Make SQL Server to talk you!Antonios ChatzipavlisSoftware Architect , Development Evangelist, IT Consultant

MCT, MCITP, MCPD, MCSD, MCDBA, MCSA, MCTS, MCAD, MCP, OCA

MVP 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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DEMO

Using Alerts

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Overview of Event Notifications

• Messages containing event data

DDL Events

Trace Events

DML Events

Database and Server Events

• Sent to an event processing service by using

Service Broker

A message type and contract are predefined

You must create a queue, a service, and a route

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Creating Event Notifications

1. Define the Event Notification

2. Specify the Scope

3. Specify the Event

4. 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 message

2. Extract event data by using XQuery

DECLARE @messageTypeName NVARCHAR(256),

@messageBody XML

;RECEIVE TOP(1)

@messageTypeName = message_type_name,

@messageBody = message_body

FROM dbo.NotifyQueue;

IF @@ROWCOUNT = 0

RETURN

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 queues

2. Deleting event notifications

SELECT name FROM sys.event_notifications

SELECT definition FROM sys.service_queues

DROP EVENT NOTIFICATION UpdateStats ON SERVER

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DEMO

Implementing 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