ON THE JOB in Visual Studio .NET

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ON THE JOB
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It is very tempting to set the SQL Server Agent service account to be a member of a highly privileged group such as the Windows Administrators group, to make life easy, and on SQL Server systems prior to SQL Server 2005, this is exactly what many lazy DBAs used to do This was not a good security practice and left open potential attack vectors for escalation of privileges In SQL Server 2005, the concepts of proxy accounts and stored credentials were introduced to ease the administrative burden That s not to say that the lazy DBAs magically started to use them!
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To provide SQL Server Agent with the ability to change security context for job steps to an account other than the SQL Server Agent account, proxy accounts are used Proxy accounts provide SQL Server Agent with the ability to change security context using stored credentials (refer to SQL Server Books Online for information on stored credentials) Figure 10-10 shows the Proxies node of SQL Server Agent expanded in SSMS Below the Proxies node are the available proxy types such as Operating System and SSIS Package Execution Let s take the example of a job that will import data to SQL Server using data files located on a remote staging server The job will contain multiple steps The first step in the job needs to be to connect to the remote staging server where the data files ready for import are stored, and then to copy the files to the local machine The second step performs the data import We are just going to concentrate on the first step, which will be of the type Operating System and will perform a copy command The step will need
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Figure 10-10 Available proxies
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Microsoft SQL Server 2008 Administration for Oracle DBAs
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to run under the security context of an account that can connect to the remote server and read the files and then create a copy of the file locally The step could simply run as the SQL Server Agent account, but in our setup we have followed best practice and the account does not have the relevant permissions to perform the operation Therefore, we need to set up a proxy account Figure 10-11 shows the New Proxy Account dialog box (launched by right-clicking Proxies and selecting New Proxy) In the example, the proxy account is called StagingServerFileCopy and maps to a set of stored credentials called StagingServerAccount The stored credentials are for a Windows account that has the relevant file system
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Figure 10-11 Creating a proxy account for operating system calls
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permission to read data from the external server and copy files to the local server The account has been marked as available for use with the operating system subsystem Now within the job step, the StagingServerFileCopy proxy can be used as the account under which the job step should run Figure 10-12 shows the job step with the Run As account set to the new proxy account
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Figure 10-12 Job step with Run As set to the new proxy account
Microsoft SQL Server 2008 Administration for Oracle DBAs
Job Categories
SQL Server creates job categories automatically when you set up features such as replication to group all the replication jobs together for ease of management It is possible to create your own categories and then assign jobs to the categories For example, you could create a category of Batch Extracts and place all extract jobs into the category To manage job categories, right-click the jobs node in SSMS and select Manage Categories Figure 10-13 shows the Manage Job Categories interface It is also possible to manage the categories via script using the following system stored procedures: sp_add_category sp_update_category sp_delete_category
Figure 10-13 Manage Job Categories dialog box
10: Scheduling, Automation, and Aler ting
Shared Schedules
As you have noticed so far, each job can have its own custom schedule assigned Although custom schedules offer the ultimate flexibility, there are scenarios where you would want several jobs to run to the same schedule If that schedule needs to change for example, you might need to move your backup window you would only want to modify one schedule, not the schedule for each individual job Shared schedules give you this ability A shared schedule is a schedule that can be defined once and then reused by several jobs Figure 10-14 shows the Manage Schedules dialog box From here, you can create new and edit/view existing schedules as well as view how many jobs depend on a particular schedule To access these schedules, right-click the Jobs node in SSMS and select Manage Schedules
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