Analyze Transaction Log Hierarchy

Paul Randal has written code to determine how much log an operation has generated:

Over the weekend there was a discussion on the MVP distribution list about the sys.dm_tran_database_transactions DMV and how one cannot use it to accurately determine how much log an operation has generated because it doesn’t provide a roll-up of the sub-transaction metrics to the outer transaction. This makes the output somewhat non-intuitive.

The discussion prompted me to write some code I’ve been meaning to do since 2012, when SQL Server 2012 introduced a field in LOP_BEGIN_XACT log records that tracks the transaction ID of the parent transaction, allowing the hierarchy of transactions to be investigated.

The actual code is at the bottom of the article, and is available in a zip file here.

It provides two stored procs, sp_SQLskillsAnalyzeLog and sp_SQLskillsAnalyzeLogInner, with the former making use of the latter, and the latter calling itself recursively.

I’d consider this squarely in the advanced troubleshooting realm.  Definitely read the whole thing and Paul’s code.

Related Posts

Creating Graph Tables in SQL Server

Mala Mahadevan continues a series on graph tables in SQL Server: I have highlighted in red what SQL Server adds to the table – the two system columns – graph id, which is bigint, and node id, which is nvarchar and stores json, and the unique index to help with queries. We can also see […]

Read More

strace and SQL Server Containers

Anthony Nocentino tries using strace to diagnose SQL Server process activity in a container: We’re attaching to an already running docker container running SQL. But what we get is an idle SQL Server process this is great if we have a running workload we want to analyze but my goal for all of this is […]

Read More

Categories

May 2016
MTWTFSS
« Apr Jun »
 1
2345678
9101112131415
16171819202122
23242526272829
3031