The Blocking Monitoring Framework

Dmitri Korotkevitch announces a new tool:

Troubleshooting of the blocking and concurrency issues is, in the nutshells, a simple process. You need to identify the processes involved in blocking conditions or deadlocks and analyze why those processes acquire the locks on the same resources. In majority of cases, you need to analyze queries and their execution plans identifying possible inefficiencies that led to excessive number of locks being acquired.

Collecting this information is not a trivial task. The information is exposed through DMVs (you can download the set of scripts here); however, it requires you to run the queries at time when blocking occurred. Fortunately, SQL Server allows you to capture blocking and deadlock conditions with the blocked process report and deadlock graph, analyzing them later.

There is the caveat though. Neither blocked process report nor deadlock graph provide you execution plans of the statements. Nor do they always include affected statements in the plain text. You may need to query plan cache and other DMVs to get this information and longer you wait lesser is the chance that the information is available. Moreover, SQL Server may generate enormous number of blocked process reports in cases of prolonged blocking and complex blocking chains, which complicates the analysis.

Confirmed to work with SQL Server 2012 and later, but might work on earlier versions as well.  Dmitri has released it to the public, so check it out.

Related Posts

Visualizing Deadlocks In SQL Sentry & Plan Explorer

Aaron Bertrand shows off new functionality in SQL Sentry and SentryOne Plan Explorer around deadlock visualization: There’s a lot going on there, but much of it is noise. There is a whole bunch of contention on the table SqlPerf.Session — session 342 is trying to perform an update, but it is stuck waiting on shared locks taken […]

Read More

Blocking A Truncate Statement

Arun Sirpal shows that the TRUNCATE command needs to take locks like any other data modification command: The truncate option is fast and efficient but did you know that it takes a certain lock where you could actually be blocked? What am I talking about? When you issue a truncate it takes a Sch-M lock and […]

Read More

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Categories

August 2018
MTWTFSS
« Jul  
 12345
6789101112
13141516171819
20212223242526
2728293031