How to Troubleshoot ORA-12560: TNS:protocol adapter error?

Resolving the ORA-12560: TNS:protocol adapter error in Oracle

The "ORA-12560: TNS:protocol adapter error" is a frequent problem when connecting to an Oracle database. This error usually indicates a problem with the database service or the client's inability to connect to the server.

Resolution Steps

Here's how to troubleshoot and fix this error:

1. Ensure the Oracle Database Service is Running:

   • Access the Windows Services console (Start > Run > Services.msc).
   • Locate the "OracleService " service (e.g., OracleServiceORCL). If it's not running, right-click and select "Start".

2. Check Network Connectivity:

   • Open a command prompt on your client machine.

   • Use the tnsping command to test connectivity:

     <code class="language-bash">tnsping <tnsalias></code>

     Replace <tnsalias> with your TNS alias from the tnsnames.ora file. A successful tnsping confirms network connectivity; failure suggests issues with firewalls or listener configuration.

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