Limitations In sys.dm_exec_query_plan

Brent Ozar shows a limitation in the sys.dm_exec_query_plan DMV:

The query with six joins has a cached plan that you can click on – because it’s from sys.dm_exec_query_plan, a management object that returns execution plans as XML.

The query with seven joins does not. Its cached plan is too large or complex for that DMV. Microsoft quickly realized this problem when 2005 came out, so in 2005 Service Pack 2, they introduced sys.dm_exec_text_query_plan. That function returns bigger data – but it only comes back in text format.

There are a couple of workarounds, at least, but they aren’t ideal.

Related Posts

Dealing With The Registry From SQL Server

Wayne Sheffield shows how to read and modify registry entries using SQL Server: xp_instance_regread In this example, I used xp_regread to read the direct registry path. If you remember from earlier, there are SQL Server instance-aware versions of each registry procedure. A comparable statement using the instance-aware procedure would be: 1 2 3 4 EXECUTE […]

Read More

Taking Control In The Cloud

Arun Sirpal advises you to enjoy the change in control when moving to Azure: The key for me has been to “embrace the change”. I have come from a traditional DBA background, backups, consistency checks, server level configuration at the heart of things. Yes, I no longer care about SQL backups and things of that […]

Read More

Categories

June 2017
MTWTFSS
« May Jul »
 1234
567891011
12131415161718
19202122232425
2627282930