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Cross Database Ownership Chaining
Hey everyone, I have a server that over the last week has had to Procedures use bad execution plans when over the last couple years that this machine has been online it has never happened. I am not sure if I am looking at 2 different causes. To make the question quick and short... When Cross Database Owner Ship chaining is invoked would it cause the execution plans to rebuild when cross database procs are being executed? I had an application that needed to have the account it used to have its account information changed. (Was using sa, now moved to a specific account). The app needs the database chaining enabled since it has lost SA access. Is there any relation that can be drawn from... 1) I created the new account 2) Moved the app from SA over to new account 3) Determined that chaining needed to be enabled 4) Enabled the chaining job 5) Now the app has the ability to call a proc that calls a nested proc in a different database. The permissions work fine, but would a new execution plan be needed? I don't see why it would, but the timing is there. I just want to double check before I eliminat this as a possibility.
I'll need to test it, but I think the answer is yes. Setting up several other tests at the moment. I'll get to this on ASAP
Thanks, That is what I thought, but I wanted to get another opinion before I sent that along as an answer.
Yes. Testing confirms it. If you change the cross database ownership chain setting on the database it removes the queries from cash. You can test it with this really simple query: SELECT deqs.creation_time FROM sys.dm_exec_query_stats AS deqs CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest CROSS APPLY sys.dm_exec_query_plan(deqs.plan_handle) AS deqp WHERE dest.text LIKE 'CREATE PROCEDURE x%' I created a procedure & executed it then changed the settings on the database. It removed the proc from cache. The next time you run the proc it has a new create_time value.
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