Server Aliases/linked Servers Cause Remote Queries

Apr 4, 2008

Can someone please shed some light on what seems to me to be a common requirement.

If I create an alias or linked server to Server1 - say Alias1 - on Server1 and then use that name in a query on Server1, a remote/distributed query is always used (even though we are running on the local server and that overhead is completely unnecessary).

Is SQL Server really not capable of deciding that
select * from Alias1.db1.dbo.table1
and
select * from Server1.db1.dbo.table1
should be optimized and executed exactly the same when Alias1 is Server1, but that it is a distributed query ONLY when Alias1 is really referring to a remote server? I realize that the four part name is not necessary when I am referring to objects on the current server, but I am trying to write code that is server instance independent.

It just seems that if that is not possible, then the only way to create system independent stored procs that can run in dev, staging, and production environments and work with multiple databases on multiple servers is to create all sorts of scripts to regenerate all the procs whenever you move a database between servers?

If SQL Server is even close to the enterprise big iron server that MS now claims it is, it surely needs to support running in dev, staging, and production environments and work with multiple databases on multiple servers?!

I'm really looking for someone to tell me I'm missing something simple, and of course you can do this - but complex workarounds are invited too :-)
This is not something I am investigating as an academic exercise, I am already doing this, but I have to figure out how to do it better because with all these unnecessary distributed queries, performance is horrible.

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Oct 25, 2000

Hi Everybody,

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Nov 14, 2007

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Feb 6, 2002

Hi there,
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May 15, 2008

Ok, this is a little convoluted so bear with me.

I have a SQL 2000 SP4 box on Windows 2000 Server with the Oracle 11g Client installed.

I've created a linked server to an Oracle database that lives offsite (sites connected with a fairly high speed VPN link).

There's a view on the Oracle database I'm trying to access through the linked server using the four-part naming convention*.

If I execute a fairly simple query against that view, the query runs until it eventually times out two hours later. And by simple, I mean something like this:


select * from CGN_LMS..CGNLMS.V_PRODUCTION_SUM where FISCAL_PERIOD = 200803

That happens if I use the OLE DB provider from Oracle or the one from MS.

Now, if I run the same type of query against that Oracle DB from Excel or Access (using the ODBC driver), the query will complete in seconds, returning about 800 rows of data.

For fun, I created a blank Access database with one linked table that points to that V_PRODUCTION_SUM view on the Oracle database, and one Query within that Access database that SELECTs * FROM the linked table WHERE FISCAL_PERIOD=200803.

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So I guess my question is... WTF?

How is it that this:


SQL 2000 ->OLE DB provider-> Oracle

Times out after 2 hours, while this:


SQL 2000 -> Jet driver-> Access -> ODBC driver -> Oracle

returns all my results in seconds/minutes?

Couple other side notes...

A lot of the queries that I test with using this linked server work just fine. In fact, with this particular query, if I were to just pull SELECT TOP 800 * with no WHERE clause, the query would run rather quickly (like in 4 seconds).

Also, if I use OpenQuery instead of the 4-part linked server name, the queries return results as quickly as I'd hope. That might work as a last resort, but we have existing applications that use the 4-part names already and we'd rather not have to suss out and change all those if we don't have to.




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Mar 13, 2008


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Sep 15, 2015

Below is the syntax I am using for creating Linked server from SQL Server i.e windows 2008 R2 standard to Postresql database running on Linux 32 bit Debian (Linux turtle 3.2.0-4-686-pae #1 SMP Debian 3.2.46-1+deb7u1 i686 GNU/Linux) and the version of Postresql is 8.3

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How to setup the linked server........... Below are the drivers installed on the SQL server

PostgreSQL35W
PostgreSQL30

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I have an ODBC connection (System DSN) configured for an Informix ODBC driver.
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---

Msg 7399, Level 16, State 1, Line 1

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---

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Nov 14, 2007

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Errors:

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Msg 7303, Level 16, State 1, Line 1
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Hi guys,

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i did "Linked server" between To Servers , and it's Working.

---------------------------



For Example :

Server 1 =S1.

Server = S2.

i create table in S1 : name = TblS1

i create same table in S2 : name TblS2



and i create trigger(name tr_cpD) From S1 in TblS1 For send data To TblS2 in S2

/****************** trigger Code ***************

CREATE TRIGGER dbo.tr_cpD

ON dbo.TblS1

AFTER INSERT

AS


BEGIN





SET NOCOUNT ON;


insert into [S2].[dbname].[dbo].[TblS2] Select ID,Name from insertedEND

**************************************************



result is :

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how i can execute this trigger



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