘗試兩次運行它：

EXEC msdb.dbo.sp_start_job 'job' 
-- Job 'job' started successfully. 

EXEC msdb.dbo.sp_start_job 'job' 

Msg 22022, Level 16, State 1, Line 3

SQLServerAgent Error: Request to run job Job() refused because the job is already running from a request by <>.