How to connect another database

I have installed ORACLE 10g database express edition and want to connect to another oracle 8i database, that have installed at server how to connect.

One way is add a TNS alias to your tnsnames.ora file, like this stanza:
EXAMPLE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = SAMPHOST.mydomain.com)(PORT = 1521))
(CONNECT_DATA =
(SID = SAMPLSID)
(SERVER = DEDICATED)
So in sqlplus ...
SQL> connect username/passwd@example
will connect you to the database with ORACLE_SID -> SAMPLSID via port 1521 at samphost using a dedicated server connection.

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Hi Experts,
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tmadugula wrote:
Hi Experts,
i am using oracle 10g (10.2),linux4.6 .my databae server contain multiple databases how can connect one database to another database and how can i put this all environment variable in single parameter fileYou can see from the responses two very different sets of advice. To know what applies to your situation, you need to clarify what you need to do.
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How to connect another database

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