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Oracle DBA Q&A
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Q: In Oracle it is quite well known that sending e-mail via UTL_SMTP can impact application performance if you are waiting for a call to the UTL_SMTP package to complete Therefore, the recommended approach is to submit the action of sending an e-mail to a job that will then send the e-mail asynchronously If sp_send_dbmail places the e-mail in queue, does that mean it doesn t have the same performance impact A: Correct When sending e-mail via sp_send_dbmail, the call to the stored procedure places the e-mail in an internal queue that is asynchronously serviced, so there is no need to wait for the stored procedure to connect to an SMTP server and all the other actions that can slow down the operation Another great difference is that if you make a call to sp_send_dbmail within a transaction and that transaction is rolled back, the e-mail never gets sent because it is queued in an internal table that is subject to the same transaction In UTL_SMTP, if you perform the send action and then later roll back the transaction, you cannot undo the sending of the message
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10: Scheduling, Automation, and Aler ting
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Similar to the Notification Methods settings in Database Control, when automated features such as jobs and alerts need to send e-mail in SQL Server, the Database Mail profile specified in the settings within SQL Server Agent is used Figure 10-2 shows the Alert System page of the SQL Server Agent Properties dialog box (accessed by right-clicking SQL Server Agent in SSMS and selecting Properties) E-mail capability has been enabled, and the mail profile SQL Agent Profile has been selected
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The notification of administrators of events such as jobs completing successfully, jobs failing, or alerts being raised is provided through the use of operators Operators are quite simply aliases for individuals or groups who you want to be notified when an event has taken place
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Figure 10-2 SQL Server Agent Properties dialog box, Alert System page
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Later in the chapter, when we explore setting up jobs and alerts, you will see where operators are used For now, let s take a look at where they are located and how to create them Figure 10-3 shows the list of operators on the local server, with a mix of individuals and group aliases such as First Line Support and DBA Team There are three system stored procedures for operator maintenance: sp_add_operator Creates new operators sp_update_operator Updates existing operators sp_delete_operator Deletes existing operators To create an operator graphically, right-click the Operators node in SSMS (shown in Figure 10-3), select New Operator, and complete the relevant fields Clicking OK creates a call to the sp_add_operator stored procedure When you create a new operator, you will notice that there are three notification types that are currently available: Email Pager net send It is important to note that the Pager and net send options are both due to be removed in a future version of SQL Server and therefore should not be used for any new implementations
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Figure 10-3 Listing of available operators
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10: Scheduling, Automation, and Aler ting
ON THE JOB
The Pager and net send options are a bit of a relic from the past In days gone by, when pagers were the main method of text-based communication, adding this functionality into SQL Server made sense; these days, with mobile telephones that can receive e-mail and e-mail servers that can convert e-mail to SMS, these options are no longer required For those of you familiar with the Windows platform, you know that net send is a way to send a message to another Windows workstation Performing a net send command pops up a dialog box on the desktop of the target computer The increase of security in network environments has resulted in most firewalls blocking the ports used by net send Figure 10-4 shows the creation of a new operator and the disabling of an existing one using T-SQL The new operator 'Wendy Anderson' has been added using the sp_add_operator stored procedure The existing operator 'James Fox' has been disabled using the sp_update_operator stored procedure Disabling an operator prevents them from receiving notifications but does not remove them from the system
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