Dual contection between SQL Server and Oracle 10g

Hi.
I have the following scenario:
- a MS SQL Server database with some data i'd like to tranfer to an Oracle XE or SE database.
- The idea would be to start a process (possibly on the SQL Server DB) to gather and transform certain data and then, connect to an Oracle Db an insert the data.
I'm good working with Oracle Forms, and i know i can connect to an MS SQL Server using odbc (forms 6i). So obviously, my first choice would be using forms6i to create some text files (using text_io) as a temporary storage and later connect to Oracle DB read and process text files. Another option which i'm not familiar in 6i would be using the EXEC_SQL package.
Apart from this solution, i wonder whether it's possible to create a stored procedure somewhere and have it execute from a deamon or something. This of course depends on the possibility of establish a dual connection between the two DBs.
Thanks in advance ...!

Luis,
The documentation for Generic Connectivity is here:
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14232/gencon.htm#sthref343
But it is pretty confusing. There is a nice easy and complete example here: http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:4406709207206#18830681837358
It shows a connection to MS Excel, but connecting to SQL Server is the same - just use a different ODBC driver.
Doug

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NVARCHAR - NVARCHAR2 datatype mapping between sql server and oracle.

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The migration tool has converted NVARCHAR columns to be twice their size as NVARCH2 in Oracle. Example, a table whose column is mycol NVARCHAR(40) gets migrated as mycol NVARCHAR2(80).
In SQL Server land, the designation of a column as NVARCHAR(40) will physically store the column as 80 bytes. However, as I understand from this excerpt (taken from here: http://www.oracle.com/technology/oramag/oracle/03-nov/o63tech_glob.html), that Oracle in essence will do the same thing for NVARCHAR2:
To make it easy to allocate proper storage for Unicode values, Oracle9i Database introduced character semantics. You can now use a declaration such as VARCHAR2(3 CHAR), and Oracle will set aside the correct number of bytes to accommodate three characters in the underlying character set. In the case of AL32UTF8, Oracle will allocate 12 bytes, because the maximum length of a UTF-8 character encoding is four bytes (3 characters * 4 bytes/character = 12 bytes). On the other hand, if you're using AL16UTF16, in which case your declaration would be NVARCHAR2(3), Oracle allocates just six bytes (3 characters * 2 bytes/character = 6 bytes). One difference worth noting is that for UTF-8, a declaration using character semantics allows enough room for surrogate characters, whereas for UTF-16 that is not the case. A declaration such as NVARCHAR2(3) provides room for three UTF-16 code units, but a single supplementary character may consume two of those code units.
As I read this, NVARCHAR(40) in sql server should be equivalent to NVARCHAR2(40) in Oracle and not NVARCHAR2(80) as it gets translated to - am I missing something? We have a rather large database to migrate so I need to get this size allocation right (and I obviously don't want to truncate any data).
Thanks -

Right - well, that's what I'm suggesting is that NVARCHAR(8) in SQL Server is equivalent to NVARCHAR2(8) in Oracle. Truncation will occur after 8 of any character, including, say, double byte Kanjii characters, which would physically store 16 bytes in the NVARCHAR(8) NVARCHAR2(8) column defn. I tried that in both SQL Server and Oracle, and the behavior is the same.
Also, technically, NVARCHAR2(8) and VARCHAR2(8 CHAR) is roughly the same in terms of behavior, except that in the first case, the physical storage is 16 bytes, while in the second case, it's 24 bytes (to account for 'supplemental' characters or true UTF-8 compliance). Same truncation occurs after 8 of -any- character be it single byte ascii or double byte kanjii, which is the behavior I expect.
Thanks for looking into this. What I decided to do was the following:
What was originally defined in SQL Server as varchar (and translated to VARCHAR2 with the CHAR designation), I removed the CHAR designation since I truly want that number of bytes to be stored, and not characters (for columns I do not care about UTF8 or 16 compliance - that will also mimic the same behavior I currently have on the SQL Server side. For anything that was nvarchar in SQL Server, I went ahead and created them as VARCHAR2 with the CHAR designation, with the same size (not double the value as was in SQL Server which the documentation says it gets translated to). I did this since we probably will need true UTF-8 compliance down the line, and since I had the hood open, it was easy enough to do. I could also have converted NVARCHAR(n) to NVARCHAR2(n) (and not n*2) as what was happening in the migration.
I tested strings in both cases, and I think I have my solution.
Edited by: kpw on Sep 24, 2008 11:21 AM

