Connect to Oracle without Oracle Client in Windows?

Hi All,
Is there anyway to connect to Oracle DB without any installation of Oracle Product in Client?
I am using MS ODBC Driver Oracle but It need the "Data Source Name"
It seems that client machine do need to Setup the NET 8 Configure / Tnsname.ora
I can try to set any thing in Oracle Server, But want to minimize the effort doing on the client (Because there are many!).
I am using Visual Basic, WIN XP as client Platform. WIN 2K as Oracle DB Server.
Can anybody give me a hand. Thank you very much!
Eric Yuen

You'll need to install Oracle Client in the client machine. ODBC (or other) connections need OCI and Oracle Net layers.
The Oracle ODBC has a lot of dependencies, probably a thousand files. Unfortunately Client is pretty heavy... managewize also. So that's why you should develop "internet apps". :)

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user13144834 wrote:
Hi All,
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$> sqlplus scott/tiger@larrytns will look in your tnsnames.ora for an entry called 'larry'. Next, tns sends a request to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
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First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't find your telephone directory (tnsnames.ora) or can't find the party you are looking for listed in it (no entry for larry)) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
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Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
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check executing instances to get the SID
[oracle@vmlnx01 ~]$ ps -ef|rgrep pmon
oracle    4236     1 0 10:30 ?        00:00:00 ora_pmon_vlnxora1
oracle    4878 4854 0 10:42 pts/0    00:00:00 grep pmonset ORACLE_SID appropriately, and connect
[oracle@vmlnx01 ~]$ export ORACLE_SID='vlnxora1
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:37 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsNow set ORACLE_SID to a bogus value, and try to connect
SQL> exit
[oracle@vmlnx01 ~]$ export ORACLE_SID=FUBAR
[oracle@vmlnx01 ~]$ SQLPsqlplus scott/tigere
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:57 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
Enter user-name: Now set ORACLE_SID to null, and try to connect
[oracle@vmlnx01 ~]$ export ORACLE_SID=
[oracle@vmlnx01 ~]$ SQLsqlplus /scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:43:24 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
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