How to solve Oracle Database Error 3121 (ora-03121)

Oracle Error Code
   ora-03121

Description
   no interface driver connected - function not performed

Cause
   This message occurs usually because the Net8 driver is not loaded into memory or there is a mismatch of the version of the driver. A user program linked with an obsolete library may also cause this message. Only programs provided by Oracle Corporation should use this interface.
How to Solve
   If the message occurred during use of a program provided by Oracle Corporation, contact Oracle Support Services. If a user program caused the message, relink the program with current versions of the Oracle libraries.

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  ORA-03100    ORA-03105    ORA-03106    ORA-03121    ORA-03122    ORA-03123    ORA-03124  Others

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