Migration from MS SQL Server to Oracle 10g

Hi,
In our application, we are planning to refresh data every one hour from MS SQL Server to Oracle 10g. Can anyone tell me what approach can be followed?
Thanks & Regards,
Faizal MK

Hello,
migrations can be done with the Migration Workbench that is included in the SQL Developer: http://www.oracle.com/technology/tech/migration//workbench/index_sqldev_omwb.html
But your question sounds more like a replication of data than a migration. Please read as a starter the following note in My Oracle Support (former Metalink):
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Compare SQL Server and Oracle syntax

Hello, I am very new to the Oracle DB as I have been working with MS SQL Server for many years. I have a SQL statement that works fine in MSSQL but seems to not work in Oracle. Is this a syntax problem or do I need to look elsewhere?
DECLARE @as_master_key varchar(26)
EXEC [dbo].[GET_UNIQUE_MASTER_KEY]
     @as_project_name = N'CMDEMO',
     @as_database_site = N'CMPL',
     @as_user_initials = N'SK',
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     @as_master_key =
     @as_master_key
OUTPUT SELECT @as_master_key as N'master_key'
This is what I use in MSSQL and it works fine - but I am porting this application to an Oracle backend and it fails. Any suggestions?
Thanks in advance to this newbie. :)

SQL Server and Oracle are two completely different RDBMS'.
You'd be best not to try and port SQL Server code to Oracle SQL or PL/SQL directly as it will not favour the power of Oracle's features correctly.
I'm not sure what your code is supposed to be doing (I find SQL Server code awful to read, and never understand the need for "@" before variable names, that just seems to show a lazy parser (or lazy coder who designed the parser)).
From what I can guess it's going to be something like...
SQL code...
create or replace sequence my_master_key;PL/SQL code...
DECLARE
as_master_key number;
as_project_name varchar2(20) := 'CMDEMO';
as_database_site varchar2(20) := 'CMPL';
as_user_initials varckar2(5) := 'SK';
as_table varchar2(30) := 'SUBMITTAL_CATEGORY';
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select my_master_key.nextval
into as_master_key
from dual;
-- In 11g you could replace this select with just:
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Different output of same query in SQL Server and Oracle

I have two tables table1 and table2
--table1 has two columns c1 int and c2 varchar. there are not constraints added in it. it has data as given below
c1     c2
6     d
5     j
102     g
4     g
103     f
3     h
501     j
1     g
601     n
2     m
--table2 has only one column c1 int. there are not constraints added in it. it has data as given below
c1
6
1
4
3
2
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select *
from table1
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sql server output
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oracle output
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4 g 4
3 h 3
1 g 1
2 m 2
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Even SQL Server won't guarentee to always get your data in an ordered fashion if you exclude the order by clause, even if you think it has always output the data in an ordered fashion.
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answered

DSNless connection to SQL Server and Oracle

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zulfgi

My favorite reply again:
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Hi,
We have a very time sensitive pressing requirements to be addressed immediately.
We need to read the date time column from sql server 2008 into oracle 10g.
We have a dblink established between the two servers and have tried to use sql server and sql native client 10 driver to read the dates from sql into oracle.This we are able to do very successfully.
The issue is in reading milliseconds stored in sql server.The millisecond part comes in as 00000 from sqlserver to oracle.These milliseconds are needed to identlfy the unique records.
For instance
SQL SERVER Oracle
source_id source id
01/01/2012 6:30:35:456 01/01/2012 6:30:35:000000.
Im issuing my query through Toad via Oracle to remote sql server using a dblink which connects using HS ODBC connection to sql server 2008(remote).
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Any insight or help will be much appreciated.

Hi,
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- from Oracle could you issue -
describe sql_server_table@hsodbc
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Regards,
Mike

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Hi,
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Hi Chocobo,
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table@microsoftSQLServer m
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How would one go about doing such a thing?
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Hi Matt and Thomas
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Yes I have to do the join. Even worse I have to write an Aggregate query like this!
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I have to device a way to harvest both systems as they are. I don't want to move around data. I thought looking at Oracle BI I could write SQL against multiple Data Sources. I am struggling to find a way. As it seems that it can "SQL query" 1 data source at a time.
I have been hinted on another forum (OracleTURK) to use Oracle Transparent Gateways and Generic Connectivity. http://download.oracle.com/docs/cd/B19306_01/server.102/b14232/toc.htm
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Have you tried Migration work bench?

Dual contection between SQL Server and Oracle 10g

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