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ORACLE : Io exception: The Network Adapter could not establish the connection

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Not connecting to correct Database in oracle :


jdbc:oracle:thin:@<server_host>:1521:<instance_name>

 the following commands will help:

 1. Oracle query command to check the SID (or instance name):

 select sys_context('userenv','instance_name') from dual; 
2. Oracle query command to check database name (or server host):

 select sys_context('userenv', 'server_host') from dual;
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