Make SQL Server to talk you!Antonios ChatzipavlisSoftware Architect , Development Evangelist, IT ConsultantMCT, MCITP, MCPD, MCSD, MCDBA, MCSA, MCTS, MCAD, MCP, OCAMVP on SQL SERVER

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Objectives• SQL Server Agent Alert System• Event Notifications

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What Is an Alert?

• Predefined response to an event• Triggered by jobs, performance conditions, or

application log events • Can notify an operator or start a specified job

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Create an Alert

Specify

Alert name

Condition (Event, WMI trigger, performance condition) that triggers the alert

Response – notify an operator, start a job

Use SQL Server Management Studio or “sp_add_alert”

EXEC dbo.sp_add_alert @name = N'Test Alert', @message_id = 55001, @severity = 0,

@notification_message = N'Error 55001 has occurred. The database will be backed up...',

@job_name = N'Back up the AdventureWorks Database' ;

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Responding to Alerts

Launch a Job

Use an existing job

Create a new job

Notify an Operator

Schedule responders for different parts of the day or week

E-mail, pager, or net send

Either

Or

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DEMOUsing Alerts

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Overview of Event Notifications• Messages containing event data

DDL EventsTrace EventsDML EventsDatabase and Server Events

• Sent to an event processing service by usingService Broker

A message type and contract are predefinedYou must create a queue, a service, and a route

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Creating Event Notifications

1. Define the Event Notification2. Specify the Scope3. Specify the Event4. Specify the Service

CREATE EVENT NOTIFICATION NotifyALTER_T1 ON DATABASE FOR ALTER_TABLE TO SERVICE '//Adventure-Works.com/ArchiveService' , '8140a771-3c4b-4479-8ac0-81008ab17984';

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Processing Event Notifications

1. Receive the message2. Extract event data by using XQuery

DECLARE @messageTypeName NVARCHAR(256),@messageBody XML

;RECEIVE TOP(1) @messageTypeName = message_type_name,@messageBody = message_bodyFROM dbo.NotifyQueue;

IF @@ROWCOUNT = 0RETURN

DECLARE @cmd nvarchar(1000)DECLARE @posttime nvarchar(24)DECLARE @spid nvarchar(6)

SET @cmd = @messagebody.value('(/EVENT_INSTANCE/TSQLCommand/CommandText)

[1]','nvarchar(100)')

SET @messagebody.value('(/EVENT_INSTANCE/PostTime)

[1]','nvarchar(24)')SET @spid = @messagebody.value

('(/EVENT_INSTANCE/SPID)[1]','nvarchar(6)')

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Managing Event Notifications

1. Viewing event notifications and queues2. Deleting event notifications

SELECT name FROM sys.event_notificationsSELECT definition FROM sys.service_queues

DROP EVENT NOTIFICATION UpdateStats ON SERVER

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DEMOImplementing Event Notifications

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Q & A

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My Blogs

http://www.autoexec.gr/blogs/antonch

http://www.dotnetzone.gr/cs/blogs/antonch

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Thank you