Oracle Linked Servers

I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
Server 2000. Linking seems to work well. Then I fire off a few queries via
Query Analyzer at a table with ~3000 rows of data, and get the following
responses . . .
select top 1000 * from table - executes in 1 second
select top 2000 * from table - executes in 1 second
select top 3000 * from table - executes in 1 second
select top 4000 * from table - runs for > 5 minutes
select * from table - runs for > 5 minutes
Some additional comments on my setup -
1. I created a blank database in sql server
2. I created a set of views in sql server, one view for each table in
oracle, with a "select * from [oracle table]" for each view (acutally used
correct syntax to pull oracle data - above select is hypothetical ;-)
3. I have a few reporting views in sql server that aggregate base views; but
that is the extent of view nesting, 2 deep
Any comments? I was originally wanting to write things off to RAM, but I'm
wondering if there are issues with the ODBC / translation of the termination
of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
databases. When I try the Oracle OLE DB Provider, the tables show up in the
linked server but any Query Analyzer queries agains them error out with the
following:
Server: Msg 7320, Level 16, State 2, Line 2
Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle' ICommandText::Execute
returned 0x80040155].
Thanks for any help.
-craig
To use distributed transactions with the Oracle OLE DB Provider in your
environment you'll need to install the Oracle Service for MTS.
Michael D. Long
Microsoft MVP - Windows SDK
"Craig" <anonymous@.microsoft.com> wrote in message
news:e4p3OsDkEHA.3968@.TK2MSFTNGP11.phx.gbl...
> I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
> Server 2000. Linking seems to work well. Then I fire off a few queries
via
> Query Analyzer at a table with ~3000 rows of data, and get the following
> responses . . .
> select top 1000 * from table - executes in 1 second
> select top 2000 * from table - executes in 1 second
> select top 3000 * from table - executes in 1 second
> select top 4000 * from table - runs for > 5 minutes
> select * from table - runs for > 5 minutes
> Some additional comments on my setup -
> 1. I created a blank database in sql server
> 2. I created a set of views in sql server, one view for each table in
> oracle, with a "select * from [oracle table]" for each view (acutally used
> correct syntax to pull oracle data - above select is hypothetical ;-)
> 3. I have a few reporting views in sql server that aggregate base views;
but
> that is the extent of view nesting, 2 deep
> Any comments? I was originally wanting to write things off to RAM, but
I'm
> wondering if there are issues with the ODBC / translation of the
termination
> of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
> databases. When I try the Oracle OLE DB Provider, the tables show up in
the
> linked server but any Query Analyzer queries agains them error out with
the
> following:
> Server: Msg 7320, Level 16, State 2, Line 2
> Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
> OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle'
ICommandText::Execute
> returned 0x80040155].
> Thanks for any help.
> -craig
>

Oracle Linked Servers

I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
Server 2000. Linking seems to work well. Then I fire off a few queries via
Query Analyzer at a table with ~3000 rows of data, and get the following
responses . . .
select top 1000 * from table - executes in 1 second
select top 2000 * from table - executes in 1 second
select top 3000 * from table - executes in 1 second
select top 4000 * from table - runs for > 5 minutes
select * from table - runs for > 5 minutes
Some additional comments on my setup -
1. I created a blank database in sql server
2. I created a set of views in sql server, one view for each table in
oracle, with a "select * from [oracle table]" for each view (acutally us
ed
correct syntax to pull oracle data - above select is hypothetical ;-)
3. I have a few reporting views in sql server that aggregate base views; but
that is the extent of view nesting, 2 deep
Any comments? I was originally wanting to write things off to RAM, but I'm
wondering if there are issues with the ODBC / translation of the termination
of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
databases. When I try the Oracle OLE DB Provider, the tables show up in the
linked server but any Query Analyzer queries agains them error out with the
following:
Server: Msg 7320, Level 16, State 2, Line 2
Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle' ICommandText::Exec
ute
returned 0x80040155].
Thanks for any help.
-craigTo use distributed transactions with the Oracle OLE DB Provider in your
environment you'll need to install the Oracle Service for MTS.
Michael D. Long
Microsoft MVP - Windows SDK
"Craig" <anonymous@.microsoft.com> wrote in message
news:e4p3OsDkEHA.3968@.TK2MSFTNGP11.phx.gbl...
> I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
> Server 2000. Linking seems to work well. Then I fire off a few queries
via
> Query Analyzer at a table with ~3000 rows of data, and get the following
> responses . . .
> select top 1000 * from table - executes in 1 second
> select top 2000 * from table - executes in 1 second
> select top 3000 * from table - executes in 1 second
> select top 4000 * from table - runs for > 5 minutes
> select * from table - runs for > 5 minutes
> Some additional comments on my setup -
> 1. I created a blank database in sql server
> 2. I created a set of views in sql server, one view for each table in
> oracle, with a "select * from [oracle table]" for each view (acutally
used
> correct syntax to pull oracle data - above select is hypothetical ;-)
> 3. I have a few reporting views in sql server that aggregate base views;
but
> that is the extent of view nesting, 2 deep
> Any comments? I was originally wanting to write things off to RAM, but
I'm
> wondering if there are issues with the ODBC / translation of the
termination
> of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
> databases. When I try the Oracle OLE DB Provider, the tables show up in
the
> linked server but any Query Analyzer queries agains them error out with
the
> following:
> Server: Msg 7320, Level 16, State 2, Line 2
> Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
> OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle'
ICommandText::Execute
> returned 0x80040155].
> Thanks for any help.
> -craig
>

