c# barcode reader usb Figure 10-19 Alerts are located under SQL Server Agent in VS .NET

Encoder Quick Response Code in VS .NET Figure 10-19 Alerts are located under SQL Server Agent

Figure 10-19 Alerts are located under SQL Server Agent
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Figure 10-20 New Alert dialog box
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Full details of all performance objects and counters can be found in SQL Server Books Online Figure 10-22 shows the details for SQLServer:Transactions in Books Online Clicking on the Response page on the left side of the New Alert dialog box presents us with a series of options to determine what to do when the alert has been raised, as shown in Figure 10-23 We have two available options: enable the alert to take corrective action by executing a job, and notify one or more operators In this example, we have chosen to
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Figure 10-21 New Alert dialog box with completed details
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notify the DBA Team operator via e-mail that this alert has been raised On this occasion we have decided not to automate the response with any corrective action Finally, we select the Options page (see Figure 10-24) and choose to include in the response e-mail the error text from the alert and some text of our own The last option on this page is to select the duration of the delay between responses Depending on the type of event you are monitoring, the event may occur multiple times in a short period Setting the delay between responses ensures that even if the event occurs multiple times, it will only produce a response to the alert once until the delay period has lapsed We set our delay to 60 minutes
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Figure 10-22 Books Online details for SQLServer:Transactions
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Now that we have completed all the required information for the alert, we click OK SQL Server then creates the alert and starts to monitor for the alert condition In the previous example, clicking OK on the New Alert dialog box creates and executes calls to system stored procedures found in msdb Three system stored procedures are used for creating, updating, and deleting alerts: sp_add_alert sp_update_alert sp_delete_alert
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Figure 10-23 Response options for the new alert
The notifications are managed separately from an alert and are managed using sp_add_noti cation sp_update_noti cation sp_delete_noti cation Figure 10-25 shows examples of how to work with alerts using T-SQL script and the system stored procedures Notice that the initial call to sp_add_alert creates the alert
10: Scheduling, Automation, and Aler ting
Figure 10-24 Options page
definition but does not add the notification The notification is created with a call to sp_add_notification The script also shows how to update the alert using sp_update_alert In this example, setting the enabled flag to 0 disables the alert, preventing it from responding, but without removing the alert definition from the system Finally, the script shows a call to sp_delete_alert, which removes the alert from the system sp_delete_alert also removes
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Figure 10-25 Create, update, and delete alerts using system stored procedures
any notifications associated with the alert for you so you do not have to make your own calls to sp_delete_notification To view how many times an alert has been raised and when it was last raised and responded to, right-click the alert within SSMS and select Properties On the alert properties screen, select the History page Figure 10-26 shows the history of the 'tempdb - Running low on space' alert Up to this point we have looked at creating alerts based on predefined conditions It is also possible to create and raise your own errors and to then create alerts that can respond to those events For example, you may decide to create your own error message
10: Scheduling, Automation, and Aler ting
Figure 10-26 Alert history
within your application When the application raises the error, an alert can respond to the error by running a predefined script configured as a SQL Server Agent job
NOTE
When a feature such as SQL Server Replication (covered in 11), which is used to replicate subsets of data, is used, it will create its own set of custom alerts in a disabled state As a DBA, you would then enable the alerts of interest and associate operators with them to receive notifications
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