SQL 2008 Full Text CONTAINSTABLE is VERY SLOW

Hello,
I am running SQL Server 2008 SP3.
I know I am not the only to have SQL Server CONTAINSTABLE query performances issues. However I think mine is very strange because it appears that the SAME IDENTICAL query produces completely different execution plans on two different sessions against
the same SQL Server/database.
This is the query:
select * from CONTAINSTABLE (TABChiamate,[Domanda],N'"dn"', 20)
My full text index has been completely rebuilt and it contains 1 million of rows.
What is strange about this query is that on the session where it works fine it runs in a fraction of a second, whereas on another session it's REALLY slow - taking 20/30 seconds to run (or minutes, depending on the top_n parameter).
Looking at the execution plans I see that the slow one is doing a TABLE/LAZY SPOOL on 741.000 rows, which making both CPUs of the server spin to 100% for the execution time (20/30 seconds). Obviously this is unacceptable since we have about one hundred of
users that could perform the same query in the same minute and I can't have 100 cores to complete the operation right?
However, I am not able to understand why this issue is strictly related to the Session... new sessions are running fine...
Anyone could help trying to figure out what to look for to explain this strange behavior? I tried to see all SET options to understand if they are different ... now my question is ... is it possible that execution plans are cached in a per-session basis?
Thank you in advance!
Adriano

Hi RFL, thank you for your reply! I try to answer your questions below.
Adriano, A few comments and questions.
1. What build level of SQL Server 2008 are you running?
Microsoft SQL Server 2008 (SP3) - 10.0.5500.0 (X64) Sep 21 2011 22:45:45 Copyright (c) 1988-2008 Microsoft Corporation Standard Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) (VM)
2. Your example query is apparently not identical to the two plans in the screen shots. Could you share two runs of the restricted query?
I just retried the same today and it appears to work correctly... however the main issue is that I am sure I'll face the issue in the next weeks as soon as the full text index will need a rebuild ... :-(
3. How many rows do the unlimited searches return?
127 rows.
4. Is the first query in the set always the slow one? Or, if you switch them around does slow query remain the same?
If you look at the execution plans above, the executed query is the same on 2 connections. I copied/pasted the same query, and on the first query window it was REALLY slow, putting both CPUs at 98% for many seconds/near a minute.
There was a bug reported here with optimization, SQL Server 2008, and Containstable. I cannot tell if the problem is identical to yours, but if you have not updated SQL Server 2008 since mid-2009 you might check for the fix to the following problem:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/003bb682-a7d2-489d-ad0f-123a8206b663/fulltext-search-containstable-near-broken-in-sql-server-2008?forum=transactsql
I've seen, but it seems not my case (I've SP3 and still having issues).
This morning I've seen that the query analyzer window got the connection broken, and I needed to reconnect. After reconnecting the same query window, the query went fast... but I am not able to understand WHY, it looks like the "bad plan"
was cached on the actual connection/process for some reason, and after a timeout it has been recalculated on the rebuilt full-text index... and actually now it works... but I am sure the issue will come back again in some days/week...
RLF
Adriano

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