ORA-20000: ORU-10027: buffer overflow, limit of 20000 bytes

Oracle PL/SQL error message: ORA-20000: ORU-10027: buffer overflow, limit of 20000 bytes. This error indicates that a buffer overflow has occurred, and the size of the data being processed has exceeded the predefined limit of 20000 bytes.

Cause:

The stored procedure ‘raise_application_error’ was called which causes this error to be generated.

Let’s break down the error message:

ORA-20000: This is a generic PL/SQL exception. It signifies a user-defined exception with the code 20000. In Oracle, developers often raise user-defined exceptions to handle specific error conditions in their PL/SQL code.

ORU-10027: This is the error code associated with the Oracle utility (ORU) that is reporting the issue. In this case, ORU-10027 indicates a buffer overflow.

Buffer overflow, limit of 20000 bytes: This part of the error message provides information about the nature of the problem. It suggests that a buffer used in the process has become full, and the allowed limit for this buffer is 20000 bytes. A buffer overflow occurs when more data is written to a buffer than it can hold, leading to unpredictable behavior and potentially causing the program to crash.

Solution:

Check in procedure for all strings length. To address this issue, consider the following steps:

Check Data Input: Verify the data being processed to ensure it doesn’t unexpectedly exceed the buffer limit. This may involve validating user inputs, checking data sources, or reviewing the queries that retrieve or manipulate data.

Increase Buffer Size: If the buffer limit is artificially set and can be adjusted, you may consider increasing the size of the buffer. However, this should be done cautiously, as excessively large buffers can impact performance and may not solve the underlying issue.

Implement Error Handling: Enhance error handling mechanisms in your code to gracefully handle situations where the buffer limit is reached. This could involve logging information, notifying administrators, or providing users with informative error messages.

Example:

declare
	v_first_name char(25000);
begin
	SELECT s.first_name into v_first_name 
	FROM students s WHERE s.CITY='New York';
	DBMS_OUTPUT.PUT_LINE('v_first_name: '||v_first_name);
end;

Output: ORA-20000: ORU-10027: buffer overflow, limit of 20000 bytes

Correct:

declare
	v_first_name char(19986);
	--v_first_name varchar2(32000);
begin
	SELECT s.first_name into v_first_name 
	FROM students s WHERE s.CITY='New York';
	DBMS_OUTPUT.PUT_LINE('v_first_name: '||v_first_name);
end;

Output: v_first_name: Daniel

By addressing the issues identified through these steps, you can mitigate the buffer overflow problem and ensure the stable operation of your PL/SQL code within the specified constraints.