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https://support.microsoft.com/en-us/help/2727217/distribution-agent-reports-the-transactional-replication-latency-incor
Nov 19, 2012 · The Distribution:Delivery Latency performance counter in Performance Monitor Cause This problem occurs because an incorrect calculation intermittently occurs during the …
http://publib.boulder.ibm.com/tividd/td/ITMD/SC23-4852-00/en_US/HTML/mssql511rg66.htm
Microsoft SQL Server Distribution Delivery Latency too high indication. Occurs when the duration time for transactions to be delivered to the Distributor and applied at the Subscriber exceeds the Distribution Delivery Latency upper bound threshold. This indication monitors the number of seconds a replicated transaction remains in the distribution database before it is delivered to the subscription server.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4250427/
Length of latency was calculated in days by subtracting the time of delivery from the time of membrane rupture. Results At each week of gestation, median latency between 24-28 weeks was similar at approximately 9 days, but was significantly shorter with PPROM at 29, 30, and 31 weeks (p<0.001).Author: Alan M. Peaceman, Yinglei Lai, Dwight J. Rouse, Catherine Y. Spong, Brian M. Mercer, Michael W. Varn...
https://bravenewgeek.com/everything-you-know-about-latency-is-wrong/
Dec 12, 2015 · Latency almost never follows a normal, Gaussian, or Poisson distribution, so looking at averages, medians, and even standard deviations is useless. Latency tends to be heavily multi-modal, and part of this is attributed to “hiccups” in response time.
https://www.mssqltips.com/sqlservertip/3598/troubleshooting-transactional-replication-latency-issues-in-sql-server/
Replendlsn - LSN of the next commit record awaiting delivery to the distribution database Using the above information you can determine how good the overall replication latency is. The higher the value you see in "replication transactions rate/sec" the better the data transfer speed for replication.
https://www.sqlservercentral.com/articles/replication-distribution-agent-monitoring
Oct 03, 2013 · Summary. The distribution agent is a key component to the SQL Server Replication architecture. Using get_distribution_status combined with tools like the Replication Monitor, MSdistribution_status, latency monitoring, etc., DBA’s can really put their thumb on the pulse of replication and hopefully tackle some of the most common replication problems.4.9/5(20)
https://www.sqlservergeeks.com/sql-server-replication-log-reader-latency-occurs/
After a while when you see the first huge transaction is all read then you will see the latency increases for the log reader. So to draw our conclusion, the latency is calculated based on past transactions and not the currently read transactions.
https://repltalk.com/2010/02/21/transactional-replication-conversations/
Distribution Agent Writer Latency The Writer-Thread calls Replication created stored procedures to apply changes to the subscriber. These sp’s rely on a user table’s unique index (usually primary key) to locate records to be updated or deleted.
https://www.mssqltips.com/sqlservertip/2590/determine-data-latency-between-publisher-and-subscriber-in-sql-server-transactional-replication/
If there are any replication commands that remain to be applied at the subscriber from the distribution database you would see the details in the 'Undistributed commands'. From this tab, you would get an idea of estimated time remaining to apply commands at the subscriber.Author: Mohammed Moinudheen
https://docs.microsoft.com/en-us/sql/relational-databases/system-tables/msdistribution-history-transact-sql
The latency between the command entering the distribution database and being applied to the Subscriber since the last history entry. In milliseconds. delivered_transactions
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