ORA-06550: line n column m

The ORA-06550: line n column m error happens as part of another exception stack, which displays the line and column numbers where the error happened in the oracle PL/SQL code. The exception to this is not caused by the error. A stack of unhandled exceptions in the PLSQL code causes this error. This error ORA-06550: line n column m shows the line and column numbers where the error occurred

Oracle will show all potential errors if an error happens. Oracle will throw a few more exceptions than errors. When the error’s underlying cause is corrected, all of the errors can be resolved as well. The root cause of the error should be found and corrected in order to resolve it. There are two options for addressing the problem. The code bug must be fixed or the exception should be handled to resolve this error ORA-06550: line n column m .

The error message would show the line and column number where the ORA-06550: line n column m error happened. The root cause was identified by looking at the code on the line number. It’s possible that the error’s root cause does not appear on the specified line number. The line number where the error happened is shown in this error. The root cause of the error could be across the line number.



ORA-06550 Exception

The actual error is PLS-00201: identifier ‘EMPNAME’ must be declared. As a part of the PLS-00201 error, the ORA-06550: line n column m error is shown as a backtrace message as the error stack is being unwound by unhandled exceptions.

The actual error PLS-00201 is shown as the second line in the stack trace below. The stack trace illustrates the ORA-06550 error. Line number 3 is shown in this error. Line 3 and column 26 are the places where the error occurs. The error will be corrected by looking at the code at the line where the error occurs.

declare
begin
    dbms_output.put_line(empname);
end;
Error report -
ORA-06550: line 3, column 26:
PLS-00201: identifier 'EMPNAME' must be declared
ORA-06550: line 3, column 5:
PL/SQL: Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"


Problem

This error can be seen if you create simple code that throws an exception and does not handle the exception. Create an exception with some basic PL/SQL code. The trace of the error stack would be created by the exception. The error stack trace would contain this error. The error would show the line number where the exception was thrown.

The error would be thrown if you run the example below. In the PL/SQL code, the empname variable is not declared. However, the database output function uses the variable empname.  Oracle was unable to locate the variable to print In the console pane.

declare
begin
    dbms_output.put_line(empname);
end;


Cause

Usually a PL/SQL compilation error.

The ORA-06550: line n column m error is shown as a backtrace message as the error stack is being unwound by unhandled exceptions. In the stack trace, the actual error will be shown alongside this error.



Action

The oracle error will be reflected in the error stack trace. The debugging should begin on the line where the error occurred. This error will show the line number. The error’s root cause should be identified and fixed in the code.



Solution 1

This exception does not have a solution. As a trace of the error message, this error is returned. Along with the error, the error’s root cause would be shown. The error’s root cause must be identified and corrected. The line number where the exception happened is shown in the error. It’s probable that the error’s root cause isn’t in the line where the exception happened.

If the actual error PLS-00201: identifier ‘EMPNAME’ must be declared is fixed in the code, the ORA-06550: line n column m will be resolved as well. The assigning of a string value to a numeric data type variable is considered an error. The value of the string would be assigned to the variable if the variable data type is changed to varchar.

declare
    empname varchar2(10) :='yawin';
begin
    dbms_output.put_line(empname);
end;

Output

yawin
PL/SQL procedure successfully completed.


Solution 2

The error may also be handled using the exception handling method. The exception block will be executed and will take a different path when the actual exception is thrown in the code. In the runtime, the exception would be avoided.

The data passed through the application is the cause of this error. If this is an unusual error, modifying the data type can result to a number of code changes. The exception can be handled instead of fixing the code to handle the value of the character string to be saved in the numeric data type.

declare
begin
    dbms_output.put_line(empname);
exception
    WHEN OTHERS THEN
        empname :='yawin';
end;

Output

yawin
PL/SQL procedure successfully completed.



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