SQL Server Replication – Find the number of undelivered transactions from a Publisher

The below mentioned script helps us to find the number of undelivered transactions from the publisher.
Courtesy: http://www.sqlsoldier.com/wp/sqlserver/countingunreplicatedcommandsandtransactions

With MaxXact (ServerName, PublisherDBID, XactSeqNo)
 As (Select S.name, DA.publisher_database_id,
 From distribution.dbo.MSdistribution_history H with(nolock)
 Inner Join distribution.dbo.MSdistribution_agents DA with(nolock)
On DA.id = H.agent_id
 Inner Join master.sys.servers S with(nolock)
 On S.server_id = DA.subscriber_id
 Group By S.name, DA.publisher_database_id)
 Select MX.ServerName, MX.PublisherDBID,
COUNT(*) As TransactionsNotReplicated
 From distribution.dbo.msrepl_transactions T with(nolock)
 Right Join MaxXact MX On
MX.XactSeqNo < T.xact_seqno And
MX.PublisherDBID = T.publisher_database_id
 Group By MX.ServerName, MX.PublisherDBID;

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