Hello All,
The following script is reproducing the problem assuming you have
Northwind database on the server.
Please note it gives you the error message on line 12.
USE tempdb
GO
sp_addlinkedser ver 'Test17'
GO
sp_setnetname 'Test17', @@SERVERNAME
GO
IF EXISTS (SELECT 1 FROM dbo.sysobjects WHERE id =
object_id(N'[dbo].[This_works]') and OBJECTPROPERTY( id, N'IsProcedure') = 1)
DROP PROCEDURE [dbo].[This_works]
GO
CREATE PROCEDURE This_works
@UseLinkedServe r bit = 0
-- WITH RECOMPILE -- Does not help
AS
SET NOCOUNT ON
IF @UseLinkedServe r = 1 -- Linked Server
BEGIN
IF EXISTS (SELECT 1 FROM dbo.sysobjects where id =
object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY( id, N'IsUserTable')
= 1)
DROP TABLE dbo.Orders_TMP
SELECT * INTO dbo.Orders_TMP FROM Test17.Northwin d.dbo.Orders
END
ELSE -- Local
BEGIN
IF EXISTS (SELECT 1 FROM dbo.sysobjects where id =
object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY( id, N'IsUserTable')
= 1)
DROP TABLE dbo.Orders_TMP
SELECT * INTO dbo.Orders_TMP FROM Northwind.dbo.O rders
SELECT 1 FROM dbo.Orders_TMP WHERE 1 = 2 -- Why do I need this line?
END
BEGIN TRANSACTION
Select 'Line 25'
SELECT COUNT(*) FROM dbo.Orders_TMP
COMMIT
go
IF EXISTS (SELECT 1 FROM dbo.sysobjects WHERE id =
object_id(N'[dbo].[This_does_not]') and OBJECTPROPERTY( id,
N'IsProcedure') = 1)
DROP PROCEDURE [dbo].[This_does_not]
GO
CREATE PROCEDURE This_does_not
@UseLinkedServe r bit = 0
-- WITH RECOMPILE -- Does not help
AS
SET NOCOUNT ON
IF @UseLinkedServe r = 1 -- Linked Server
BEGIN
IF EXISTS (SELECT 1 FROM dbo.sysobjects where id =
object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY( id, N'IsUserTable')
= 1)
DROP TABLE dbo.Orders_TMP
SELECT * INTO dbo.Orders_TMP FROM Test17.Northwin d.dbo.Orders
END
ELSE -- Local
BEGIN
IF EXISTS (SELECT 1 FROM dbo.sysobjects where id =
object_id(N'[dbo].[Orders_TMP]') and OBJECTPROPERTY( id, N'IsUserTable')
= 1)
DROP TABLE dbo.Orders_TMP
SELECT * INTO dbo.Orders_TMP FROM Northwind.dbo.O rders
-- SELECT 1 FROM dbo.Orders_TMP WHERE 1 = 2 -- Why do I need this line?
END
BEGIN TRANSACTION
Select 'Line 25'
SELECT COUNT(*) FROM dbo.Orders_TMP
COMMIT
GO
PRINT 'This_works'
EXECUTE This_works 0
PRINT ' '
PRINT 'This_does_not'
EXECUTE This_does_not 0
Thanks for any help or hint,
Igor Raytsin 8 1954
Igor Raytsin (ig*****@sympat ico.ca) writes: The following script is reproducing the problem assuming you have Northwind database on the server. Please note it gives you the error message on line 12.
I think I understand what's going on. Since you drop and recreate the
table, the next reference to the table after its recreation will cause
a recompilation of the procedure. If that SELECT is in a transaction, you
have a problem, because SQL Server then wants to talk with the linked server
to verify the table. (Deferred name resolution does not apply to linked
tables.)
--
Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Erland Sommarskog wrote: Igor Raytsin (ig*****@sympat ico.ca) writes:
The following script is reproducing the problem assuming you have Northwind database on the server. Please note it gives you the error message on line 12.
I think I understand what's going on. Since you drop and recreate the table, the next reference to the table after its recreation will cause a recompilation of the procedure. If that SELECT is in a transaction, you have a problem, because SQL Server then wants to talk with the linked server to verify the table. (Deferred name resolution does not apply to linked tables.)
Thank you for your reply Erland,
In other words - those procedures are never got compiled without a error (or warning),
but SQL Server ignores them if it is not in a transaction. Right?