Oracle Linked Servers

I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
Server 2000. Linking seems to work well. Then I fire off a few queries via
Query Analyzer at a table with ~3000 rows of data, and get the following
responses . . .
select top 1000 * from table - executes in 1 second
select top 2000 * from table - executes in 1 second
select top 3000 * from table - executes in 1 second
select top 4000 * from table - runs for > 5 minutes
select * from table - runs for > 5 minutes
Some additional comments on my setup -
1. I created a blank database in sql server
2. I created a set of views in sql server, one view for each table in
oracle, with a "select * from [oracle table]" for each view (acutally used
correct syntax to pull oracle data - above select is hypothetical ;-)
3. I have a few reporting views in sql server that aggregate base views; but
that is the extent of view nesting, 2 deep
Any comments? I was originally wanting to write things off to RAM, but I'm
wondering if there are issues with the ODBC / translation of the termination
of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
databases. When I try the Oracle OLE DB Provider, the tables show up in the
linked server but any Query Analyzer queries agains them error out with the
following:
Server: Msg 7320, Level 16, State 2, Line 2
Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle' ICommandText::Execute
returned 0x80040155].
Thanks for any help.
-craigTo use distributed transactions with the Oracle OLE DB Provider in your
environment you'll need to install the Oracle Service for MTS.
--
Michael D. Long
Microsoft MVP - Windows SDK
"Craig" <anonymous@.microsoft.com> wrote in message
news:e4p3OsDkEHA.3968@.TK2MSFTNGP11.phx.gbl...
> I've got an Oralce 8i db that I'm running as a Linked Server inside SQL
> Server 2000. Linking seems to work well. Then I fire off a few queries
via
> Query Analyzer at a table with ~3000 rows of data, and get the following
> responses . . .
> select top 1000 * from table - executes in 1 second
> select top 2000 * from table - executes in 1 second
> select top 3000 * from table - executes in 1 second
> select top 4000 * from table - runs for > 5 minutes
> select * from table - runs for > 5 minutes
> Some additional comments on my setup -
> 1. I created a blank database in sql server
> 2. I created a set of views in sql server, one view for each table in
> oracle, with a "select * from [oracle table]" for each view (acutally used
> correct syntax to pull oracle data - above select is hypothetical ;-)
> 3. I have a few reporting views in sql server that aggregate base views;
but
> that is the extent of view nesting, 2 deep
> Any comments? I was originally wanting to write things off to RAM, but
I'm
> wondering if there are issues with the ODBC / translation of the
termination
> of data. I'm using the Microsoft OLE DB Provider for Oracle to link the
> databases. When I try the Oracle OLE DB Provider, the tables show up in
the
> linked server but any Query Analyzer queries agains them error out with
the
> following:
> Server: Msg 7320, Level 16, State 2, Line 2
> Could not execute query against OLE DB provider 'OraOLEDB.Oracle'.
> OLE DB error trace [OLE/DB Provider 'OraOLEDB.Oracle'
ICommandText::Execute
> returned 0x80040155].
> Thanks for any help.
> -craig
>

ORACLE Linked DB

I'm playing around with Linked Servers in SQL Server 2K and when linking to an Oracle Database I'm having very slow response time. If I just query the whole table with out a WHERE statement, it seems to go at a decent rate. If I include any parameters whatsoever, it goes horribly slow. I have used the four part name scenraio and the openquery scenerio. Also I get Date errors occasionally which could probably be corrected if I change the format of the date. Any ideas why the linked server acts so slow? If I use a DTS extract I can query the database any way I want and it runs fine. But I cannot do this because so much data changes in these particular tables in the Oracle DB that I need a live connection.1) ------------------
For your date problem, I sympathize !

I've got about the same date problem (format is not the same in both of my Databases)
I've decided to use varchar(26) types in my SQL Server db.
You should consult my threads fore more info on the dates
maybe it will give ideas !

2) ------------------
For the perfs problem maybe it's due to :
- no indexes on the "where columns"
- too much transformations to do on all the date columns
- not using pre-compiled queries

You should post your query so we can see it