The ORA-06512 error is a common yet critical issue encountered in Oracle PL/SQL programming. This error message essentially serves as a pointer, indicating the line number in the code where an unhandled exception has occurred. It’s part of a larger error stack that helps developers trace the source of the problem and, consequently, fix it. Understanding and resolving ORA-06512 errors is fundamental to maintaining the integrity and functionality of database systems built on Oracle technologies.

Key Takeaways:
  • ORA-06512 is an error pointer in Oracle PL/SQL programming, indicating the line of code where an unhandled exception has occurred.
  • A thorough understanding and resolution of ORA-06512 errors are essential for the optimal performance of Oracle database systems.

Introduction to ORA-06512 Error

Definition and Significance of ORA-06512 Error

The ORA-06512 error is synonymous with Oracle PL/SQL programming. It’s a part of the Oracle error stack that gets generated whenever there’s an unhandled exception in the code. The key characteristic of this error is that it points out the exact line in the code where the exception has occurred, thereby serving as a useful debugging tool for developers.

Common Scenarios Leading to ORA-06512

The error message usually appears as part of a message stack, providing a trail for developers to follow and find the root cause of the issue. It’s crucial for Oracle PL/SQL developers to understand the circumstances under which this error occurs to prevent it from happening and to resolve it when it does occur.

Internal Resources:

Causes of ORA-06512 Error

ora-06512 Errors

Delving into the common causes of the ORA-06512 error aids in a better understanding and quicker resolution. Some of these causes include:

  • Syntax Errors: Syntax errors in the code can trigger exceptions leading to the ORA-06512 error.
  • Runtime Errors: Errors that occur during the execution of the program.
  • Logical Errors: Errors in the logic of the code can also lead to unhandled exceptions.

By analyzing the error stack, developers can trace back to the source of the error, understand what went wrong, and take corrective measures.

Diagnosing the ORA-06512 Error

ORA-06512 error message

Identifying the Line Number

The line number provided by the ORA-06512 error is the starting point for diagnosing the problem. It tells developers exactly where to look in the code to find the unhandled exception.

Reading the Error Stack

The error stack is a collection of error messages that provide a trail to follow, leading back to the source of the error. Understanding how to read the error stack is crucial for diagnosing and resolving the ORA-06512 error.

Internal Resources:

Resolving the ORA-06512 Error

Common Solutions

The ORA-06512 error is resolvable by addressing the unhandled exception that triggered it. Some common solutions include:

  • Fixing Syntax Errors: Correcting syntax errors in the code.
  • Handling Exceptions: Including exception handling blocks in the code to catch and handle exceptions.
  • Correcting Logical Errors: Fixing errors in the logic of the code.

Understanding the error and taking corrective measures is the path to resolving the ORA-06512 error and ensuring the smooth operation of Oracle database systems.

Preventing the ORA-06512 Error

Best Practices in PL/SQL Coding

Preventing the ORA-06512 error largely hinges on adhering to best practices in PL/SQL coding. Here are some preventive measures:

  • Exception Handling: Incorporate exception handling blocks to catch and handle exceptions.
  • Data Validation: Ensure data validation to prevent incompatible data type assignments.
  • Code Review: Regular code reviews to identify and fix potential issues that could lead to errors.

Adhering to these best practices not only prevents ORA-06512 errors but also contributes to the overall robustness and reliability of the database system.

Internal Resources:

Advanced Troubleshooting

ORA-06512 error

Utilizing Oracle Tools

Oracle provides a suite of advanced tools that can be employed for troubleshooting the ORA-06512 error. These tools offer deeper insights into the database operations and help in identifying the root cause of the error.

  • Oracle Debugger: Allows for step-by-step execution of code to identify where the error occurs.
  • Error Log: The error log provides a detailed record of all errors that occur, including ORA-06512.
  • Trace Files: Trace files provide a detailed execution path, aiding in identifying the source of the error.

Leveraging these tools significantly aids in diagnosing and resolving ORA-06512 errors.

Case Studies

Real-world case studies provide a practical perspective on the occurrence and resolution of ORA-06512 errors in Oracle PL/SQL programming environments. By examining actual scenarios, readers can better understand the steps involved in diagnosing and resolving this common error.

Case Study 1: Unexpected Data Type Error


In a financial services firm, a PL/SQL program was developed to automate the calculation of monthly interest for all active accounts. However, upon deployment, the program threw an ORA-06512 error.


Upon reviewing the error stack, it was found that the error was triggered at a line where the program was attempting to divide a number by a string, an operation that is not allowed due to incompatible data types.


The developers corrected the data type of the variable involved, changing it from a string to a number. They also added an exception handling block to catch and handle any future data type errors, thus preventing the ORA-06512 error from occurring again.

Case Study 2: Missing Exception Handling


In a retail management system, a PL/SQL program was written to update inventory levels. However, when an item’s stock level fell below a critical threshold, the program failed with an ORA-06512 error.


The error stack pointed to a line of code where an exception was raised due to the stock level falling below the critical threshold. However, there was no exception handling block to catch and handle this exception, leading to the ORA-06512 error.


Developers added an exception handling block to catch the exception and send an alert to the inventory manager whenever the stock level of an item falls below the critical threshold. This not only resolved the ORA-06512 error but also improved the inventory management process by providing timely alerts.

Frequently Asked Questions (FAQs)

What is the ORA-06512 error and why is it significant?

The ORA-06512 error is an error message in Oracle PL/SQL that indicates the line number where an unhandled exception has occurred, aiding in debugging and resolution.

How can the ORA-06512 error be resolved?

The ORA-06512 error can be resolved by addressing the unhandled exception that triggered it. Common solutions include fixing syntax errors, handling exceptions, and correcting logical errors in the code.

What are the common causes of the ORA-06512 error?

Common causes of the ORA-06512 error include syntax errors, runtime errors, and logical errors in the code.

How can the ORA-06512 error be prevented?

The ORA-06512 error can be prevented by adhering to best practices in PL/SQL coding, such as incorporating exception handling blocks, ensuring data validation, and conducting regular code reviews.

What tools are available for diagnosing the ORA-06512 error?

Tools like the Oracle Debugger, Error Log, and Trace Files can be utilized for diagnosing the ORA-06512 error.

5/5 - (7 votes)

Pin It on Pinterest

Share This