Thanks,
Igor
Igor
In addition
Inside the transaction spesify name of the database and it will work
BEGIN TRANSACTION
Select 'Line 25'
SELECT COUNT(*) FROM Northwind.dbo.O rders_TMP
COMMIT
Perhaps SQL Server verified the new table (SELECT * INTO) by SELECT which
is was remarted in the second example
(Deferred name resolution does not apply to linked tables.)
Erlan, I think it has nothing to do with a linked servers it does a creation
on the local server and not a linked one.
Or if I did not understand you , can you please elaborate the explanation?
"Erland Sommarskog" <es****@sommars kog.se> wrote in message
news:Xn******** ************@12 7.0.0.1... Igor Raytsin (ig*****@sympat ico.ca) writes: The following script is reproducing the problem assuming you have Northwind database on the server. Please note it gives you the error message on line 12. I think I understand what's going on. Since you drop and recreate the table, the next reference to the table after its recreation will cause a recompilation of the procedure. If that SELECT is in a transaction, you have a problem, because SQL Server then wants to talk with the linked
server to verify the table. (Deferred name resolution does not apply to linked tables.) -- Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Uri Dimant (ur**@iscar.co. il) writes: Erlan, I think it has nothing to do with a linked servers it does a creation on the local server and not a linked one. Or if I did not understand you , can you please elaborate the explanation?
It's correct that the actual execution path does not touch the linked
server. However, the procedure is recompiled as a whole, and the procedure
includes a reference to linked table. And when the recompilation occurs
in a transaction, that transaction becomes a distributed transaction,
but this is not handled well.
--
Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Igor Raytsin (ig*****@sympat ico.ca) writes: In other words - those procedures are never got compiled without a error (or warning), but SQL Server ignores them if it is not in a transaction. Right?
This particular error only occurs when you are in a transaction. I can't
really say why, but apparently the fact that the single-machine transaction
suddenly makes a linked reference is not handled well.
--
Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Erland
Ok, I got it, but how do you explain that by adding a name of the database
within a tranasction (which is becamed distributed ) it began to work?
"Erland Sommarskog" <es****@sommars kog.se> wrote in message
news:Xn******** **************@ 127.0.0.1... Uri Dimant (ur**@iscar.co. il) writes: Erlan, I think it has nothing to do with a linked servers it does a creation on the local server and not a linked one. Or if I did not understand you , can you please elaborate the explanation?
It's correct that the actual execution path does not touch the linked server. However, the procedure is recompiled as a whole, and the procedure includes a reference to linked table. And when the recompilation occurs in a transaction, that transaction becomes a distributed transaction, but this is not handled well.
-- Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Uri Dimant wrote:
Uri,
I tried to add the database name -
SELECT COUNT(*) FROM tempdb.dbo.Orde rs_TMP
But it did not work on my server :(
Igor Igor In addition Inside the transaction spesify name of the database and it will work
BEGIN TRANSACTION Select 'Line 25' SELECT COUNT(*) FROM Northwind.dbo.O rders_TMP COMMIT
Perhaps SQL Server verified the new table (SELECT * INTO) by SELECT which is was remarted in the second example
(Deferred name resolution does not apply to linked
tables.)
Erlan, I think it has nothing to do with a linked servers it does a creation on the local server and not a linked one. Or if I did not understand you , can you please elaborate the explanation?
"Erland Sommarskog" <es****@sommars kog.se> wrote in message news:Xn******** ************@12 7.0.0.1...
Igor Raytsin (ig*****@sympat ico.ca) writes:
The following script is reproducing the problem assuming you have Northwind database on the server. Please note it gives you the error message on line 12.
I think I understand what's going on. Since you drop and recreate the table, the next reference to the table after its recreation will cause a recompilation of the procedure. If that SELECT is in a transaction, you have a problem, because SQL Server then wants to talk with the linked
server
to verify the table. (Deferred name resolution does not apply to linked tables.) -- Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp
Uri Dimant (ur**@iscar.co. il) writes: Ok, I got it, but how do you explain that by adding a name of the database within a tranasction (which is becamed distributed ) it began to work?
I got the same error message when I made your replacement. I suspect
that you had inadvertently created an Orders_TMP in the Northwind
database. But Igor's script runs from tempdb. Under this scenario
there is no need for recompilation.
--
Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server SP3 at http://www.microsoft.com/sql/techinf...2000/books.asp This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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