Create Alerting System in Transcational replication

Question

Hi,
Server A -->publisher and Distributor
Server B -->Subscriber
TX Replication,Pull Subscription.
Q:) we have configured replication and we are monitoring the replication using the following command
exec [distribution].sys.sp_replmonitorhelpsubscription @publisher = @@ServerName, @publication_type=0
GO
from this query we checking the status column for monitoring the replication.
at some time some subscription are missing where the data in publication and subscription are mismatch.
so,we execute the above query it looks fine that it cant displaying the subscription. In Replication monitor when we check particular publisher there is no subscription for that particular publisher. but in subscriber the subscription is present. so what
we do that is delete the subscription and recreate the subscription and make the re-initilize the subscription.
what we want is --> why the subscription is missing how can we find out it reasons ?
how to create a alert for this type of monitoring when subscription is missing(we check the column never expire subscriptionies)?

Answer 1

I maintain a table with the following schema and then have a job that executes a stored procedure that performs various checks (a management procedure that executes a dedicated procedure per each specific check). Regarding this specific request I use a procedure
called "sp_MonitorReplicationMissingSubscriptions", see code bellow. It is very simple and does the job. Based on this this method we also monitor missing articles, inactive articles, inactive subscriptions and more...
The idea is to compare the replication meta data (replication tables) against that reference table.
For easy mangemnet our add artcle and drop article scripts also populates that table or deletes from the table.
CREATE TABLE [dbo].[ReplicationConfiguration](
[InsertDate] [datetime] NOT NULL,
[Database] [sysname] NOT NULL,
[Publication] [sysname] NOT NULL,
[Article] [sysname] NOT NULL,
[NumSubscribers] [sysname] NULL,
[IsActive] [char](1) NOT NULL,
CONSTRAINT [PK_ReplicationConfiguration] PRIMARY KEY CLUSTERED
[Database] ASC,
[Publication] ASC,
[Article] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
) ON [PRIMARY]
-- This is how the proc is called from the management procedure (outer procedure) populating a temp table which when all is OK has no rows and if there are rows a mail is sent
SELECT @cmd = NULL;
SELECT @cmd = N'INSERT #Data (Monitor, Article, Publication, NumSubscribers) EXEC [' + @Database + '].dbo.sp_MonitorReplicationMissingSubscriptions
@Publication = ''' + @Publication + ''', @Article = ''' + @Article + ''' , @NumSubscribers = ''' + @NumSubscribers + ''';';
--PRINT @cmd;
EXEC (@cmd);
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[sp_MonitorReplicationMissingSubscriptions]') AND type in (N'P', N'PC'))
DROP PROCEDURE [dbo].sp_MonitorReplicationMissingSubscriptions
GO
CREATE PROCEDURE [dbo].[sp_MonitorReplicationMissingSubscriptions]
@Publication sysname,
@Article sysname,
@NumSubscribers sysname
Yaniv Etrogi 31/01/2009
Get articles with missing subscriber
AS
SET NOCOUNT ON;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
--EXEC dbo.sp_MonitorReplicationMissingSubscriptions @Publication = 'BurstingDB', @NumSubscribers = '1';
-- Throw an exp and exit if the current db is not replicated
IF NOT EXISTS (SELECT * FROM sys.tables WHERE name = N'syssubscriptions')
BEGIN;
DECLARE @DBName sysname; SELECT @DBName = UPPER(DB_NAME());
RAISERROR (N'Database ''%s'' is not replicated. Stored procedure ''sp_MonitorReplicationMissingSubscriptions'' needs to be run on Published databases only.', 10, 1, @DBName );
RETURN;
END;
-- Verify that for each article there is an active subscription.
SELECT
'sp_MonitorReplicationMissingSubscriptions'
,A.name AS Article
,P.name AS Publication
,COUNT(s.artid) AS Cnt
FROM dbo.sysarticles A
LEFT JOIN dbo.syssubscriptions S ON A.artid = S.artid
LEFT JOIN dbo.syspublications P ON P.pubid = A.pubid
WHERE P.name = @Publication AND A.name = @Article
AND S.dest_db NOT LIKE 'virtual' AND S.srvid <> -1
GROUP BY P.name, A.name
HAVING COUNT(S.artid) <> @NumSubscribers ;
GO
EXEC sp_ms_marksystemobject 'sp_MonitorReplicationMissingSubscriptions';
Yaniv Etrogi
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