The following is the ORA-21520 error message, you can learn the cause and solution of the Oracle database error.

ORA-21520 database server driver not installed

Cause: User attempted to access a database server through an object-mode OCI environment but the necessary driver for supporting such access to the database server is not installed or linked in.

Solution: Check if the driver corresponding to the database server has been installed/linked in and entered in the server driver table.


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