13 January 2022

Distributor With Undelivered Commands

by Grant Fritchey

1,929 0 Replication

Metrics install automatically if you have Redgate Monitor installed.

If you are using Redgate’s SQL Server monitoring tool, Redgate Monitor, you can instantly install and run this metric on your servers.

We can identify when a distributor has undelivered commands. You can’t tell which database it is though. You’ll have to go to the distributor and run queries.

Metric definition

Name

Distributor With Undelivered Commands

Description

We can identify when a distributor has undelivered commands. You can't tell which database it is though. You'll have to go to the distributor and run queries.

The T-SQL query that will collect data


		
			
			
Transact-SQL
			
			SELECT SUM( CASE
WHEN f.xact_seqno > e.xact_seqno THEN
1
ELSE
0
END
) AS UndeliveredCommands
FROM MSpublications (NOLOCK) AS a
JOIN MSpublisher_databases (NOLOCK) AS b
ON b.publisher_id = a.publisher_id
AND b.publisher_db = a.publisher_db
JOIN MSsubscriptions (NOLOCK) AS c
ON c.publisher_database_id = b.id
AND c.publication_id = a.publication_id
CROSS APPLY
(
SELECT ah.agent_id,
ISNULL(MAX(ah.xact_seqno), 0x0) AS xact_seqno,
MAX(time) AS time
FROM MSdistribution_history (NOLOCK) AS ah
WHERE ah.agent_id = c.agent_id
GROUP BY ah.agent_id
) AS e
JOIN MSrepl_commands (NOLOCK) AS f
ON f.publisher_database_id = c.publisher_database_id
AND f.article_id = c.article_id
GROUP BY a.publication
ORDER BY a.publication;
			
				
					
				
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						SELECT SUM( CASE
WHEN f.xact_seqno > e.xact_seqno THEN
1
ELSE
0
END
) AS UndeliveredCommands
FROM MSpublications (NOLOCK) AS a
JOIN MSpublisher_databases (NOLOCK) AS b
ON b.publisher_id = a.publisher_id
AND b.publisher_db = a.publisher_db
JOIN MSsubscriptions (NOLOCK) AS c
ON c.publisher_database_id = b.id
AND c.publication_id = a.publication_id
CROSS APPLY
(
SELECT ah.agent_id,
ISNULL(MAX(ah.xact_seqno), 0x0) AS xact_seqno,
MAX(time) AS time
FROM MSdistribution_history (NOLOCK) AS ah
WHERE ah.agent_id = c.agent_id
GROUP BY ah.agent_id
) AS e
JOIN MSrepl_commands (NOLOCK) AS f
ON f.publisher_database_id = c.publisher_database_id
AND f.article_id = c.article_id
GROUP BY a.publication
ORDER BY a.publication;

Instances to collect from

Instances that act as a distributor

Databases to collect from

distribution

Collection frequency

10 minutes

Use collected or calculated values

Leave the Use a calculated rate of change between collections check box unchecked

Metric collection

ENABLED

Alert definition

Alert name

Description

Raise an alert when the metric value goes

above the defined threshholds

Default threshold values

High:
Medium:
Low:

Raise an alert when the threshold is passed for

collections

Alert is

DISABLED

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Distributor With Undelivered Commands

Metric definition

Name

Description

The T-SQL query that will collect data

Instances to collect from

Databases to collect from

Collection frequency

Use collected or calculated values

Metric collection

Alert definition

Alert name

Description

Raise an alert when the metric value goes

Default threshold values

Raise an alert when the threshold is passed for

Alert is

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